{"id":8178,"date":"2025-07-17T14:26:56","date_gmt":"2025-07-17T06:26:56","guid":{"rendered":"https:\/\/princefastener.com\/?p=8178"},"modified":"2025-07-17T15:26:15","modified_gmt":"2025-07-17T07:26:15","slug":"8-screw-diameter","status":"publish","type":"post","link":"https:\/\/princefastener.com\/ja\/8-screw-diameter\/","title":{"rendered":"Explaining #8 Screw Diameter and Its Common Applications"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"8178\" class=\"elementor elementor-8178\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3809127 elementor-section-boxed ang-section-padding-initial elementor-section-height-default elementor-section-height-default elementor-repeater-item-none elementor-repeater-item-none_hover\" data-id=\"3809127\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c25f541 elementor-repeater-item-none elementor-repeater-item-none_hover\" data-id=\"c25f541\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a32f710 elementor-repeater-item-none elementor-repeater-item-none_hover elementor-widget elementor-widget-text-editor\" data-id=\"a32f710\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"scrolling-article-view\" data-v-cac51986=\"\"><h1 data-v-cac51986=\"\"><img decoding=\"async\" style=\"font-size: 16px;\" src=\"https:\/\/statics.mylandingpages.co\/static\/aaanxdmf26c522mpaaaeerwr4pxy2i7u\/image\/f98f6329ee824910971beba7b9b7c0ef.webp\" alt=\"Explaining #8 Screw Diameter and Its Common Applications\" \/><\/h1><\/div><div id=\"scrolling-view\" class=\"scrolling-article-view\" data-v-cac51986=\"\"><p>You might see #8 screws in lots of projects. The exact size is very important. The #8 screw diameter is\u00a0<a href=\"https:\/\/us.misumi-ec.com\/blog\/machine-screw-diameters-and-dimensions\/\">0.1640 inches in decimal<\/a>. It is 5\/32 inches in fractional. It is 4.17 millimeters in metric.<\/p><table><thead><tr><th>\u6e2c\u5b9a\u30bf\u30a4\u30d7<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Decimal<\/td><td>0.1640 in<\/td><\/tr><tr><td>Fractional<\/td><td>5\/32 in<\/td><\/tr><tr><td>\u30e1\u30fc\u30c8\u30eb\u6cd5<\/td><td>4.17 mm<\/td><\/tr><\/tbody><\/table><p><span data-preserver-spaces=\"true\">Knowing the right diameter helps you choose the best screw. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\">\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.plasticstoday.com\/automotive-mobility\/plastic-part-design-selecting-appropriate-screw-fasteners\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">helps stop cracks in plastic<\/span><\/a><span data-preserver-spaces=\"true\">. It also makes things stronger. Your projects will be safer and last longer.<\/span><\/p><h2><span data-preserver-spaces=\"true\">\u8981\u70b9<\/span><\/h2><ul><li><span data-preserver-spaces=\"true\">The #8 screw diameter is about 0.164 inches. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> is also 5\/32 inches or 4.17 mm. It is a common mid-size screw for many jobs.<\/span><\/li><li><span data-preserver-spaces=\"true\">Always check both decimal and fractional sizes. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps you pick the correct screw. It also enables you to avoid mistakes in your work.<\/span><\/li><li><span data-preserver-spaces=\"true\">Use the correct\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/%e8%a3%bd%e5%93%81\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">pilot hole size<\/span><\/a><span data-preserver-spaces=\"true\"> for your project. Use 7\/64 inch for hardwood. Use 3\/32 inch for softwood. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> stops wood from splitting. It also makes the screw hold better.<\/span><\/li><li><span data-preserver-spaces=\"true\">#8 screws are suitable for furniture and cabinets. They <\/span><span data-preserver-spaces=\"true\">are also used<\/span><span data-preserver-spaces=\"true\"> in light construction. You can also use them in electronics and cars. They are strong and valuable for many things.<\/span><\/li><li><span data-preserver-spaces=\"true\">Select the appropriate\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/%e8%a3%bd%e5%93%81\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">screw material<\/span><\/a><span data-preserver-spaces=\"true\"> and length for your project. Use stainless steel for outdoor projects. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"><span data-preserver-spaces=\"true\"> keeps your work safe and secure, ensuring its long-lasting durability.<\/span><\/span><p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-8211 size-full\" title=\"what is diameter of 8 screw\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/what-is-diameter-of-8-screw.jpg\" alt=\"what is diameter of 8 screw\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/what-is-diameter-of-8-screw.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/what-is-diameter-of-8-screw-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/what-is-diameter-of-8-screw-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/what-is-diameter-of-8-screw-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/what-is-diameter-of-8-screw-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><\/li><\/ul><h2><span data-preserver-spaces=\"true\">#8 Screw Diameter<\/span><\/h2><h3><span data-preserver-spaces=\"true\">Decimal and Fractional Sizes<\/span><\/h3><p><span data-preserver-spaces=\"true\">When you look at screws in North America, you often see numbers like #6, #8, or #10. These numbers tell you the size of the screw. The #8 screw diameter is a common choice for\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/%e4%b9%be%e5%bc%8f%e5%a3%81%e3%81%ad%e3%81%98%e9%81%b8%e6%8a%9e%e3%82%ac%e3%82%a4%e3%83%89\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">many projects<\/span><\/a><span data-preserver-spaces=\"true\">. You measure this diameter across the outside of the threads. In decimal form, the #8 screw diameter is\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/en.wikipedia.org\/wiki\/Unified_Thread_Standard\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">0.1640 inches<\/span><\/a><span data-preserver-spaces=\"true\">. This measurement <\/span><span data-preserver-spaces=\"true\">is based<\/span><span data-preserver-spaces=\"true\"> on the Unified Thread Standard, which establishes the guidelines for screw sizes in the United States.<\/span><\/p><p><span data-preserver-spaces=\"true\">You might also see fractional sizes used in woodworking or construction. For a #8 screw, the closest fractional size is 5\/32 inches. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> is not an exact match, but it helps you compare the #8 screw to other sizes. Here is a\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/henrysautowarehouse.com\/comparison-chart-for-screw-size-inch-fractions-decimals-and-millimeters\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">table that shows how the #8 screw diameter compares<\/span><\/a><span data-preserver-spaces=\"true\"> to other popular screw sizes:<\/span><\/p><table><thead><tr><th>\u30cd\u30b8\u30b5\u30a4\u30ba<\/th><th>Fractional Size<\/th><th>Decimal Size (inches)<\/th><\/tr><\/thead><tbody><tr><td>#6<\/td><td>9\/64<\/td><td>0.1406<\/td><\/tr><tr><td>#8<\/td><td>5\/32<\/td><td>0.15625<\/td><\/tr><tr><td>#10<\/td><td>3\/16<\/td><td>0.1875<\/td><\/tr><\/tbody><\/table><p><span data-preserver-spaces=\"true\">You can see that the #8 screw sits right between the #6 and #10 screws. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> makes it a great mid-range option for many tasks. Most\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/%e4%b9%be%e5%bc%8f%e5%a3%81%e7%94%a8%e3%81%ad%e3%81%98%e3%81%ae%e7%a8%ae%e9%a1%9e\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">builders and DIYers<\/span><\/a><span data-preserver-spaces=\"true\"> use #6, #8, and #10 screws the most. The #8 screw diameter strikes a balance between strength and size.<\/span><\/p><p><img decoding=\"async\" src=\"https:\/\/statics.mylandingpages.co\/static\/fact\/36c8922fc38e4a5dbad86388d0d8bd6d\/chart_1752731973726824427.webp\" alt=\"Bar chart comparing decimal sizes of #6, #8, and #10 screws\" \/><\/p><blockquote><p><strong><span data-preserver-spaces=\"true\">\u30d2\u30f3\u30c8\uff1a<\/span><\/strong><span data-preserver-spaces=\"true\"> When you pick a screw, always check both the decimal and fractional sizes. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps you avoid mistakes and choose the right fit for your project.<\/span><\/p><h3><span data-preserver-spaces=\"true\">Metric Conversion<\/span><\/h3><p><span data-preserver-spaces=\"true\">Sometimes, you need to use metric measurements, primarily when working with international parts or tools. The #8 screw diameter in metric units is about\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/monsterbolts.com\/pages\/us-screw-sizes\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">4.17 millimeters<\/span><\/a><span data-preserver-spaces=\"true\">. You get this number by multiplying the decimal inch size (0.164 inches) by 25.4, which is the number of millimeters in an inch.<\/span><\/p><\/blockquote><table><thead><tr><th>\u30cd\u30b8\u30b5\u30a4\u30ba<\/th><th>Decimal Inch<\/th><th>Metric Equivalent (mm)<\/th><\/tr><\/thead><tbody><tr><td>#8<\/td><td>0.164<\/td><td>4.17<\/td><\/tr><\/tbody><\/table><p><span data-preserver-spaces=\"true\">You should know that there is\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.wanhong-fastener.com\/understanding-imperial-and-metric-screw-sizes-a-comprehensive-guide\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">no exact metric screw that matches the #8 screw diameter<\/span><\/a><span data-preserver-spaces=\"true\">. Metric screws use direct millimeter measurements, while the #8 screw uses the Imperial gauge system. For example, a metric M4.2 screw is similar in size, but the threads and shape differ. You cannot swap them without checking the fit.<\/span><\/p><p><strong><span data-preserver-spaces=\"true\">\u6ce8\u8a18\uff1a<\/span><\/strong><span data-preserver-spaces=\"true\"> Metric and Imperial screws are not interchangeable. Always match the screw type to the hole and material you use.<\/span><\/p><p><img decoding=\"async\" class=\"aligncenter wp-image-8206 size-full\" title=\"number 8 screw diameter\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/number-8-screw-diameter.jpg\" alt=\"number 8 screw diameter\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/number-8-screw-diameter.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/number-8-screw-diameter-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/number-8-screw-diameter-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/number-8-screw-diameter-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/number-8-screw-diameter-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><p><span data-preserver-spaces=\"true\">The #8 screw diameter gives you flexibility. You can use it in both Imperial and metric projects if you know the right conversions. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> makes it a popular choice for builders, woodworkers, and anyone who needs a reliable fastener.<\/span><\/p><p><img decoding=\"async\" class=\"aligncenter wp-image-8196 size-full\" title=\"8 32 \u306d\u3058\u5f84\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-1.jpg\" alt=\"8 32 \u306d\u3058\u5f84\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-1.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-1-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-1-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-1-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-1-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><h2><span data-preserver-spaces=\"true\">Screw Sizing Explained<\/span><\/h2><h3><span data-preserver-spaces=\"true\">What &#8220;#8&#8221; Means<\/span><\/h3><p><span data-preserver-spaces=\"true\">When you see a screw labeled as &#8220;#8,&#8221; you are looking at a code that indicates its thickness. The number &#8220;8&#8221; stands for the screw&#8217;s diameter, not its length or thread type. According to industry standards, a #8 screw has a\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.dkhardware.com\/blog\/screw-size-guide\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">diameter of about 0.164 inches<\/span><\/a><span data-preserver-spaces=\"true\">, which is close to 5\/32 inches. This size works well for many jobs, especially in furniture and cabinet making. You will often find #8 screws in kits for shelves, drawers, and light construction.<\/span><\/p><p><span data-preserver-spaces=\"true\">The &#8220;#8&#8221; label helps you pick the right screw for your project. It gives you a quick way to match the screw to the hole size and the material you are using.<\/span><\/p><p><span data-preserver-spaces=\"true\">You should also know that the #8 screw diameter comes with a standard\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/fastener-thread-terminology-and-terms\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">thread count<\/span><\/a><span data-preserver-spaces=\"true\">. Most #8 screws have\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.essentracomponents.com\/en-us\/news\/solutions\/fastening-components\/what-are-screw-thread-sizes\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">32 threads per inch<\/span><\/a><span data-preserver-spaces=\"true\"> (TPI). This thread count makes the screw strong and easy to drive into wood or plastic.<\/span><\/p><table><thead><tr><th>\u30cd\u30b8\u30b5\u30a4\u30ba<\/th><th>\u76f4\u5f84\uff08\u30a4\u30f3\u30c1\uff09<\/th><th>Threads Per Inch (TPI)<\/th><\/tr><\/thead><tbody><tr><td>#8<\/td><td>0.164<\/td><td>32<\/td><\/tr><\/tbody><\/table><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8203 size-full\" title=\"diameter of a number 8 screw\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/diameter-of-a-number-8-screw.jpg\" alt=\"diameter of a number 8 screw\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/diameter-of-a-number-8-screw.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/diameter-of-a-number-8-screw-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/diameter-of-a-number-8-screw-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/diameter-of-a-number-8-screw-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/diameter-of-a-number-8-screw-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><h3><span data-preserver-spaces=\"true\">Thread Pitch and Head Diameter<\/span><\/h3><p><span data-preserver-spaces=\"true\">Thread pitch indicates the number of threads that run along one inch of the screw. For an #8 screw, the\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.mudgefasteners.com\/thread-pitch-charts\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">standard coarse thread pitch<\/span><\/a><span data-preserver-spaces=\"true\"> \u306f\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.fastenermart.com\/files\/wood-screw-dimensions.html\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">15 threads per inch<\/span><\/a><span data-preserver-spaces=\"true\">. This design helps the screw grip tightly and hold materials together. You can use this screw in wood, plastic, or thin metal.<\/span><\/p><p><span data-preserver-spaces=\"true\">The head diameter is another essential part of screw sizing. The head is the top part of the screw that sits above the surface. For a #8 screw, the head diameter changes based on the type of head:<\/span><\/p><ul><li><span data-preserver-spaces=\"true\">Flat and oval heads: about 0.312 inches (5\/16 inch)<\/span><\/li><li><span data-preserver-spaces=\"true\">Round heads: about 0.298 inches (19\/64 inch)<\/span><\/li><\/ul><table><thead><tr><th>\u30d8\u30c3\u30c9\u30bf\u30a4\u30d7<\/th><th>Head Diameter (inches)<\/th><\/tr><\/thead><tbody><tr><td>Flat\/Oval<\/td><td>0.312<\/td><\/tr><tr><td>Round<\/td><td>0.298<\/td><\/tr><\/tbody><\/table><p><span data-preserver-spaces=\"true\">Knowing the thread pitch and head diameter helps you choose the right driver bit, ensuring the screw fits your project. Always verify these numbers before beginning your work.<\/span><\/p><h2><span data-preserver-spaces=\"true\">Measuring Screw Diameter<\/span><\/h2><p><img decoding=\"async\" src=\"https:\/\/statics.mylandingpages.co\/static\/aaanxdmf26c522mpaaaeerwr4pxy2i7u\/image\/5ab4fe321a0846edb40e696d3f832825.webp\" alt=\"Measuring Screw Diameter\" \/><\/p><h3><span data-preserver-spaces=\"true\">Tools for Measurement<\/span><\/h3><p><span data-preserver-spaces=\"true\">You need the right tools to measure screw diameter. A ruler can help, but it is not very exact. Calipers provide a more accurate measurement of the threads. A screw gauge has holes for different sizes. You slide the screw into each hole to find the right one.<\/span><\/p><p><span data-preserver-spaces=\"true\">For critical projects, always\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/guide-sourcing-screws\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">check the screw size<\/span><\/a><span data-preserver-spaces=\"true\"> first. Follow industry standards to ensure you have the correct size. Here are some steps you can use:<\/span><\/p><ol><li><span data-preserver-spaces=\"true\">Verify the screw size and shape using\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.qualitymag.com\/articles\/98082-screw-thread-inspection-options-dimensions-and-decisions\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">industry standards, such as ASME B1.3<\/span><\/a><span data-preserver-spaces=\"true\">.<\/span><\/li><li><span data-preserver-spaces=\"true\">Use a GO gage at Maximum Material Condition to see if the screw fits.<\/span><\/li><li><span data-preserver-spaces=\"true\">Try GO\/NO GO gages for a fast check.<\/span><\/li><li><span data-preserver-spaces=\"true\">Use indicating gauges if you need a more exact measurement.<\/span><\/li><li><span data-preserver-spaces=\"true\">Utilize advanced tools, such as optical comparators or coordinate measuring machines, for a comprehensive check.<\/span><\/li><li><span data-preserver-spaces=\"true\">\u305d\u306e\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/threaded-fasteners\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">screw and hole must fit<\/span><\/a><span data-preserver-spaces=\"true\"> well and stay tight for best results.<\/span><\/li><\/ol><p><span data-preserver-spaces=\"true\">Tip: Always check your screw size before you start. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps you avoid mistakes and keeps your project firm.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8193 size-full\" title=\"8 screw size diameter\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-size-diameter.jpg\" alt=\"8 screw size diameter\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-size-diameter.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-size-diameter-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-size-diameter-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-size-diameter-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-size-diameter-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><h3><span data-preserver-spaces=\"true\">Pilot Hole Sizes<\/span><\/h3><p><span data-preserver-spaces=\"true\">Drilling the right pilot hole is essential for a firm hold. It also stops the material from splitting. The pilot hole guides the screw, making it easier to drive in. For an #8 screw, the pilot hole size depends on the material <\/span><span data-preserver-spaces=\"true\">being used<\/span><span data-preserver-spaces=\"true\">.<\/span><\/p><table><thead><tr><th>\u7d20\u6750<\/th><th>Recommended Pilot Hole Size for #8 Screws<\/th><\/tr><\/thead><tbody><tr><td>\u30cf\u30fc\u30c9\u30a6\u30c3\u30c9<\/td><td>7\/64 inches<\/td><\/tr><tr><td>\u91dd\u8449\u6a39<\/td><td>3\/32 inches<\/td><\/tr><tr><td>\u30e1\u30bf\u30eb<\/td><td>N\/A (not specified in manufacturer guidelines)<\/td><\/tr><tr><td>\u30d7\u30e9\u30b9\u30c1\u30c3\u30af<\/td><td>N\/A (not specified in manufacturer guidelines)<\/td><\/tr><\/tbody><\/table><p><span data-preserver-spaces=\"true\">If you use hardwood, pick a\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/flowyline.com\/blogs\/for-diy-ers\/how-to-choose-the-correct-size-wood-screws\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">7\/64-inch drill bit<\/span><\/a><span data-preserver-spaces=\"true\">. For softwood, use a 3\/32-inch drill bit. These sizes help the screw hold tight and stop cracks. For metal and plastic, check the manufacturer&#8217;s guide. The correct pilot hole size varies depending on the type and thickness of the material.<\/span><\/p><p><strong><span data-preserver-spaces=\"true\">\u6ce8\u8a18\uff1a<\/span><\/strong><span data-preserver-spaces=\"true\"> Using the correct pilot hole size for the #8 screw diameter ensures your project&#8217;s safety and helps the screw last longer.<\/span><\/p><h2><span data-preserver-spaces=\"true\">Common Applications<\/span><\/h2><p><img decoding=\"async\" src=\"https:\/\/statics.mylandingpages.co\/static\/aaanxdmf26c522mpaaaeerwr4pxy2i7u\/image\/133dac5730f645ef98864a03f5970708.webp\" alt=\"Common Applications\" \/><\/p><p><span data-preserver-spaces=\"true\">You can use #8 screws in a variety of projects. They work well in lots of situations. These screws are called all-purpose fasteners. Many people use them for home or workshop jobs. Here are some common ways to use them:<\/span><\/p><ul><li><span data-preserver-spaces=\"true\">Furniture assembly<\/span><\/li><li><span data-preserver-spaces=\"true\">Cabinet installation<\/span><\/li><li><span data-preserver-spaces=\"true\">Light construction projects<\/span><\/li><li><span data-preserver-spaces=\"true\">Electronics mounting<\/span><\/li><li><span data-preserver-spaces=\"true\">Automotive repairs<\/span><\/li><\/ul><h3><span data-preserver-spaces=\"true\">Furniture and Cabinets<\/span><\/h3><p><span data-preserver-spaces=\"true\">#8\u30cd\u30b8 <\/span><span data-preserver-spaces=\"true\">are commonly used<\/span><span data-preserver-spaces=\"true\"> in furniture and cabinets. They hold wood pieces together in hardwood and softwood. Their size provides a firm grip without splitting wood. Many #8 screws are self-tapping. You do not need to drill a hole first. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> saves time and effort.<\/span><\/p><p><span data-preserver-spaces=\"true\">When selecting screws for furniture, consider the material of the furniture. Stainless steel screws do not rust. Brass screws look nice when visible. Coarse threads are best for softwood. Fine threads are better for hardwood. Select the right length so that the screw does not protrude beyond the surface. These things make #8 screws a good choice for strong furniture and cabinets.<\/span><\/p><p><span data-preserver-spaces=\"true\">Tip: Use the correct screw length and material for optimal performance. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps your furniture stay strong and look good.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8190 size-full\" title=\"8 screw diameter mm\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-mm.jpg\" alt=\"8 screw diameter mm\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-mm.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-mm-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-mm-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-mm-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-mm-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><h3><span data-preserver-spaces=\"true\">Light Construction<\/span><\/h3><p><span data-preserver-spaces=\"true\">#8 screws are great for light construction jobs. You can use them to build shelves or attach trim. They also work on putting up wall panels. These screws are strong and hold things tightly. In tests, an #8 screw can hold about 7,350 pounds. That is as heavy as a large SUV! <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> makes them suitable for jobs that require strength and ease of use.<\/span><\/p><p><span data-preserver-spaces=\"true\">\u00a0<\/span><\/p><p><img decoding=\"async\" src=\"https:\/\/statics.mylandingpages.co\/static\/fact\/7345d5d1c897414e9c5728f505a2c785\/chart_1752731974811659007.webp\" alt=\"Bar chart comparing load capacity of different screw sizes, showing increasing strength with larger diameters.\" \/><\/p><p><span data-preserver-spaces=\"true\">Always match the screw size to your job. For most home projects, #8 screws are a strong and easy-to-use option.<\/span><\/p><h3><span data-preserver-spaces=\"true\">Electronics and Automotive<\/span><\/h3><p><span data-preserver-spaces=\"true\">#8 screws are essential in electronics and cars. You use them to mount circuit boards and attach panels. They also hold small parts in place. These screws come in many types. Some have Torx, Philips, or hex drives. Some have special coatings or glue to stop them from coming loose.<\/span><\/p><table><thead><tr><th>\u30a2\u30b9\u30da\u30af\u30c8<\/th><th>\u8a73\u7d30<\/th><\/tr><\/thead><tbody><tr><td>\u306d\u3058\u8fbc\u307f\u5f0f<\/td><td><a href=\"https:\/\/www.globalspec.com\/industrial-directory\/8-32_torx_machine_screws\">Machine screws, including 8-32 Torx machine screws<\/a><\/td><\/tr><tr><td>\u99c6\u52d5\u65b9\u5f0f<\/td><td>Torx, Philips, Hex Socket, Posidriv, Slotted, Square Robertson<\/td><\/tr><tr><td>Head Types<\/td><td>Binding, Fillister, Flat, Hexagon, Oval, Pan, Round, Socket Head Cap, Square, Truss<\/td><\/tr><tr><td>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/td><td>Electronics (e.g., board mounting, slim-line PC screw terminals), Automotive (tiered sectors)<\/td><\/tr><tr><td>Special Features<\/td><td>Pre-applied adhesive fasteners (Dri-Loc\u00ae) converting screws into self-locking fasteners<\/td><\/tr><tr><td>\u696d\u754c\u6a19\u6e96<\/td><td>ASME\/ANSI, DIN, ISO, SAE<\/td><\/tr><tr><td>Material Examples<\/td><td>Stainless steel, titanium socket head cap screws<\/td><\/tr><tr><td>Length Range<\/td><td>2.5 to 6 inches (varies by product)<\/td><\/tr><\/tbody><\/table><p><span data-preserver-spaces=\"true\">Always check the industry standards for electronics or car work. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> ensures safety and ensures that parts fit correctly.<\/span><\/p><p><span data-preserver-spaces=\"true\">Note: #8 screws are popular because they are versatile and work in many applications. You can use them in wood, metal, plastic, and more. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> makes them a top pick for pros and hobbyists.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8187 size-full\" title=\"8 32 \u306d\u3058\u5f84\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter.jpg\" alt=\"8 32 \u306d\u3058\u5f84\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-32-screw-diameter-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><h2><span data-preserver-spaces=\"true\">Size Comparison Table<\/span><\/h2><h3><span data-preserver-spaces=\"true\">#8 vs Other Screw Sizes<\/span><\/h3><p><span data-preserver-spaces=\"true\">When selecting screws for your project, it&#8217;s essential to understand how different sizes compare. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps you choose the right one for your strength and fitness needs. The #8 screw diameter sits between the smaller #6 and the larger #10. You can see the differences in the table below. The table displays the screw size, diameter in inches, and its metric equivalent in millimeters.<\/span><\/p><table><thead><tr><th>\u30cd\u30b8\u30b5\u30a4\u30ba<\/th><th>\u76f4\u5f84\uff08\u30a4\u30f3\u30c1\uff09<\/th><th>\u76f4\u5f84 (mm)<\/th><\/tr><\/thead><tbody><tr><td>#6<\/td><td>0.138<\/td><td>3.51<\/td><\/tr><tr><td>#8<\/td><td>0.164<\/td><td>4.17<\/td><\/tr><tr><td>#10<\/td><td>0.190<\/td><td>4.83<\/td><\/tr><tr><td>#12<\/td><td>0.216<\/td><td>5.49<\/td><\/tr><\/tbody><\/table><blockquote><p><span data-preserver-spaces=\"true\">You can use this table as a quick reference when shopping for screws or planning your next project.<\/span><\/p><p><span data-preserver-spaces=\"true\">If you examine the numbers, you will see that the #8 screw diameter strikes a balance between strength and size. You might use #6 screws for lighter jobs, like hanging small pictures. You might pick #10 or #12 screws for heavy-duty tasks, such as mounting shelves or building frames.<\/span><\/p><ul><li><span data-preserver-spaces=\"true\">#6 screws work well for thin materials and light loads.<\/span><\/li><li><span data-preserver-spaces=\"true\">#8 screws are suitable for most home and workshop projects.<\/span><\/li><li><span data-preserver-spaces=\"true\">#10 screws give extra holding power for thicker or heavier materials.<\/span><\/li><\/ul><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8186 size-full\" title=\"#8 screw diameter\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter.jpg\" alt=\"#8 screw diameter\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/8-screw-diameter-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><p><span data-preserver-spaces=\"true\">You should always match the screw size to your material and the job you want to do. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps you avoid problems like stripped holes or weak joints. If you use the right size, your project will last longer and stay safe.<\/span><\/p><p><span data-preserver-spaces=\"true\">You have learned that choosing the correct screw size keeps your projects safe and strong. The table below highlights essential facts about #8 screws:<\/span><\/p><\/blockquote><table><thead><tr><th>\u30a2\u30b9\u30da\u30af\u30c8<\/th><th>\u8a73\u7d30<\/th><\/tr><\/thead><tbody><tr><td>\u76f4\u5f84<\/td><td><a href=\"https:\/\/fasteningspecialists.com\/tek-8-screws\/\">0.164 inches<\/a><\/td><\/tr><tr><td>Threads per Inch<\/td><td>32 (standard), 36 (some standards)<\/td><\/tr><tr><td>Length Range<\/td><td>1&#8243; to 3&#8243;<\/td><\/tr><tr><td>\u30d8\u30a2\u30b9\u30bf\u30a4\u30eb<\/td><td><a href=\"https:\/\/princefastener.com\/ja\/%e3%83%88%e3%83%a9%e3%82%b9%e3%81%ad%e3%81%98%e3%81%a8%e3%81%aa%e3%81%b9%e3%81%ad%e3%81%98\/\">Hex washer, truss, pan, flat undercut<\/a><\/td><\/tr><tr><td>\u6750\u6599<\/td><td>Stainless steel, zinc-plated steel<\/td><\/tr><tr><td>\u4e3b\u306a\u7528\u9014<\/td><td>Metal-to-metal, wood-to-metal, roofing, custom jobs<\/td><\/tr><\/tbody><\/table><blockquote><p>Always match screw size, length, and material to your project. Drill pilot holes that fit the screw and prevent splitting.<br \/><img decoding=\"async\" src=\"https:\/\/statics.mylandingpages.co\/static\/fact\/3262c3cd4d43470eb01e464ded8e44fa\/chart_1752731985838365136.webp\" alt=\"Grouped bar chart comparing pilot hole and countersink sizes for different screw sizes in hardwood and softwood.\" \/><\/p><\/blockquote><p>Follow these tips:<\/p><ul><li><a href=\"https:\/\/windowhardwaredirect.com\/blogs\/news\/understanding-the-versatility-of-8-screws-a-guide-for-diy-enthusiasts\">Pick screw length to reach at least halfway<\/a>\u00a0into the material.<\/li><li>Use stainless steel for outdoor projects.<\/li><li>Avoid over-tightening to prevent damage.<\/li><li>Inspect screws before use.<\/li><\/ul><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8207 size-full\" title=\"screw #8 diameter\" src=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/screw-8-diameter.jpg\" alt=\"screw #8 diameter\" width=\"682\" height=\"452\" srcset=\"https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/screw-8-diameter.jpg 682w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/screw-8-diameter-300x199.jpg 300w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/screw-8-diameter-150x99.jpg 150w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/screw-8-diameter-18x12.jpg 18w, https:\/\/princefastener.com\/wp-content\/uploads\/2025\/07\/screw-8-diameter-600x398.jpg 600w\" sizes=\"(max-width: 682px) 100vw, 682px\" \/><\/p><h2><span data-preserver-spaces=\"true\">FAQ about #8 screw diameter\u00a0<\/span><\/h2><h3><span data-preserver-spaces=\"true\">What does the &#8220;#8&#8221; mean on a screw?<\/span><\/h3><p><span data-preserver-spaces=\"true\">You see &#8220;#8&#8221; on a screw. This number indicates the diameter of the screw. A #8 screw measures approximately 0.164 inches in diameter. It does not tell you the length or thread type.<\/span><\/p><h3><span data-preserver-spaces=\"true\">Can you use #8 screws for outdoor projects?<\/span><\/h3><p><span data-preserver-spaces=\"true\">Yes, you can use #8 screws outside. Pick\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/%e8%a3%bd%e5%93%81\/%e3%82%b9%e3%83%86%e3%83%b3%e3%83%ac%e3%82%b9%e9%8b%bc%e6%a9%9f%e6%a2%b0%e3%81%ad%e3%81%98\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">stainless steel<\/span><\/a><span data-preserver-spaces=\"true\"> or coated screws. These resist rust and weather. Always check the material before you start your project.<\/span><\/p><h3><span data-preserver-spaces=\"true\">What drill bit size should you use for an #8 screw?<\/span><\/h3><p><span data-preserver-spaces=\"true\">For hardwood, use a 7\/64-inch drill bit. For softwood, using a 3\/32-inch bit. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> helps the screw grip well and prevents splitting.<\/span><\/p><h3><span data-preserver-spaces=\"true\">Are #8 screws suitable for metal?<\/span><\/h3><p><span data-preserver-spaces=\"true\">You can use #8 screws for thin metal. Choose\u00a0<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/princefastener.com\/ja\/%e8%a3%bd%e5%93%81\/square-slotted-self-tapping-screws-supplier\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">\u30bb\u30eb\u30d5\u30bf\u30c3\u30d4\u30f3\u30b0<\/span><\/a><span data-preserver-spaces=\"true\"> or machine screws. Always check the manufacturer&#8217;s guide for the best fit.<\/span><\/p><h3><span data-preserver-spaces=\"true\">How do you measure an #8 screw?<\/span><\/h3><p><span data-preserver-spaces=\"true\">Use a caliper or screw gauge. Measure across the threads, not the head. <\/span><span data-preserver-spaces=\"true\">\u3053\u308c\u306f<\/span><span data-preserver-spaces=\"true\"> gives you the correct diameter for matching holes and tools.<\/span><\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>You might see #8 screws in lots of projects. The exact size is very important. The #8 screw diameter is\u00a00.1640 inches in decimal. It is 5\/32 inches in fractional. It is 4.17 millimeters in metric. Measurement Type Value Decimal 0.1640 in Fractional 5\/32 in Metric 4.17 mm Knowing the right diameter helps you choose the best screw. This\u00a0helps stop cracks in plastic. It also makes things stronger. Your projects will be safer and last longer. Key Takeaways The #8 screw diameter is about 0.164 inches. This is also 5\/32 inches or 4.17 mm. It is a common mid-size screw for many jobs. Always check both decimal and fractional sizes. This [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8195,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"149","_seopress_titles_title":"Explaining #8 Screw Diameter and Its Common Applications","_seopress_titles_desc":"#8 screw diameter: 0.164 in, 4.17 mm. Stock the mid-size fastener for furniture, cabinets, light construction. 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