{"id":8335,"date":"2025-07-24T10:49:15","date_gmt":"2025-07-24T02:49:15","guid":{"rendered":"https:\/\/princefastener.com\/?p=8335"},"modified":"2025-07-24T15:42:39","modified_gmt":"2025-07-24T07:42:39","slug":"316-ss-screws-vs-304-ss-screws","status":"publish","type":"post","link":"https:\/\/princefastener.com\/ar\/316-ss-screws-vs-304-ss-screws\/","title":{"rendered":"316 SS Screws vs 304 SS Screws: The Ultimate Global Buyer\u2019s Guide to Strength, Corrosion & Cost"},"content":{"rendered":"
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Welcome to the Prin<\/span>ce Fastener knowledge <\/span>hub, your single-source authority on <\/span>316 ss screws<\/span><\/strong><\/a>. <\/span>For more than two decades, we have lived and breathed stainless-steel fasteners, and today <\/span>we\u2019re<\/span> packaging everything we know into one practical guide so you can specify, buy, and install <\/span>316 <\/span>ss<\/span> \u0645\u0633\u0627\u0645\u064a\u0631<\/span><\/strong> with absolute confidence.<\/span> Whether you are a structural engineer balancing salt-spray resistance with 800 MPa tensile strength, a purchasing manager juggling fluctuating nickel and molybdenum prices, or a maintenance team wondering why <\/span>yesterday\u2019s<\/span> 304 bolts are already showing tea-stain corrosion, the answers start here.<\/span><\/p>

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In the next few minutes you will learn why the simple phrase<\/span> \u201c<\/span>316 \u0641\u0648\u0644\u0627\u0630 \u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623<\/span>\u201d <\/span>is only half the story\u2014the hidden half is the performance class (A4-70 vs A4-80), the surface finish (passivated, electro-polished, or laser-marked), and the supply-chain reliability that ultimately decides if your project meets spec on time and budget. <\/span>We\u2019ll<\/span> decode standards from ISO 3506 to ASTM F879, translate ksi into MPa, and compare real-world costs per thousand pieces delivered to your dock. <\/span><\/p>

By the end of this article, <\/span>you\u2019ll<\/span> understand exactly when to upgrade from 304, how to justify the 2\u00d7 price delta to your finance team, and which Prince Fastener SKU\u2014hex, socket, thread-forming, or custom stud<\/a>\u2014fits your torque table and salt-fog requirement. Bookmark this page, share it with your QA and procurement colleagues, and keep our contact button handy<\/span>: when<\/span> the spec sheet <\/span>is finalized<\/span>, Prince Fastener is ready to ship fully certified <\/span>316 ss screws<\/span><\/strong> from our global warehouses within 24 hours.<\/span><\/p>

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Understanding Stainless Steel Screw Strength<\/span><\/h2>

At Prince Fastener, we understand<\/span> “<\/span>\u0627\u0644\u0642\u0648\u0629<\/span>” <\/span>for stainless steel screws from two perspectives:<\/span><\/p>

  1. The specific stainless steel material chosen<\/span><\/strong> (e.g., 304, 316, 431).<\/span><\/li>
  2. The performance grade achieved by that material according to standards<\/span><\/strong> (e.g., A2-50, A2-70, A4-80).<\/span><\/li><\/ol>

    We provide a comprehensive comparison of the most commonly used austenitic 304 and 316, and also introduce high-strength material options for quick selection.<\/span><\/p>

    I. Mechanical Properties of 304 SS Screws and 316 Austenitic SS Screws<\/span><\/h3>
    Dimension<\/td>304 Stainless Steel Screws<\/td>316 Stainless Steel Screws<\/td>Remarks<\/td><\/tr><\/thead>
    Room Temperature Strength (MPa)<\/b><\/td>Tensile 515\u2013690, Yield \u2248205<\/td>Tensile 515\u2013690, Yield 205\u2013220<\/td>Both have similar nominal values, with 316 being slightly higher; 316 maintains strength better at high temperatures.<\/td><\/tr>
    Strength Grade Example<\/b><\/td>A2-70 (g<\/span>e<\/span>700<\/span><\/span><\/span><\/span><\/span> MPa)<\/td>A4-70 (g<\/span>e<\/span>700<\/span><\/span><\/span><\/span><\/span> MPa)
    A4-80 (g<\/span>e<\/span>800<\/span><\/span><\/span><\/span><\/span> MPa)<\/td>    		When the grade numbers are the same, 316 offers superior corrosion resistance; A4-80 provides higher strength.<\/td><\/tr>
    \u0627\u0644\u062a\u0643\u0644\u0641\u0629<\/b><\/td>20%\u201330% lower<\/td>20%\u201330% higher<\/td>Primarily due to the 2%\u20133% molybdenum and higher nickel content; processing is also slightly more difficult.<\/td><\/tr>
    Applicable Scenarios<\/b><\/td>General atmosphere, freshwater, indoor decoration, home appliances<\/td>Marine, high-chloride, chemical, pharmaceutical, and other highly corrosive environments<\/td>316 can reduce long-term maintenance\/replacement costs.<\/td><\/tr><\/tbody><\/table>

    Note: Chinese cold heading processes typically achieve grade 70 for M5 and above; M4 and below usually reach only grade 50, unless <\/span>using<\/span> special cold-drawn wire.<\/span><\/em><\/p>

    II. Strength Conversion<\/span><\/h3>