{"id":3465,"date":"2022-11-17T18:13:40","date_gmt":"2022-11-17T10:13:40","guid":{"rendered":"https:\/\/princefastener.com\/?p=3465"},"modified":"2022-11-18T13:45:55","modified_gmt":"2022-11-18T05:45:55","slug":"what-are-the-basic-types-of-bolts","status":"publish","type":"post","link":"https:\/\/princefastener.com\/ja\/what-are-the-basic-types-of-bolts\/","title":{"rendered":"\u30dc\u30eb\u30c8\u306e\u57fa\u672c\u7684\u306a\u7a2e\u985e\u3068\u306f\uff1f"},"content":{"rendered":"
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By definition, bolts belong to the classification of threaded fasteners with a male (external) thread that mates with female (internal) threads of other fasteners. It consists of a head at one end, under the head is a smooth shank, and a threaded shaft by the middle. Bolts are one of the most used fasteners in the world, with a wide range of industrial applications from heavy-duty to critical assembly.\u00a0<\/span><\/p>

The basic types of bolts are; Anchor bolt, Carriage bolt, Flange bolt, Hanger bolt, Hex bolt \/ Tap bolt, Lag bolt, Sex bolt, Square head bolt, Stud bolt, T-head bolt, Toggle bolt, and U-bolt.<\/span><\/p>

\"<\/p>

Anchor bolt<\/span><\/h4>

From the word itself \u201danchor\u201d, they are used in the construction industry for concrete or masonry structural application. They secure the structural component into the concrete slab or poured foundation.<\/span><\/p>

Carriage bolt<\/span><\/h4>

This bolt was named after its original purpose, which was mainly in carriages. Carriage bolts are generally used in metal-to-wood applications.<\/span><\/p>

Flange bolt<\/span><\/h4>

Is a type of self-locking bolt that is used in hinges and locks to provide security while able to distribute a bearing load with a washer attached under its head. Flange bolts are also called frame bolts that feature a dome head and square section underneath.<\/span><\/p>

Hanger bolt<\/span><\/h4>

Hanger bolts consist of a tapered wood screw point on one end and a machine bolt thread on the other used in timber construction.<\/span><\/p>

Hex bolt \/ Tap bolt<\/span><\/h4>

Mostly referred to as hex bolts, is the most common type of bolt featuring a head with six sides or a hexagonal shape. They can be fully or partially threaded with variations of different types, they are used in machinery and construction.<\/span><\/p>

Lag bolt<\/span><\/h4>

Lag bolts and lag screws are typically used to connect heavy lumber because they create their mating thread on wood and other materials when tightened together.<\/span><\/p>

Sex bolt<\/span><\/h4>

Sex bolts are known by many different names, they require a female threaded component instead of a nut. This mating fastener consists of a male threaded screw and a threaded barrel.<\/span><\/p>

Square head bolt<\/span><\/h4>

Square head bolts are defined by their head with a square shape or four-sided instead of six (hexagonal or hex bolts). The head design facilitates easier grip of wrench tools in tightening while they present a machine screw thread.<\/span><\/p>

A stud bolt<\/span><\/h4>

is a headless bolt with threads on each end and operates by fastening objects with two tightened nuts on the sides.<\/span><\/p>

T-head bolt<\/span><\/h4>

T-head bolts or hammerheads are inserted into a slot with an applied nut that secures the turning of the bolt. Commonly used in concrete embed channels of construction and automotive industry.<\/span><\/p>

\u30c8\u30b0\u30eb\u30dc\u30eb\u30c8<\/span><\/h4>

Sometimes referred to as butterfly anchors, toggle bolts have a feature of expanding nuts in the shape of wings.\u00a0<\/span><\/p>

U\u30dc\u30eb\u30c8<\/span><\/h4>

shaped like the letter \u201cU\u201d, U-bolts are partially threaded in both ends. The curved section allows the support to pipeworks like liquid and gas flow.<\/span><\/p>

Read more about bolts and nuts with these articles>><\/span><\/p>

What are the types of bolts fasteners?<\/span><\/a><\/p>

What are nut and bolt fasteners?<\/span><\/a><\/p>

Why should I select the right combination of bolts and nuts?<\/span><\/a><\/p>

Types of bolt heads<\/b><\/h3>

Bolt head have variations of the kind that depends on their functionality and enables the installation grip of tools. The types of shapes classify them and some bolt heads can have drives like screws.<\/span><\/p>

Hex<\/span><\/h4>

Is the most common type of bolt head, Hex (hexagonal) head can be grabbed by a tool from all angles and sometimes with only a hand.<\/span><\/p>

Domed<\/span><\/h4>

head-on bolts allow a locking system that makes it difficult for them to be extracted once installed.\u00a0<\/span><\/p>

Bent<\/span><\/h4>

Bent heads can be available in different shapes depending on the required specification.\u00a0<\/span><\/p>

\u6b63\u65b9\u5f62<\/span><\/h4>

With the four-sided (bolt) head it allows an easy grip for tools during tightening and loosening.<\/span><\/p>

Pentagon<\/span><\/h4>

This type of head is designed to resist tampering from Torx and hex tools.<\/span><\/p>

Flat<\/span><\/h4>

heads are called countersunk which allow the saving of space on applications. They are convenient for many uses in areas that require smooth surfaces. (Ex. elevator bolts for elevator floors and walls)<\/span><\/p>

Know the bolts in sizes<\/b><\/h3>

Bolts by character have different sizes that allow classification of their function and effectiveness. There are variations of terms to remember in knowing the sizes of bolts such as;<\/span><\/p>

Major diameter<\/span><\/h4>

Major diameter refers to the imaginary diameter of the cylinder from the top of an external thread.<\/span><\/p>

Minor diameter<\/span><\/h4>

is a contrast to the imaginary cylinder at the top of the thread, this is located from the tread grooves.\u00a0<\/span><\/p>

Crest<\/span><\/h4>

Crest is the prominent (upper symbol) of the parts of threads.<\/span><\/p>

Root<\/span><\/h4>

The root is where the grooves of bottom threads are which are the two flanking spaces of surfaces.<\/span><\/p>

Flanks<\/span><\/h4>

are the straight sides that connect the crest and root in threads of bolts.<\/span><\/p>

Thread angles<\/span><\/h4>

are the spaces between threads\/flanks.<\/span><\/p>

Pitch<\/span><\/h4>

is the measured distance of paralleled axis.<\/span><\/p>

A guide to bolt grades<\/b><\/h3>

Usually, bolts are measured by their strength. Bolt grades are indicated in markings (raised dashes or markings) in bolt heads, they are the indication of strength on bolts or the manufacturer\u2019s rank.\u00a0<\/span><\/p>

The primary system of bolt grades<\/span><\/p>

SAE<\/span><\/p><\/td>

SAE or Society of Automotive Engineers this grade indicates raised dashes on bolt heads<\/span><\/p>

Grades: 2 (low strength) – low or medium carbon steel<\/span><\/p>

\u00a05 (medium strength) – medium carbon steel, quenched and tempered<\/span><\/p>

\u00a08 (high strength) – medium carbon alloy steel, quenched and tempered<\/span><\/p><\/td><\/tr>

ASTM<\/span><\/p><\/td>

American Society for Testing and Materials (ASTM) indicates bolts markings in the head for bolt grades such as letter A and three numbers<\/span><\/p>

Grades: A307 – low carbon steel<\/span><\/p>

A325 (type 3) – carbon or alloy steel with or without boron<\/span><\/p>

A354 BD – alloy steel, quenched and tempered<\/span><\/p><\/td><\/tr>

\u30e1\u30fc\u30c8\u30eb\u6cd5<\/span><\/p><\/td>

Metric bolt grades are known as a property class set by ISO (International Standard Organization). This system uses two numbers separated by a dot.<\/span><\/p>

Grades:\u00a0<\/span><\/p>

Class 8.8 – medium carbon steel, quenched and tempered<\/span><\/p>

Class 10.9 – Alloy steel, quenched and tempered<\/span><\/p>

Class 12.9 – Alloy steel, quenched and tempered<\/span><\/p>

A2 & A4 stainless steel – alloy with chromium and nickel<\/span><\/p><\/td><\/tr><\/tbody><\/table>

\u00a0<\/p>

Know the fasteners in their processes and technicality>><\/span><\/p>

How are fasteners created?<\/span><\/a><\/p>

What are high-tensile fasteners?<\/span><\/a><\/p>

Where are bolts applied?<\/b><\/h3>

\"\u30d5\u30a1\u30b9\u30ca\u30fc\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\"<\/p>

Bolts have wide usage because of their quality in holding objects with strength and security. They not only possess great convenience but also the efficiency of securing materials together in many forms and functions. As expressed in the previous topics above, bolts have special classifications according to their purpose, which is why they are the preferred choice in many applications. Usually, bolts are considered for their characteristic to provide durability in critical areas such as heavy-duty assemblies and related chemical component workpieces. Here are some of the known industries that require bolt applications;<\/span><\/p>