Allen Socket Head Screw Specification

Allen Socket Head Screw - Manufacturer & Supplier in India

An Allen socket head screw, also known as a socket head cap screw, is a high-strength, precision fastener featuring a cylindrical head with a hexagonal recess (Allen drive). It is designed for applications where high torque and space efficiency are essential.

Below are technical specification for Allen Socket Head Screws (Socket Head Cap Screws), covering key dimensions and properties for common metric sizes:

ANSI B 18.3
Size	Length
Size	F/T	H/T
1/4"	1" - 2 3/8"	1 1/2" - 2 3/8"
5/16"	1 1 /4" - 2 3/4"	1 5/8" - 2 3/4"
3/8"	1 1 /4" - 2 3/4"	1 5/8" - 2 3/4"
7/16"	1 1 /2" - 3"	1 3/4" - 3 1/4"
1/2"	1 5 /8" - 3"	2 1/4" - 3 1/4"
9/16"	2" - 5 "	2 3/4" - 5 1/2"
8/8"	2 1 /4" - 6 "	2 3/4" - 5 1/2"

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Tensile Strength

≥800 MPa

Yield Strength

≥640 MPa

Elongation

≥14%

Hardness Max

39 HRB

Materials

Steel Grade

Finishing

Polished
Geomet
Dacromet
Teflon
Hot-Dip Galvanzing
Zinc (Yellow, White, Blue)
Black Qxide

Thread

Standards

Hexagonal Socket

The key attribute is the interior hex socket which accommodates an Allen wrench, enabling effective tightening and accurate manipulation.

Cylindrical Head

The cylindrical shape of the head enables it to sit flush or almost flush with the surface when fully tightened, making it perfect for situations that require a smooth surface.

Thread Coverage

Hex socket head cap screws come in either fully threaded or partially threaded variations, the latter featuring a smooth shank below the head. The choice between the two options depends on the specific application.

High Torque

The six-sided socket enables a significant amount of torque to be exerted, guaranteeing a firm and snug attachment.

Flush Finish

It is crucial for both aesthetic purposes and to avoid snagging that the cylindrical head can sit flush with the surface.

Versatility

The availability of different materials and thread options makes these suitable for a variety of uses.

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