Hexagon Socket Head Cap Bolt DIN 912

Definition and structural characteristics

Definition: An internal hexagonal screw is a fastener with a hexagonal groove (internal hexagonal hole) on the head, which requires the use of an Allen Key or a hexagonal screwdriver head matched with an electric tool for installation and removal.

Structural features:

Head types: common cylindrical heads (such as ISO 4762/DIN 912), countersunk heads (such as DIN 7991), flat heads, etc., suitable for different installation requirements (such as countersunk heads used in scenarios where flush surfaces are required).

Thread type: full thread or half thread, with various materials and surface treatments

Materials and Surface Treatment

Common materials:

Carbon steel (such as 8.8 grade, 12.9 grade): high strength, used in machinery and automobiles.

Stainless steel (304/316): corrosion-resistant, suitable for outdoor and medical equipment.

Titanium alloy: lightweight, high corrosion resistance, used in aerospace.

Application scenarios

Industrial field: machine tools, molds, automation equipment (high-strength connections that require frequent disassembly).

Automotive/Aviation: Engine components, chassis (high temperature resistance, vibration resistance).

Consumer electronics: laptops, cameras (precision small-sized screws, such as M1.6).

Furniture/Bicycle: IKEA furniture assembly, bicycle brake system (countersunk anti scratch)

Usage tips:

The wrench should be fully inserted into the bottom of the hole to avoid sliding teeth caused by oblique force.

When pre drilling, countersunk screws need to match the taper (such as 90 °).

Regularly check the torque (using a torque wrench) to prevent over tightening or loosening.