M12 x 25mm Socket Head Cap Screw DIN 912/Class 8.8 Zinc 100pk

Soko is a manufacturer of high-strength socket head fasteners and precision bolts produced to DIN and ISO standards. Their socket head cap screws and socket set screws are manufactured from alloy steel and stainless steel, heat-treated to Grade 12.9 and Grade 10.9 strength specifications, and are used across machine building, tooling, and precision engineering applications where high clamping force in a compact, recessed-drive fastener is required.

Soko socket head cap screws (SHCS) provide high-tensile clamping force in a compact cylindrical head with a hexagon socket drive, allowing installation in recessed or space-constrained locations where a spanner or external-drive fastener cannot be used. Available in Grade 12.9 alloy steel and A2/A4 stainless steel, they are the standard fastener for machine building, jig and fixture assembly, and precision engineering applications.

Where this product is used

Socket head cap screws are used across precision engineering and machine assembly:

• Machine tool and jig assembly where high clamping force in a small-envelope fastener is required.
• Hydraulic and pneumatic manifold assembly where socket heads allow installation in densely populated bolt patterns.
• Precision fixtures and tooling where the flat underhead bearing surface and accurate thread pitch of DIN 912 fasteners are specified.

Key specifications

Selecting the right option

Grade 12.9 alloy steel SHCS provide the highest tensile strength and are the standard choice for structural machine assembly. Stainless steel (A2 or A4) suits corrosive, food-grade, and marine environments where carbon steel would corrode. Select by M-size and thread length to suit the joint stack and required engagement. Always torque to the manufacturer's specification for the grade — under-torquing 12.9 fasteners wastes the available clamp load.