ISO 10642 (DIN 7991) Countersunk Hex Socket Screw 10.9

The ISO 10642 (DIN 7991) countersunk hexagon socket head cap screw engineered in high tensile steel grade 10.9 is designed for mechanical assemblies requiring a completely flat, snag-free surface alongside elevated clamping force. Its 90° conical head sits perfectly flush with the mating component once installed into a standard countersunk hole, preventing physical interference in sliding mechanisms, machine guarding, and precision tooling.

Manufactured from quenched and tempered high-tensile alloy steel, grade 10.9 provides an approximate tensile strength of 1000 N/mm² and an 80% yield ratio (900 N/mm²), withstanding intense dynamic shear stresses and heavy tightening torques. The precision-broached internal hexagon drive prevents tool cam-out, enabling positive engagement and secure tightening even in confined engineering layouts.

Benefits:

• Completely Flush Surface Finish: 90° flat countersunk head eliminates external protrusions, ensuring zero snagging on sliding tracks, guide ways, and kinematic linkages.
• Grade 10.9 High Tensile Strength: Delivers substantial yield point resistance and pre-load retention under heavy structural vibration and mechanical shock.
• Precision Internal Hex Drive: Calibrated hexagonal recess facilitates balanced torque transfer with standard hex bits, preventing drive head stripping.