Socket Head Machine Screw

The socket head machine screw combines an external hex head with integrated flat and spring washers, offering the torque stability of a hex head along with the efficiency of a pre-assembled unit. It is well-suited for general fastening on automotive chassis guards, engine accessories, motorcycle frame brackets, and light-duty hardware. This socket head machine screw simplifies assembly, prevents washer loss, and provides reliable clamping for non-critical load applications across various industries.

Produced according to ISO 4017, ISO 898-1, and GB/T 9074.13, the product is available in grades 4.8, 5.8, and 8.8, using Q235 or 45# carbon steel. Heat treatment and phosphating ensure mechanical stability, with grade 8.8 offering a tensile strength ≥800 MPa and a yield strength ≥640 MPa. Surface finishes such as blue/white zinc, chromate zinc , or Dacromet are RoHS-compliant, providing salt spray resistance of 240–480 hours for use in diverse environments.

Thread sizes range from M2 to M12, with lengths from 3 to 80 mm and 6g thread accuracy. The integrated washer is sized to match the shank (washer OD 6–24 mm, thickness 0.8–2.0 mm). Cold forming ensures a secure washer attachment and dimensional control (±0.03 mm), while rolled threads promote even torque distribution for manual or semi-automated assembly lines. We also customize thread size, length, and finish to meet specific general-assembly requirements.

We maintain ample stock of standard socket head machine screws for quick delivery. Our quality control includes dimensional checks, washer adhesion, and torque testing, with a 99.9% pass rate. We provide tailored bulk packaging and expert selection advice. With competitive pricing and assembly efficiency, the product helps customers reduce general fastening costs and improve production throughput.