S-91290A442 M8 x 40 mm DIN 912, ISO 4762 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Class 12.9 strength rating and 170,000 psi tensile strength for reliable performance in high-stress applications.
• Superior corrosion resistance from the black-oxide coating on alloy steel, extending service life in harsh industrial environments.
• Precise torque application enabled by the 6 mm hex socket drive, reducing tool slippage and ensuring secure fastening.
• Optimized thread engagement with M8 x 1.25 mm coarse thread and Class 5g6g fit, facilitating quick assembly and vibration resistance.
• Versatile partial threading (28 mm min thread length on 40 mm screw) allows for adjustable clamping force and easy alignment.
• High hardness of Rockwell C37 minimizes wear and deformation under heavy loads, maintaining fastener integrity.
• Global compliance with DIN 912/ISO 4762 standards ensures interchangeability and quality for international engineering projects.

Professional Applications & Engineering Value

This M8 socket head cap screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and material fatigue. The black-oxide alloy steel construction provides a protective layer that resists rust and oxidation, making it ideal for machinery, automotive, and construction applications exposed to moisture or chemicals. With a coarse thread (1.25 mm pitch) and partial threading, it offers faster installation and reduced risk of cross-threading compared to fine-thread alternatives. The hex socket drive allows for high-torque tightening in confined spaces, ensuring stable connections in heavy-duty equipment. By meeting DIN 912/ISO 4762 specifications, it guarantees dimensional accuracy and reliability, supporting efficient maintenance and reducing downtime in B2B operations.

Specification Summary & Compliance

This product adheres to precise metric dimensions, including a thread size of M8 x 1.25 mm with Class 5g6g thread fit for consistent tolerance. It conforms to DIN 912 (identical to ISO 4762) for socket head cap screws, ensuring standardized head profile and drive compatibility. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms it is free from hazardous substances, suitable for environmentally conscious industrial use. The strength classification of Class 12.9 and material hardness further validate its performance in high-stress scenarios.