S-91290A085 M4 x 75 mm DIN 912 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with Class 12.9 strength rating and 170,000 psi tensile strength for reliable performance in high-stress environments.
• Enhanced corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial conditions.
• Secure and precise torque application enabled by the 3 mm hex socket drive, reducing tool slippage and fastener damage.
• Optimized thread engagement with a partially threaded design and 20 mm minimum thread length for stable clamping in varied material thicknesses.
• Superior hardness and durability with Rockwell C37 hardness, resisting wear and deformation under repeated use.
• Broad compatibility and easy installation thanks to the metric coarse thread (M4 x 0.7 mm) and right-hand thread direction, conforming to common assembly practices.
• Regulatory peace of mind with compliance to DIN 912, RoHS 3, and REACH, ensuring safe and sustainable use in global markets.

Professional Applications & Engineering Value

This M4 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 minimizes rust and oxidation in humid or chemically exposed settings, while the Class 12.9 strength rating ensures it withstands extreme tensile and shear forces. The partially threaded profile with a coarse thread (0.7 mm pitch) allows for rapid installation and reliable grip in metals, plastics, and composites, making it ideal for machinery, automotive components, and precision equipment. By integrating a hex socket drive (3 mm), it enables high-torque tightening in confined spaces, reducing assembly time and improving joint integrity. These features collectively enhance operational safety and reduce maintenance needs in heavy-duty applications.

Specification Summary & Compliance

This screw adheres to DIN 912 specifications, with precise metric thread dimensions (M4 x 0.7 mm) and a Class 5g6g thread fit for consistent engagement. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of hazardous substances. The partially threaded design, with a minimum thread length of 20 mm and overall length of 75 mm, supports standardized industrial use, while the right-hand thread direction and coarse thread spacing align with global fastener conventions.