S-90358A031 M8 x 40 mm Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Rockwell C32 hardness and 140,000 psi tensile strength for reliable performance in demanding applications
• Precise thread engagement with Class 5g6g fit ensuring consistent assembly and reduced risk of cross-threading
• Space-saving ultra-low socket head profile allows installation in confined areas while maintaining full hex drive engagement
• Corrosion-resistant black-oxide finish on alloy steel provides enhanced protection against environmental factors
• Optimized drive efficiency with 5mm hex socket delivering maximum torque transfer and reduced tool slippage
• Full thread coverage along the 40mm length enables flexible positioning and secure fastening throughout the engagement area
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

These M8 socket head cap screws deliver critical engineering solutions where space constraints meet high-strength requirements. The black-oxide alloy steel construction combined with Class 5g6g thread fit provides exceptional resistance to vibration loosening and mechanical stress in industrial machinery, automotive assemblies, and precision equipment. The ultra-low socket head profile enables flush mounting in compact designs while maintaining full torque capability through the 5mm hex drive. With 140,000 psi tensile strength and controlled length tolerance, these metric coarse thread screws ensure reliable performance in high-stress applications where fastener failure is not an option, from production fixtures to heavy-duty equipment maintenance.

Specification Summary & Compliance

Manufactured to precise metric standards with M8 x 1.25mm coarse threads and Class 5g6g thread fit tolerance. Length maintained within -0.127mm to 0.127mm tolerance for consistent installation. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment on alloy steel provides corrosion resistance while maintaining the material's inherent strength characteristics.