S-92981A916 M12 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability: Alloy steel construction with Rockwell C32 hardness and 140,000 psi tensile strength ensures reliable performance in demanding industrial environments.
• Superior Corrosion Resistance: Black oxide finish provides excellent protection against rust and oxidation, extending service life in harsh conditions.
• Precise Shoulder Alignment: 16mm shoulder diameter with tight tolerance (-0.072 to -0.01 mm) ensures accurate component positioning and reduces assembly errors.
• Secure Fastening: Class 5g6g thread fit with M12x1.75 coarse pitch enables quick installation and maintains vibration resistance in high-stress applications.
• Effortless Installation: Hex socket drive (8mm) combined with knurled head texture offers superior grip and torque transmission, reducing tool slippage.
• Regulatory Compliance: Meets ASTM A108 specifications and is RoHS 3 & REACH compliant, ensuring environmental and safety standards for global industrial use.
• Versatile Shoulder Design: 10mm shoulder length provides stable bearing surface for rotating components, minimizing wear and simplifying machinery assembly.

Professional Applications & Engineering Value

This M12 shoulder screw delivers critical engineering solutions where precision alignment and high load capacity are paramount. The alloy steel core, hardened to Rockwell C32, withstands extreme mechanical stresses in automation equipment, conveyor systems, and precision machinery. The black oxide finish combats corrosion in humid or chemical-exposed environments, while the knurled hex socket head ensures secure tool engagement during high-torque assembly. With its Class 5g6g metric thread and coarse 1.75mm pitch, it facilitates rapid installation in metal fabrication and reduces the risk of cross-threading. The precisely machined shoulder acts as a reliable axle or pivot point, eliminating the need for additional spacers in robotics and assembly jigs, streamlining production and maintenance workflows.

Specification Summary & Compliance

This shoulder screw maintains ISO-compliant Class 5g6g thread tolerances with an M12x1.75 coarse thread profile. Shoulder diameter tolerance is controlled between -0.072 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm for consistent fit. Manufactured in accordance with ASTM A108 standards, it is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting international environmental and safety regulations for industrial components.