S-92981A949 M1.6 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides reliable protection against rust and wear in demanding industrial environments.
• Precise Shoulder Alignment: 18mm shoulder length with tight tolerances ensures accurate component positioning and reduces assembly errors.
• High-Strength Fastening: Alloy steel construction with Rockwell C32 hardness delivers excellent load-bearing capacity and long-term reliability.
• Secure Hex Drive Engagement: 1.5mm hex socket head allows for high-torque installation without stripping, ensuring consistent clamping force.
• Optimized Thread Performance: Class 5g6g thread fit with coarse 0.35mm pitch enables quick assembly and vibration resistance in dynamic applications.
• Broad Regulatory Compliance: Meets ASTM A108, RoHS 3, and REACH standards for safe use in regulated industries and international markets.
• Versatile Metric Design: M1.6x0.35mm right-hand thread with standard shoulder profile facilitates compatibility with global equipment and tooling.

Professional Applications & Engineering Value

This M1.6 shoulder screw is engineered to address critical alignment and stability challenges in precision assemblies. The alloy steel core, hardened to Rockwell C32, withstands repetitive stress in automated machinery, while the black oxide finish minimizes friction and oxidative degradation. The 18mm shoulder length acts as a precise pivot or spacer in electromechanical devices, reducing part wobble and simplifying maintenance. Its Class 5g6g thread fit and coarse pitch ensure rapid installation in robotics, optical instruments, and miniature actuators, where vibration loosening can compromise safety. By integrating a hex drive socket, it enables tool access in confined spaces, making it ideal for high-volume production lines requiring repeatable, error-free fastening.

Specification Summary & Compliance

This shoulder screw maintains tight dimensional control with a shoulder diameter tolerance of -0.072 to -0.01 mm and length tolerance of 0 to 0.25 mm. Threads conform to Metric coarse (0.35mm pitch) standards with a Class 5g6g fit for consistent engagement. Manufacturing follows ASTM A108 specifications, and the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for electronics, automotive, and aerospace applications.