S-90278A718 M1.6 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment ensured by the 16mm shoulder with a tight diameter tolerance, minimizing assembly play and vibration.
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Secure and repeatable fastening with a Class 6g thread fit and M1.6x0.35mm coarse thread for quick assembly and consistent clamping force.
• Easy installation in confined spaces using the standard hex socket (1.5mm drive), allowing for high torque application with common tools.
• Regulatory compliance and safety meeting RoHS 3 and REACH standards, ensuring material safety for global industrial use.
• Durable and smooth operation from the smooth head texture and right-hand thread, reducing wear during installation and maintenance.

Professional Applications & Engineering Value

This M1.6 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for electronics, medical devices, and automation equipment exposed to moisture or chemicals. The 16mm precise shoulder length acts as a pivot or spacer, ensuring accurate positioning of moving parts like gears and bearings, which reduces wear and prevents misalignment. With a Class 6g thread fit and coarse thread spacing, it offers quick installation and reliable holding power in high-vibration environments. The hex drive and socket head design allow for secure tightening in tight spaces, enhancing assembly efficiency and reducing downtime in industrial maintenance and manufacturing lines.

Specification Summary & Compliance

This metric shoulder screw features a thread size of M1.6 with a 0.35mm pitch and Class 6g thread fit per ISO standards, ensuring dimensional accuracy. The shoulder diameter is 2.5 mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 16 mm with a tolerance of 0 to 0.05 mm for precise shoulder fit. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for safe, industrial use worldwide.