S-91273A491 M16 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel, ideal for harsh industrial environments and reducing replacement frequency.
• Precise alignment and secure positioning due to the 40mm shoulder with tight length tolerance (0 to 0.25 mm), minimizing assembly play.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength, ensuring reliable performance under stress.
• Easy installation and removal using the 8 mm hex drive and knurled head, providing excellent grip even with gloves or oily conditions.
• Accurate and durable thread engagement with Class 5g6g metric coarse thread (M16x2mm), resisting loosening in vibrating applications.
• Consistent dimensional stability from Rockwell B55 hardness, maintaining thread and shoulder integrity over repeated use.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use in regulated markets.

Professional Applications & Engineering Value

This M16x2mm shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel construction offers excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive assemblies, and outdoor equipment where exposure to moisture or chemicals is common. The 40mm precision shoulder provides a stable bearing surface for rotating parts like gears, pulleys, or linkages, reducing wear and ensuring accurate concentricity. Combined with the Class 5g6g thread fit and coarse thread pitch, it facilitates quick assembly while maintaining a secure hold in high-vibration environments. The knurled socket head enhances tool engagement, speeding up maintenance and reducing downtime. Ideal for precision alignment in jigs, fixtures, and conveyors, this screw delivers long-term reliability and performance.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M16x2mm coarse thread and Class 5g6g thread fit for precise tolerance. The shoulder diameter is 16 mm with a tolerance of -0.04 to -0.01 mm, and shoulder length is 40 mm with a tolerance of 0 to 0.25 mm, ensuring consistent dimensional accuracy. It is manufactured from 18-8 stainless steel with a hardness of Rockwell B55, tensile strength of 70,000 psi, and minimum shear strength of 35,000 psi. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use.