S-91259A487 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional durability with alloy steel construction and 140,000 psi tensile strength for reliable performance in demanding industrial environments
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh conditions
• Precise alignment and positioning enabled by the 1/2" shoulder diameter with tight tolerance control
• Secure fastening through Class 3A UNC threads ensuring excellent thread engagement and vibration resistance
• Easy installation and removal with hex socket drive and knurled head for improved grip during assembly
• Industry compliance meeting ASME B18.3 and ASTM A574 specifications for quality assurance
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

This shoulder screw delivers critical engineering value in applications requiring precise component positioning and rotational movement. The alloy steel construction with Rockwell C32 hardness provides the necessary strength to withstand high-stress conditions in machinery, automotive assemblies, and industrial equipment. The 3/8"-16 UNC coarse threads with Class 3A fit ensure rapid assembly while maintaining vibration resistance, reducing maintenance downtime. The black oxide finish offers enhanced corrosion protection, making it suitable for environments where moisture or chemicals are present. The combination of the 1/2" shoulder diameter with controlled tolerances and the hex socket drive enables precise alignment of moving parts while facilitating easy installation in confined spaces, solving common challenges in precision mechanical assemblies and rotating mechanisms.

Specification Summary & Compliance

This shoulder screw features precision 3/8"-16 UNC Class 3A threads with coarse spacing, ensuring optimal engagement and strength. The shoulder diameter maintains tight tolerances (-0.004" to -0.002") while the shoulder length tolerance is controlled within -0.005" to 0.005" for consistent performance. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, this fastener delivers reliable mechanical properties including 140,000 psi tensile strength and Rockwell C32 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across various industrial applications.