S-91259A632 5/16"-18 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for demanding industrial applications
• Precise alignment and positioning thanks to the 2" shoulder length with tight tolerances for consistent performance
• Enhanced corrosion resistance through black oxide finish that protects against rust in harsh environments
• Reliable thread engagement with Class 3A fit UNC coarse threads ensuring secure fastening in high-vibration settings
• Easy installation and removal with hex socket drive and knurled head for superior grip during assembly
• Long-term durability from alloy steel construction with Rockwell C32 hardness for extended service life
• Industry compliance assurance meeting ASME B18.3 and ASTM A574 specifications for quality and reliability

Professional Applications & Engineering Value

This alloy steel shoulder screw with black oxide finish provides critical engineering solutions for precision machinery and industrial equipment. The 2" shoulder length with controlled tolerances ensures accurate component alignment in rotating assemblies, pivot points, and guide mechanisms, eliminating the need for additional spacers or bushings. The 5/16"-18 UNC coarse thread with Class 3A fit delivers superior thread engagement in high-vibration environments, while the hex socket drive and knurled head facilitate secure installation in confined spaces. Engineered for industrial shoulder bolt applications requiring both structural support and rotational functionality, this component reduces assembly time while maintaining precise dimensional control in automotive, manufacturing, and heavy equipment sectors.

Specification Summary & Compliance

This precision shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for superior thread engagement, combined with a 2" shoulder length maintaining tight diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, the component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.