S-91264A587 5/16"-18 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Secure vibration-resistant locking with integrated nylon pellet that maintains integrity across a wide temperature range from -50° to 250°F
• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for demanding applications
• Precision shoulder alignment featuring 1-1/2" shoulder length with tight ±0.005" tolerance for accurate component positioning
• Enhanced durability and corrosion resistance through Rockwell C32 hardened alloy steel with black oxide finish
• Reliable thread engagement with Class 3A UNC coarse threads ensuring consistent fastening performance
• Easy installation and removal with standard hex socket drive and knurled head for improved grip during handling
• Industry-standard compliance meeting ASME B18.3 and ASTM A574 specifications for guaranteed quality

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment where component alignment and rotational movement are paramount. The 1-1/2" shoulder length with minimal tolerance provides exact pivot points and bearing surfaces in assemblies, eliminating the need for additional bushings or spacers. The nylon pellet thread locking technology prevents loosening under vibration, making it ideal for automated systems, conveyor mechanisms, and rotating assemblies. The black oxide finish enhances corrosion resistance while maintaining dimensional stability, and the UNC coarse threads ensure rapid assembly in production environments. With Rockwell C32 hardness and high tensile strength, this fastener withstands repeated cycling and heavy loads without deformation.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, this shoulder screw features Class 3A thread fit for precision engagement and shoulder diameter tolerance of -0.004" to -0.002". The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. The right-hand UNC 5/16"-18 coarse threads provide optimal performance in industrial fastening applications requiring high strength and reliability.