S-91259A722 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by the black oxide finish, extending service life in demanding industrial environments
• Precision shoulder fit with controlled diameter and length tolerances ensures accurate alignment and smooth rotational movement
• Enhanced grip and torque application through the knurled socket head design with standard hex drive profile
• Optimized thread engagement with Class 3A UNC coarse threads for secure fastening and vibration resistance
• Industry-standard compliance meeting ASME B18.3 and ASTM A574 specifications for guaranteed quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use across regulated industries

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment where alignment accuracy and rotational stability are paramount. The precisely machined 1/2" shoulder diameter with tight tolerances serves as a reliable locating surface for bearings, gears, and rotating components, eliminating the need for additional spacers or alignment fixtures. The black oxide finish provides essential corrosion protection while maintaining dimensional stability in harsh operating conditions. With its 3/8"-16 UNC thread configuration and Class 3A fit, this fastener ensures secure mounting while the knurled socket head design facilitates easy installation and removal in confined spaces. Ideal for precision assemblies in automation systems, manufacturing equipment, and motion control applications where dimensional accuracy and repeatable performance are critical.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with UNC coarse thread profile, manufactured to ASME B18.3 specifications and ASTM A574 material standards. The shoulder maintains tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications while meeting international quality standards.