S-91264A628 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: Withstands up to 140,000 psi tensile and 84,000 psi shear strength, ensuring reliable performance in high-stress industrial applications.
• Secure Vibration-Resistant Locking: Integrated nylon pellet thread locker maintains fastener integrity across a wide temperature range from -50° to 250°F, preventing loosening under dynamic loads.
• Precision Thread Fit: Class 3A UNC coarse threads provide superior engagement and alignment, reducing assembly time and improving joint reliability.
• Enhanced Durability & Corrosion Resistance: Black oxide finish on alloy steel substrate offers improved wear resistance and protection in demanding environments.
• Optimized Shoulder Design: 1-1/2" shoulder with tight diameter tolerance provides accurate component positioning and rotational bearing surfaces.
• Easy Installation & Removal: Hex socket drive with knurled head allows for secure tool engagement and manual adjustment in confined spaces.
• Industry Compliance Assurance: Manufactured to ASME B18.3 and ASTM A574 specifications, meeting rigorous quality standards for industrial applications.

Professional Applications & Engineering Value

This high-strength shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment where alignment accuracy and vibration resistance are paramount. The alloy steel construction with Rockwell C32 hardness provides the structural integrity needed for rotating assemblies, pivot points, and locating applications. The 1-1/2" shoulder length with precise diameter tolerance serves as an accurate axle or dowel for gears, pulleys, and linkages, eliminating the need for additional bushings. The nylon pellet thread locker embedded in the 3/8"-16 UNC coarse threads ensures maintained clamp force in vibrating environments from automotive assemblies to production machinery. The black oxide finish enhances corrosion resistance while the hex socket drive with knurled texture facilitates installation in space-constrained applications, making this shoulder screw ideal for OEM manufacturing, industrial automation, and heavy equipment maintenance.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with UNC coarse thread profile, manufactured to ASME B18.3 specifications using ASTM A574 alloy steel. The shoulder diameter maintains tight tolerance of -0.004" to -0.002" with shoulder 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 global industrial markets.