S-90298A814 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress loads.
• Precise alignment and smooth rotation enabled by the 5" shoulder with controlled diameter tolerance for consistent assembly.
• Secure, high-torque installation using the 5/16" hex socket drive and knurled head for superior grip and reduced tool slippage.
• Accurate and reliable threading with Class 3A UNC coarse threads ensuring tight, vibration-resistant fits in demanding applications.
• Compliance with rigorous industry standards including ASME B18.3, guaranteeing dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance for use in regulated global markets.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to solve critical alignment and pivot point challenges in machinery and automation. The 5" shoulder length provides a precise, unthreaded bearing surface that supports rotating components like gears, pulleys, and linkages, minimizing wear and maintaining concentricity. The 1/2"-13 UNC Class 3A thread offers a coarse, high-strength fastening solution that resists loosening under vibration, common in assembly lines and heavy equipment. Manufactured from 18-8 Stainless Steel with a Rockwell B55 hardness, it delivers excellent corrosion resistance and durability, making it suitable for food processing, packaging, and outdoor applications where reliability is non-negotiable. The knurled head and hex socket drive ensure secure handling during installation, reducing assembly time and improving operator safety.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, ensuring dimensional consistency. The UNC coarse thread is manufactured to Class 3A tolerances for a secure, precise fit. The shoulder features a diameter tolerance of -0.004" to -0.002" and a length tolerance of -0.005" to 0.005" for exacting alignment. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial use without hazardous substances.