S-97768A485 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
• Precise component alignment ensured by a 1-1/2" shoulder with tight diameter tolerance for stable positioning in assemblies.
• High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
• Reliable thread engagement with Class 3A fit and 1/2"-13 UNC coarse threads, reducing cross-threading risks.
• Secure, non-slip installation via a knurled hex socket head, allowing high torque application without slippage.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
• Enhanced durability from Rockwell B55 hardness, providing long service life under mechanical stress.

Professional Applications & Engineering Value

This 1/2"-13 UNC shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 18-8 Stainless Steel material, combined with a Black Oxide finish, offers excellent resistance to rust and wear, making it suitable for moist or corrosive settings. The 1-1/2" shoulder provides a stable, unthreaded bearing surface that maintains precise part spacing and reduces wear on mating components. With a coarse thread design and Class 3A thread fit, it ensures quick assembly and high clamping force, minimizing the risk of loosening under vibration. Ideal for use in pivots, rotating shafts, and jig fixtures, this screw delivers reliable performance in heavy-duty applications where strength and accuracy are paramount.

Specification Summary & Compliance

The screw features a 1/2"-13 UNC thread with Class 3A fit for precise thread engagement, and a shoulder diameter of 5/8" with tight tolerances (-0.004" to -0.002") to ensure accurate alignment. It is manufactured in accordance with ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substances.