S-97832A331 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise alignment and smooth rotation ensured by the 3" shoulder with controlled diameter tolerance for reliable performance in assemblies.
• High-strength fastening with 70,000 psi tensile strength and 35,000 psi minimum shear strength, providing dependable load-bearing capacity.
• Fine UNF thread (Class 3A) offers excellent vibration resistance and secure clamping in precision applications.
• Easy installation and removal with a hex socket drive and knurled head for improved grip and torque application.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
• Consistent Rockwell B55 hardness maintains thread integrity and resistance to wear under repeated use.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and electronics where exposure to moisture or chemicals is common. The 3" shoulder length and precise shoulder diameter allow for accurate positioning of components, reducing misalignment and wear in rotating assemblies. Combined with a Class 3A UNF fine thread, it ensures tight, vibration-resistant connections in high-stress environments. The hex socket drive and knurled head facilitate quick assembly and disassembly, enhancing maintenance efficiency. Ideal for use in pivots, guides, and spacers, this screw delivers reliable performance and long-term value in demanding engineering setups.

Specification Summary & Compliance

This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision and strength. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 3" with a tolerance of -0.005" to 0.005", ensuring consistent dimensional accuracy. It meets ASME B18.3 specifications for manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental adherence for global industrial use.