S-97345A831 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and demanding mechanical stress.
• Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal risk of loosening.
• Knurled head and 5/16" hex drive offer excellent grip and easy installation, even in tight spaces.
• Generous 3-inch shoulder length allows for accurate component alignment and smooth rotational movement.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.
• Coarse UNC threading enables quick assembly and disassembly, reducing maintenance time and labor costs.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to solve critical challenges in industrial applications where precision, strength, and corrosion resistance are paramount. The 1/2"-13 UNC coarse thread with a Class 3A fit ensures a tight, reliable connection that resists vibration-induced failure, making it ideal for machinery, automotive assemblies, and conveyor systems. The 3-inch shoulder provides a stable bearing surface for rotating parts, reducing wear and maintaining alignment in pivoting mechanisms. Its socket head with knurling facilitates secure tool engagement, speeding up installation in confined areas. Built to ASME B18.3 specifications, this screw delivers consistent performance in demanding environments, from marine equipment to food processing plants, where RoHS and REACH compliance ensures safety and durability.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with Class 3A precision tolerance, a shoulder diameter of 5/8" (tolerance: -0.004" to -0.002"), and a shoulder length of 3" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.