S-97832A282 1/4"-20 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 washdown applications.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high-stress conditions.
• Precise alignment and smooth rotation enabled by the 3/8" diameter shoulder with controlled tolerances, reducing wear on mating parts.
• Secure, high-torque installation using the 3/16" hex socket drive and knurled head, which provides excellent grip and prevents tool slippage.
• Guaranteed interchangeability and fit with Class 3A thread fit and UNC coarse threading, ensuring consistent assembly and reducing the risk of cross-threading.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring product safety and environmental responsibility.
• Durable, long-lasting performance with a Rockwell B55 hardness, providing excellent resistance to deformation and wear over time.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and pivot point requirements in demanding assemblies. The 1/4"-20 UNC coarse thread and 3/4" thread length provide robust fastening, while the unthreaded shoulder (3/8" diameter, 1-1/4" length) acts as a precise datum for locating gears, pulleys, and linkages, minimizing radial play and eccentric motion. The hex socket drive and knurled head facilitate installation in confined spaces and high-torque applications, preventing cam-out. Its Class 3A thread fit ensures vibration resistance and leak-free performance in machinery, automotive, and conveyor systems, solving common issues of misalignment and premature wear in rotating assemblies.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit per ASME B18.3, with a shoulder diameter tolerance of -0.004" to -0.002" and a shoulder length tolerance of -0.005" to 0.005" for precision assembly. It is manufactured in compliance with ASME B18.3 specifications and is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant.