S-97832A277 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 environments and extended service life.
• Enhanced torque transmission and grip from the knurled socket head and 3/16" hex drive, preventing tool slippage during installation.
• Precise component alignment and spacing ensured by the consistent 3/8" shoulder diameter and 5/8" shoulder length with tight tolerances.
• High mechanical strength and reliability with a tensile strength of 70,000 psi and Rockwell B55 hardness for demanding applications.
• Secure and precise thread engagement due to the Class 3A thread fit and coarse 1/4"-20 UNC thread, reducing the risk of cross-threading.
• Compliance with industry standards including ASME B18.3, ensuring consistent quality, interchangeability, and performance.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and pivot point requirements in industrial applications. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for machinery, automotive assemblies, and equipment exposed to moisture or chemicals. The knurled socket head and hex drive design offer superior torque application, minimizing the risk of stripping and ensuring secure fastening in high-vibration environments. The precision-machined shoulder acts as a reliable bearing surface or axle, maintaining exact spacing between components. With its Class 3A thread fit and coarse UNC thread, it enables quick assembly and disassembly while providing strong holding power, reducing downtime and improving maintenance efficiency in production lines and precision instruments.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precise engagement. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 5/8" with a tolerance of -0.005" to 0.005", ensuring dimensional accuracy. It is manufactured in compliance with ASME B18.3 standards and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations.