S-97832A284 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
• Precise component alignment thanks to the 3/8" shoulder diameter with tight tolerance control for reduced assembly vibration
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
• Secure, slip-resistant installation with knurled socket head and 3/16" hex drive for reliable torque transfer
• Consistent thread engagement ensured by Class 3A thread fit and 1/4"-20 UNC coarse thread for quick assembly
• Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interchangeability and quality
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, making it suitable for applications in machinery, automotive, and electronics where environmental factors are a concern. The 3/8" shoulder diameter acts as a precise pivot or bearing surface, eliminating the need for additional spacers and reducing component count. Combined with the Class 3A thread fit and coarse UNC thread, it ensures rapid, secure fastening in high-vibration environments. The knurled socket head with hex drive offers superior grip during installation, preventing tool slippage and maintaining torque accuracy. Ideal for use in rotating assemblies, pivoting mechanisms, and precision fixtures, this screw enhances equipment reliability and reduces maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precise tolerance. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and shoulder length is 1 1/2" with tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both dimensional accuracy and material safety for industrial use.