S-97832A311 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by the 5/16" shoulder diameter with tight tolerance control
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Superior thread reliability with Class 3A UNC coarse threads providing secure fastening in high-vibration settings
• Easy installation and removal featuring a knurled hex socket head for improved grip and torque application
• Extended service life backed by Rockwell B55 hardness for excellent wear resistance and durability
• Regulatory compliance assurance meeting ASME B18.3 standards with RoHS 3 and REACH environmental directives

Professional Applications & Engineering Value

This 1/4"-20 UNC shoulder screw delivers critical engineering value in precision assembly applications where component alignment and rotational control are paramount. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining high tensile strength in demanding environments. The 7/8" shoulder length with controlled tolerances ensures precise spacing between components, eliminating the need for additional spacers in machinery, automation systems, and precision instruments. The knurled hex socket head design allows for secure tool engagement during installation, reducing slippage in high-torque applications. These shoulder screws are particularly valuable in rotating assemblies, pivot points, and gear mechanisms where the shoulder acts as a bearing surface, providing smooth operation and extended service life in industrial equipment.

Specification Summary & Compliance

This precision shoulder screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for superior engagement and holding power. The shoulder maintains tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance standards. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.