S-97768A303 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and black oxide finish for long-lasting performance in harsh environments
• Precise component alignment with 7/16" shoulder length and controlled diameter tolerance for accurate positioning in assemblies
• Superior thread reliability with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure installation and removal with hex socket drive and knurled head providing excellent grip and torque transmission
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 UNC shoulder screw delivers critical engineering value in precision assemblies where component alignment and rotational control are paramount. The 18-8 stainless steel construction with black oxide finish provides excellent corrosion resistance while maintaining the material's inherent strength characteristics. The precisely machined 7/16" shoulder length serves as a reliable locating diameter for bearings, gears, and linkages, eliminating the need for additional spacing components. The Class 3A thread fit ensures consistent engagement in threaded holes, while the hex socket drive with knurled head enables secure installation in confined spaces. These shoulder screws are engineered to withstand rotational forces and maintain alignment in machinery, automation systems, and precision equipment where dimensional stability under load is critical.

Specification Summary & Compliance

This shoulder screw features 1/4"-20 UNC coarse threads with Class 3A fit for precise thread engagement. The shoulder diameter maintains tight tolerance of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005" for accurate component positioning. Manufactured from 18-8 stainless steel with Rockwell B55 hardness, delivering 70,000 psi tensile strength and 35,000 psi minimum shear strength. The product complies with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for restricted substance compliance.