S-91273A301 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Corrosion-resistant 18-8 stainless steel construction ensures long-term durability in harsh industrial environments
• Precision Class 2A thread fit guarantees consistent engagement and reliable fastening performance
• 70,000 psi tensile strength provides exceptional load-bearing capacity for heavy-duty applications
• Knurled head with hex socket drive offers superior grip and torque transmission during installation
• 3/8" shoulder length with tight diameter tolerance enables precise component alignment and pivot point functionality
• RoHS 3 and REACH compliance meets international environmental regulations for global manufacturing
• Coarse UNC threading facilitates quick assembly and disassembly in maintenance operations

Professional Applications & Engineering Value

This socket head shoulder screw with 1/4"-20 UNC coarse threads and 3/8" shoulder length delivers critical engineering solutions for precision machinery and industrial equipment. The 18-8 stainless steel composition provides excellent corrosion resistance, making it ideal for manufacturing environments exposed to moisture, chemicals, or temperature variations. The precisely machined shoulder diameter of 1/4" with controlled tolerances serves as a reliable locating surface for rotating components, bearings, and linkages, eliminating the need for additional spacers or bushings. The hex socket drive combined with the knurled head texture ensures secure tool engagement, preventing cam-out during high-torque applications while facilitating installation in confined spaces common in assembly lines and automated systems.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2A thread fit for consistent fastening performance. The shoulder features precise dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Mechanical properties include Rockwell B55 hardness and 70,000 psi tensile strength with minimum shear strength of 35,000 psi. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring strict material restrictions.