S-91273A302 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ensuring long-term reliability in harsh industrial environments
• Precise component alignment through Class 2A thread fit and standardized shoulder diameter, reducing assembly time and improving mechanical performance
• Enhanced grip and torque application with knurled head and hex socket drive, preventing slippage during installation
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength, suitable for demanding applications
• Consistent dimensional accuracy with controlled shoulder length and diameter tolerances, ensuring repeatable fit in precision assemblies
• Environmental compliance assurance meeting RoHS 3 and REACH standards, making it suitable for regulated industries
• Optimized for coarse thread applications with UNC 1/4"-20 threading, providing quick assembly and disassembly in right-hand thread configurations

Professional Applications & Engineering Value

This stainless steel shoulder screw delivers exceptional engineering value in precision mechanical systems where alignment and durability are critical. The 18-8 stainless steel composition provides excellent corrosion resistance, making it ideal for manufacturing equipment, automation systems, and outdoor applications. The 3/8" shoulder length and 1/4" shoulder diameter create a precise pivot point or spacer in assemblies, eliminating the need for additional components. The knurled head texture combined with hex drive ensures secure tool engagement during high-torque installations, while the Class 2A thread fit maintains consistent engagement in UNC coarse thread applications. These features collectively address common industrial challenges including misalignment, component wear, and assembly inefficiency.

Specification Summary & Compliance

This precision shoulder screw maintains Class 2A thread fit per UNC standards with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. The mechanical properties include Rockwell B55 hardness and standardized shoulder fit for consistent performance in industrial applications.