S-91273A177 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction for long-lasting performance in harsh industrial environments
• Precise component alignment thanks to the 5/8" shoulder with tight diameter tolerance for reduced assembly vibration and wear
• High-strength reliability with 70,000 psi tensile strength and 35,000 psi shear strength to withstand demanding mechanical loads
• Secure, non-slip installation featuring a knurled head and 5/32" hex socket drive for positive grip during torque application
• Optimized thread engagement with UNC coarse 5/16"-18 thread and Class 2A fit ensuring consistent fastening in various materials
• Enhanced durability from Rockwell B55 hardness providing excellent resistance to deformation under stress
• Global compliance readiness meeting RoHS 3 and REACH regulations for international industrial applications

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw delivers critical engineering solutions where precision alignment and rotational stability are paramount. The 5/8" shoulder length with controlled diameter tolerance serves as an accurate pivot or spacer in machinery, preventing lateral movement in bearings, gears, and linkages. The UNC coarse thread with Class 2A fit provides rapid assembly in soft metals and plastics while maintaining clamping force. The combination of 70,000 psi tensile strength and corrosion-resistant stainless steel makes it ideal for food processing equipment, automotive jigs, and packaging machinery exposed to moisture and chemicals. The hex socket drive with knurled head ensures tool engagement security in high-vibration environments, reducing installation errors and maintenance downtime.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and shoulder diameter tolerance of -0.004" to -0.002". Features 5/16"-18 UNC coarse thread with 7/16" thread length and 5/8" shoulder length. Mechanical properties include Rockwell B55 hardness, 70,000 psi tensile strength, and 35,000 psi minimum shear strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for hazardous substance restrictions.