S-91273A606 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel material, ensuring long-term reliability in harsh environments
• Enhanced durability and wear resistance with black oxide finish that reduces galling and provides additional corrosion protection
• Precise component alignment through the 2 3/4" shoulder length with tight tolerances for accurate positioning in assemblies
• High load-bearing capacity with 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 for improved grip during torque application
• Reliable thread engagement through Class 2A thread fit and coarse UNC threads that resist loosening under vibration
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This high-strength shoulder screw delivers exceptional engineering value in precision mechanical assemblies where accurate alignment and rotational movement are critical. The 18-8 stainless steel construction with black oxide finish provides excellent corrosion resistance while maintaining the material's inherent strength properties. The precisely machined 2 3/4" shoulder length with tight diameter tolerance ensures proper bearing surfaces and pivot points in machinery, reducing wear on mating components. The 5/16"-18 UNC coarse threads with Class 2A fit offer reliable fastening in high-vibration environments common in industrial equipment, automotive assemblies, and manufacturing machinery. The combination of Rockwell B55 hardness and 70,000 psi tensile strength makes this shoulder screw ideal for applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

This precision shoulder screw features 5/16"-18 UNC coarse threads with Class 2A thread fit for consistent engagement. The shoulder diameter maintains tight tolerance of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005" for precise dimensional control. Manufactured from 18-8 stainless steel with black oxide finish, the screw delivers 70,000 psi tensile strength and 35,000 psi minimum shear strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and safety in industrial applications.