S-8077A831 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and black oxide finish, ideal for harsh industrial environments
• Precise alignment and reduced assembly wear through knurled head texture and consistent 5/16" shoulder diameter
• High-load bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Reliable thread engagement with Class 3A thread fit and UNC coarse threads ensuring vibration resistance
• Easy installation and removal using standard 5/32" hex drive socket head design
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
• Dimensional stability with tight shoulder diameter and length tolerances for precise component positioning

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw delivers exceptional engineering value in precision assembly applications where alignment accuracy and corrosion resistance are critical. The black oxide finish enhances surface durability while maintaining dimensional stability across temperature variations. Engineered with Class 3A thread fit and UNC coarse threads, it provides superior vibration resistance in machinery, automotive, and industrial equipment. The knurled head texture ensures secure handling during installation, while the precisely machined shoulder maintains component spacing in rotating assemblies, pivoting mechanisms, and bearing mounts. Its combination of high tensile strength and environmental compliance makes it ideal for medical equipment, food processing machinery, and marine applications where reliability and regulatory adherence are paramount.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit precision and UNC 1/4"-20 thread specifications. Shoulder dimensions maintain tight tolerances: diameter 5/16" (-0.004" to -0.002") and length 1/4" (-0.005" to +0.005"). Fully compliant with ASME B18.3 mechanical specifications, RoHS 3 (2015/863/EU) hazardous substance restrictions, and REACH (EC 1907/2006) chemical regulations. Material hardness certified at Rockwell B79 with verified mechanical properties.