S-91327A296 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker that maintains integrity across a wide temperature range from -50° to 250°F
• Superior corrosion resistance from 18-8 stainless steel construction with passivated finish for extended service life in harsh environments
• Precision alignment and bearing surfaces thanks to controlled 3/16" shoulder diameter with tight tolerance for accurate component positioning
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
• Reliable thread engagement through Class 3A thread fit and UNC 8-32 coarse threads ensuring secure fastening in various materials
• Easy installation and removal with standard hex socket drive (3/32") allowing efficient maintenance and assembly operations
• Industry compliance assurance meeting ASME B18.3 specifications and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This stainless steel shoulder screw delivers exceptional engineering value in precision assemblies where alignment, durability, and vibration resistance are critical. The 18-8 stainless steel material with passivated finish provides excellent corrosion resistance for harsh industrial environments, while the permanent nylon patch thread locker prevents loosening under dynamic loads and thermal cycling from -50° to 250°F. The precisely machined 3/16" shoulder diameter with controlled tolerance serves as an accurate locating feature in machinery, pivots, and rotating assemblies. With UNC 8-32 coarse threads and Class 3A thread fit, this fastener ensures reliable engagement in various substrates, making it ideal for automotive components, industrial equipment, and precision instruments requiring maintained alignment under stress.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with UNC 8-32 coarse threads and controlled shoulder dimensions (3/16" diameter with -0.004" to -0.002" tolerance). Manufactured to ASME B18.3 specifications, the fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The combination of 70,000 psi tensile strength, Rockwell B55 hardness, and permanent nylon patch thread locker ensures reliable performance across industrial applications while maintaining regulatory compliance.