S-94128A172 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior load-bearing capability with high-strength alloy steel construction and Rockwell C32 hardness for extended service life in demanding applications
• Exceptional precision alignment ensured by the precisely machined 3/8" shoulder diameter with tight -0.001" to 0" tolerance for minimal play
• Reliable component positioning thanks to the controlled 3/4" shoulder length with 0" to 0.005" tolerance for consistent assembly
• Secure fastening performance delivered by 5/16"-18 UNC Class 3A coarse threads with right-hand direction for vibration resistance
• Streamlined installation and removal with headless slotted drive design that accommodates standard tools in confined spaces
• Enhanced environmental compliance meeting RoHS 3 and REACH standards for use in regulated industries
• Optimized for high-volume production with consistent Class 3A thread fit that reduces assembly time and improves manufacturing efficiency

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering value in precision machinery and industrial equipment where exact component alignment is paramount. The headless design with slotted drive provides space-saving advantages while maintaining accessibility for maintenance. Engineered with Class 3A UNC coarse threading and precise shoulder dimensions, this fastener eliminates play in rotating assemblies, reduces wear on mating components, and maintains positional accuracy under dynamic loads. The Rockwell C32 hardness ensures the shoulder surface resists deformation when supporting bearings, gears, or linkages in automotive, aerospace, and manufacturing applications. This combination of exact shoulder diameter and length tolerances solves common alignment issues in assembly operations while the right-hand thread direction provides familiar installation for technicians.

Specification Summary & Compliance

This precision shoulder screw features 5/16"-18 UNC coarse threads with Class 3A fit for secure fastening. The shoulder maintains a diameter of 3/8" with -0.001" to 0" tolerance and length of 3/4" with 0" to 0.005" tolerance for precise component positioning. Manufactured from alloy steel with Rockwell C32 hardness, this fastener complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.