S-90324A064 8-32 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 alignment and secure positioning thanks to the 3/16" shoulder with tight diameter tolerance (-0.004" to -0.002")
• Enhanced installation grip with knurled socket head design preventing tool slippage during assembly
• Exceptional mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
• Reliable left-hand thread engagement with Class 3A UNC coarse threads ensuring vibration resistance in reverse-motion assemblies
• Consistent hardness and durability with Rockwell B55 rating maintaining structural integrity under repeated loads
• Global compliance assurance meeting RoHS 3 and REACH regulations for safe use in international markets

Professional Applications & Engineering Value

This left-hand thread shoulder screw solves critical alignment and reverse-threading challenges in precision machinery, automation systems, and rotating equipment. The 18-8 stainless steel construction provides excellent corrosion resistance while the 3/16" shoulder length with controlled tolerances ensures precise component spacing and radial support. Engineers benefit from the Class 3A thread fit combined with UNC coarse threads that maintain secure fastening in high-vibration environments where standard right-hand threads would loosen. The knurled socket head with hex drive enables secure tool engagement during installation, preventing cam-out in confined spaces. These features make it ideal for applications requiring reliable positioning in manufacturing equipment, medical devices, and aerospace assemblies where reverse-motion prevention is critical.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. The combination of 70,000 psi tensile strength and Rockwell B55 hardness confirms consistent performance meeting industrial fastener requirements for critical applications.