S-91273A596 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength to withstand high-stress applications
• Precise alignment and smooth rotation thanks to the precisely machined 5/16" diameter shoulder with tight tolerances
• Secure installation and removal with knurled socket head and 5/32" hex drive preventing cam-out during torque application
• Reliable thread engagement with Class 2A fit 5/16"-18 UNC coarse threads ensuring consistent fastening performance
• Enhanced durability with Rockwell B55 hardness providing excellent wear resistance in demanding applications
• Compliance with environmental regulations including RoHS 3 and REACH for global market acceptance

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw with black oxide finish delivers critical performance advantages in precision industrial applications. The 5/16"-18 UNC coarse thread design ensures rapid assembly and disassembly while maintaining secure fastening in machinery, automation equipment, and rotating assemblies. The precisely manufactured shoulder provides accurate component positioning and acts as a bearing surface, reducing wear on mating parts. The socket head with knurled texture and 5/32" hex drive offers superior torque transmission without stripping, while the 70,000 psi tensile strength and 35,000 psi shear strength guarantee structural integrity under heavy loads. Ideal for precision instruments, conveyor systems, and manufacturing equipment where alignment accuracy and corrosion resistance are paramount.

Specification Summary & Compliance

This shoulder screw features Class 2A thread fit with precise shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to UNC thread standards with right-hand thread direction and coarse thread spacing. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for industrial components.