S-91273A599 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced durability and wear resistance from the black oxide finish, extending service life
• Reliable high-strength performance with 70,000 psi tensile and 35,000 psi shear strength for demanding applications
• Precision alignment and smooth rotation ensured by the 1-1/4" shoulder with tight diameter tolerance
• Secure, non-slip installation thanks to the knurled socket head and 5/32" hex drive
• Easy assembly and disassembly with coarse 5/16"-18 UNC threads and Class 2A fit
• Compliance with environmental regulations including RoHS 3 and REACH for global market acceptance

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and rotational challenges in industrial applications. The 18-8 stainless steel material provides excellent corrosion resistance, while the black oxide finish enhances surface durability and reduces galling. The precision 1-1/4" shoulder length with minimal tolerance ensures accurate component positioning in assemblies like pivots, gears, and linkages. The coarse UNC threads and Class 2A fit facilitate quick installation in high-vibration environments, and the knurled socket head allows for secure tool engagement. Ideal for machinery, automotive, and electronics where reliable fastening and repeatable performance are essential.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 2A fit for standard tolerance, a shoulder diameter of 5/16" with tolerance of -0.004" to -0.002", and shoulder length of 1-1/4" with tolerance of -0.005" to 0.005". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring it is free of restricted hazardous substances and suitable for use in regulated industries.