S-91273A303 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by the 3/4" shoulder with tight diameter and length tolerances
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure, non-slip installation provided by the knurled socket head and 1/8" hex drive
• Reliable coarse threading with UNC 1/4"-20 Class 2A fit for quick assembly and vibration resistance
• Durable mechanical performance backed by Rockwell B55 hardness for long service life
• Global compliance assurance meeting RoHS 3 and REACH environmental regulations

Professional Applications & Engineering Value

This socket head shoulder screw delivers critical engineering solutions where precise alignment and rotational movement are paramount. The 18-8 Stainless Steel material provides excellent corrosion resistance, while the 3/4" shoulder length with controlled tolerances acts as a precise axle or pivot point in machinery, eliminating misalignment in assemblies. The UNC coarse thread ensures rapid installation and maintains integrity under vibration, making it ideal for industrial equipment, mounting systems, and pivoting mechanisms. With its knurled head and hex drive, it offers secure torque transmission, preventing tool slippage during high-tension fastening in automated production environments.

Specification Summary & Compliance

This shoulder screw maintains Class 2A thread fit per UNC standards with shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to industrial specifications, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency for global industrial applications.