S-91273A231 1/2"-13 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
• Superior torque transmission with the knurled hex socket head design, preventing tool slippage during installation
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise component alignment enabled by the 5/8" shoulder length with tight tolerances for accurate assembly
• Reliable fastening performance with Class 2A thread fit and UNC coarse threads for quick, secure engagement
• Broad compatibility with standard 1/4" hex drive tools, streamlining maintenance and installation processes
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global market suitability

Professional Applications & Engineering Value

This 1/2"-13 UNC shoulder screw delivers critical engineering solutions where precise rotational alignment and axial positioning are paramount. The 18-8 stainless steel construction provides excellent corrosion resistance for machinery operating in humid or chemically aggressive environments, while the 5/8" shoulder length with controlled tolerances ensures accurate bearing surfaces and component spacing in assemblies. The knurled hex socket head offers superior anti-slip performance during high-torque applications, preventing damage to drive interfaces. These shoulder screws are engineered to maintain structural integrity under substantial 70,000 psi tensile loads, making them ideal for precision equipment, rotating assemblies, and industrial machinery where vibration resistance and dimensional stability are critical operational requirements.

Specification Summary & Compliance

This shoulder screw features Class 2A thread fit per UNC standards with precise shoulder diameter tolerance (-0.004" to -0.002") and shoulder length tolerance (-0.005" to 0.005"). Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. The mechanical properties include 70,000 psi tensile strength and 35,000 psi minimum shear strength with Rockwell B55 hardness for consistent performance in industrial applications.