S-91259A145 3/4"-10 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments
• Precise alignment and rotational control ensured by the 6" shoulder with tight diameter tolerance of -0.004" to -0.002"
• High-strength Class 3A threads offering superior engagement and vibration resistance in coarse UNC threading
• Secure installation and removal facilitated by the knurled socket head with 1/2" hex drive, preventing tool slippage
• Enhanced durability through Rockwell C32 hardness and alloy steel construction, resisting wear under repeated use
• Full regulatory compliance with ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality assurance

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions where precise component alignment and rotational stability are paramount. The 6" shoulder length with standard fit provides exact positioning in machinery, jigs, and rotating assemblies, eliminating misalignment issues that cause premature wear. The black oxide finish enhances corrosion resistance in industrial settings, while the Class 3A UNC coarse threads ensure secure fastening in high-vibration environments. With 140,000 psi tensile strength and 84,000 psi shear strength, it withstands extreme loads in heavy-duty applications such as automotive fixtures, conveyor systems, and precision manufacturing equipment. The knurled socket head with 1/2" hex drive allows for reliable torque application, making it ideal for maintenance-intensive operations where repeated adjustments are necessary.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit with UNC 3/4"-10 coarse threading for superior engagement. The shoulder features precise dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufacturing complies with ASME B18.3 specifications and ASTM A574 material standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.