S-91259A133 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
• Precision thread engagement with Class 3A UNC threads ensuring secure fastening and vibration resistance
• Enhanced grip and handling through the knurled head design, allowing for easier installation and removal
• High durability and wear resistance achieved through Rockwell C32 hardness and alloy steel construction
• Versatile drive compatibility with standard 1/2" hex socket drive for efficient torque application
• Regulatory compliance assurance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This alloy steel shoulder screw with 3/4"-10 UNC Class 3A threading delivers critical engineering solutions for precision machinery and heavy-duty equipment. The black oxide finish provides essential corrosion protection in manufacturing environments where exposure to moisture and chemicals is common. The precisely machined shoulder diameter and length with tight tolerances ensure accurate alignment in rotating assemblies, pivot points, and spacing applications. The knurled head texture combined with the hex socket drive allows for secure tool engagement during installation, reducing slippage in high-torque scenarios. With 140,000 psi tensile strength and 84,000 psi shear strength, this component maintains structural integrity under extreme mechanical stresses, making it ideal for automotive, aerospace, and industrial machinery applications where failure is not an option.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit with UNC coarse threading for superior engagement. Shoulder dimensions feature precise tolerances: diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel with Rockwell C32 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.