S-91259A794 1/2"-13 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 140,000 psi tensile strength and 84,000 psi shear strength, ideal for high-stress industrial applications.
• Superior corrosion resistance due to the black oxide finish, extending service life in harsh environments.
• Precise thread engagement with Class 3A thread fit and UNC coarse threads, ensuring reliable fastening and vibration resistance.
• Secure and non-slip installation thanks to the knurled head and 5/16" hex drive, allowing for high torque application without slippage.
• Accurate alignment and spacing provided by the 1" shoulder length with tight tolerances, reducing assembly errors in machinery.
• Broad compliance and reliability meeting ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.
• Optimized for heavy-duty use with Rockwell C32 hardness and alloy steel construction, delivering long-term performance in demanding conditions.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common industrial challenges, such as misalignment and component wear in machinery assemblies. The alloy steel material, combined with a black oxide finish, provides excellent resistance to corrosion and abrasion, making it suitable for automotive, aerospace, and heavy equipment applications. The UNC coarse threads and Class 3A thread fit ensure quick, secure fastening with minimal risk of stripping, while the knurled head and hex drive design facilitate easy installation in tight spaces. By offering precise shoulder length and diameter tolerances, it enables accurate pivoting and spacing in rotating parts, reducing downtime and maintenance costs in industrial shoulder screws applications.

Specification Summary & Compliance

This shoulder screw adheres to tight dimensional tolerances, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 specifications and is manufactured from alloy steel per ASTM A574. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for global industrial use.