S-91259A136 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 high-stress applications.
• Precise component alignment ensured by the 1" diameter shoulder with tight tolerances (±0.005") for accurate positioning in assemblies.
• Superior corrosion resistance from the black oxide finish, extending service life in demanding industrial environments.
• High-strength alloy steel construction with Rockwell C32 hardness for excellent durability and wear resistance.
• Secure and efficient installation using the 1/2" hex drive and knurled head for improved grip and torque application.
• Reliable thread engagement with Class 3A UNC coarse threads, providing strong, vibration-resistant fastening.
• Compliance with major industry standards including ASME B18.3 and ASTM A574, ensuring consistent quality and safety.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and strength requirements in industrial applications such as machinery, automotive assemblies, and precision equipment. The 1" diameter shoulder provides a stable bearing surface that prevents component misalignment, reducing wear and maintenance costs. With its black oxide finish, it offers enhanced corrosion resistance, making it suitable for environments exposed to moisture or chemicals. The 3/4"-10 UNC Class 3A threads ensure secure fastening even under dynamic loads, while the coarse thread design allows for quick assembly and disassembly. Ideal for use in jigs, fixtures, and rotating mechanisms, this screw delivers long-term reliability and performance in high-tensile strength scenarios.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring consistent fit and function. It adheres to ASME B18.3 and ASTM A574 specifications for material and manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial and commercial settings without hazardous substances.