S-8077A397 10-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and black oxide finish, ideal for harsh industrial environments
• Precise alignment and smooth rotation thanks to Class 3A thread fit and standard shoulder fit for reduced assembly play
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding applications
• Secure, non-slip installation featuring a knurled socket head with hex drive for reliable torque transfer
• Fine UNF thread design provides excellent vibration resistance and holding power in precision assemblies
• Consistent dimensional accuracy with tight shoulder diameter and length tolerances for repeatable performance
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH for global quality assurance

Professional Applications & Engineering Value

This 10-32 UNF thread shoulder screw in 316 stainless steel addresses critical challenges in precision machinery and industrial equipment. The black oxide finish enhances corrosion resistance, extending service life in humid or chemically aggressive settings. Its Class 3A thread fit and fine thread spacing minimize backlash, ensuring stable connections in high-vibration environments like robotics, automotive assemblies, and conveyor systems. The knurled socket head with hex drive allows for secure tool engagement, reducing the risk of stripping during high-torque installation. With a Rockwell B79 hardness and robust shoulder design, it provides reliable pivoting and spacing functions while maintaining alignment under dynamic loads, making it an essential precision shoulder screw for OEM and MRO applications.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement. Critical dimensions include a shoulder diameter of 1/4" (tolerance: -0.004" to -0.002") and shoulder length of 5/8" (tolerance: -0.005" to 0.005"), ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material traceability for global supply chains.