S-8077A268 1 1/8"-7 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.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing in demanding applications.
• Precise thread engagement with Class 3A thread fit ensuring tight tolerances and reduced risk of loosening under vibration.
• Easy installation and removal thanks to the 7/8" hex drive and knurled head for improved grip and torque application.
• Durable shoulder design with consistent 1 1/2" shoulder diameter providing stable bearing surfaces for rotating components.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
• Enhanced durability with Rockwell B79 hardness, resisting wear and extending service life in mechanical assemblies.

Professional Applications & Engineering Value

This 1 1/8"-7 UNC shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty equipment. The 316 stainless steel material, combined with a black oxide finish, provides exceptional resistance to corrosion and chemical exposure, making it suitable for applications in marine, chemical processing, and outdoor environments. The coarse UNC thread and Class 3A fit ensure quick assembly and reliable fastening, reducing installation time and minimizing the risk of cross-threading. The knurled socket head and hex drive allow for efficient torque transmission, which is essential in high-vibration settings like automotive or aerospace assemblies. With a robust shoulder diameter and precise tolerances, this screw maintains alignment in rotating parts, preventing misalignment and reducing mechanical failure. Ideal for use in pivots, gears, and linkages, it delivers long-term reliability and performance in industrial shoulder screw applications.

Specification Summary & Compliance

This shoulder screw features a 1 1/8"-7 UNC thread with Class 3A thread fit for high precision, and a shoulder diameter tolerance of -0.004" to -0.002" to ensure consistent performance. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial uses.