S-8077A628 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and chemical exposure.
• Enhanced durability and wear resistance from the Black Oxide finish, providing a protective layer against abrasion.
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications.
• Precise thread engagement with Class 3A fit, reducing the risk of cross-threading and ensuring secure fastening.
• Easy installation and removal using a standard hex drive (3/16"), combined with a knurled head for improved grip during manual handling.
• Accurate alignment and spacing due to the consistent shoulder diameter and length, minimizing assembly errors.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in industrial applications where precision, strength, and environmental resistance are paramount. The 316 Stainless Steel material offers excellent resistance to corrosion and high temperatures, making it suitable for machinery, automotive, and marine equipment. The Black Oxide finish not only enhances aesthetics but also provides an added layer of protection against wear and oxidation. With a Class 3A thread fit and UNC coarse thread, it ensures quick assembly and reliable performance in high-vibration settings. The knurled head and hex drive design facilitate easy handling and torque application, reducing installation time and improving operational efficiency in automated systems or precision tooling.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for precise tolerance, a shoulder diameter of 3/8" with tight tolerance (-0.004" to -0.002"), and a shoulder length of 15/32" (±0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.