S-8077A369 8-32 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.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing in demanding applications.
• Precise thread engagement with Class 3A fit and 8-32 UNC coarse threads, ensuring secure fastening and reduced cross-threading risks.
• Easy installation and removal using a standard 1/8" hex socket drive and knurled head for enhanced grip and torque application.
• Accurate shoulder dimensions with tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002") for consistent alignment in assemblies.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
• Durable material hardness at Rockwell B79, providing long-lasting wear resistance and minimal deformation under stress.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automotive, and aerospace industries. The black oxide finish enhances corrosion resistance, making it suitable for humid or chemically aggressive settings. With an 8-32 UNC coarse thread and Class 3A thread fit, it ensures rapid assembly and reliable clamping force, reducing the risk of loosening in high-vibration environments. The knurled head and hex socket drive allow for efficient torque transmission, while the precisely machined shoulder provides stable pivoting or spacing in linkages, bearings, and rotating assemblies. By combining high tensile strength and compliance with ASME B18.3, this screw delivers consistent performance in applications demanding durability and dimensional accuracy.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC thread standards, with precise dimensions including a 3/8" thread length and shoulder diameter of 1/4". Manufacturing conforms to ASME B18.3 specifications, and it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety guidelines for industrial use.