S-8077A664 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 316 stainless steel construction and protective black oxide finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with a 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise alignment and secure fit ensured by the Class 3A thread fit and standard shoulder, minimizing play in assemblies.
• Easy installation and removal with a hex socket drive and knurled head for improved grip and torque application.
• Broad compatibility with 1/4"-20 UNC coarse threads, conforming to ASME B18.3 standards for consistent quality.
• Enhanced durability from Rockwell B79 hardness, providing long service life in demanding applications.
• Compliance with global regulations including RoHS 3 and REACH, ensuring safe and sustainable use.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion. The black oxide finish enhances its resistance to oxidation and wear, making it suitable for machinery, automotive, and marine applications where moisture and chemicals are present. The Class 3A thread fit and precise shoulder dimensions provide stable positioning in assemblies, reducing the need for additional components and simplifying maintenance. With a coarse UNC thread and hex socket drive, it offers quick installation and high torque capacity, improving efficiency in production lines and equipment repair. Ideal for precision shoulder bolt uses in pivots, guides, and rotating parts, this fastener delivers reliable performance and extended service life in rigorous B2B environments.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for tight tolerances, a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002"), and shoulder length of 15/16" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard quality.