S-8077A826 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel and black oxide finish, ideal for harsh industrial environments and extending service life.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit provides smooth assembly, secure fastening, and reduced risk of cross-threading in critical applications.
• Knurled socket head with 5/32" hex drive offers excellent grip and torque transmission, minimizing tool slippage during installation.
• Long 1 5/8" shoulder length with tight tolerances allows for accurate alignment and spacing of components in assemblies.
• Compliance with ASME B18.3 and RoHS/REACH standards guarantees quality, safety, and environmental responsibility for global supply chains.
• Durable Rockwell B79 hardness maintains structural integrity and wear resistance in high-vibration or repetitive-use scenarios.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges, such as misalignment, corrosion, and mechanical failure. The black oxide finish enhances corrosion resistance, making it suitable for outdoor, marine, or chemical-exposed settings. With a 1/4"-20 UNC coarse thread and Class 3A fit, it ensures quick, secure fastening in machinery, automotive, and aerospace assemblies. The knurled socket head and hex drive provide superior torque control, reducing installation errors. Its high-strength shoulder acts as a precision spacer or pivot, improving alignment in rotating parts, linkages, and jigs, thereby minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit, ensuring precise thread engagement and dimensional accuracy. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for consistent performance. It meets ASME B18.3 specifications for dimensional standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, adhering to strict environmental and safety regulations.