S-8077A642 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
- High mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable, heavy-duty applications.
- Precise thread engagement with Class 3A UNC coarse threads ensuring secure fastening and reduced cross-threading risks.
- Secure grip and easy installation thanks to the knurled socket head and 3/16" hex drive, minimizing slippage during assembly.
- Accurate alignment and spacing provided by the 2 3/4" shoulder with tight tolerances, enhancing component stability.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
- Durable and long-lasting performance with Rockwell B79 hardness, reducing wear and maintenance needs over time.
Professional Applications & Engineering Value
This shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure in demanding applications. Made from 316 Stainless Steel with a Black Oxide finish, it resists rust and chemical exposure, making it suitable for machinery, automotive, and marine environments. The UNC coarse threads and Class 3A fit ensure quick, reliable assembly, while the knurled socket head and hex drive prevent tool slippage, improving efficiency. The precise shoulder design supports rotational components, reducing vibration and wear in assemblies like pivots and bearings, thereby extending equipment lifespan and minimizing downtime.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for high precision, and dimensional tolerances include shoulder diameter of -0.004" to -0.002" and length of -0.005" to 0.005". It complies with ASME B18.3 manufacturing standards, ensuring consistent quality, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substances.
