S-8077A749 1/2"-13 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 tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and stress.
- Precise Class 3A thread fit and UNC coarse thread design for secure, vibration-resistant fastening in demanding applications.
- Knurled socket head with hex drive provides excellent grip and torque transmission, reducing slippage during installation.
- Accurate shoulder dimensions with tight tolerances ensure consistent alignment and smooth operation in assemblies.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for global use.
- Durable Rockwell B79 hardness enhances wear resistance and extends service life in repetitive mechanical operations.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The 316 stainless steel material, combined with a black oxide finish, offers exceptional corrosion resistance, making it suitable for industries like automotive, aerospace, and marine where exposure to moisture and chemicals is common. The UNC coarse thread and Class 3A fit ensure quick, secure fastening, reducing assembly time and minimizing the risk of loosening under vibration. With a 3 1/2" shoulder length and precise diameter tolerances, it provides stable pivoting and spacing in linkages, bearings, and rotating assemblies, enhancing overall system reliability and reducing maintenance needs.
Specification Summary & Compliance
This shoulder screw features a 1/2"-13 UNC thread with Class 3A fit for high precision, and dimensions including a shoulder diameter of 5/8" (tolerance: -0.004" to -0.002") and shoulder length of 3 1/2" (tolerance: -0.005" to 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) standards, ensuring environmental safety and regulatory adherence.
