S-8077A668 1/4"-28 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 from 316 stainless steel and black oxide finish, ideal for harsh industrial environments.
- Precise alignment and smooth rotation ensured by the 3/8" diameter shoulder with tight tolerances, reducing assembly errors.
- High-strength fastening with 70,000 psi tensile and 35,000 psi shear strength for demanding mechanical applications.
- Secure, non-slip installation using the hex drive socket and knurled head for enhanced grip during torque application.
- Reliable fine thread engagement with Class 3A UNF 1/4"-28 threads, providing vibration resistance and leak-proof connections.
- Long service life and durability supported by Rockwell B79 hardness and compliance with ASME B18.3 standards.
- Environmentally safe usage as it meets RoHS 3 and REACH regulations, ensuring no hazardous substances.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with a black oxide finish is engineered to address critical challenges in precision assembly and high-stress environments. Its 3-inch shoulder length and precise diameter tolerance provide stable alignment in rotating parts, reducing wear in machinery, automotive, and aerospace applications. The Class 3A UNF fine thread ensures tight, vibration-resistant fits, crucial for equipment subject to dynamic loads. With high tensile and shear strength, it prevents joint failure in heavy-duty industrial fasteners, while the knurled head and hex drive facilitate secure installation in confined spaces. Ideal for use in pumps, conveyors, and precision instruments, this screw delivers consistent performance where corrosion resistance and dimensional accuracy are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision. Dimensions include a 3/8" shoulder diameter (tolerance: -0.004" to -0.002") and 3" shoulder length (tolerance: -0.005" to 0.005"), ensuring exact alignment. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity.
