S-8077A681 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 with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
- Precise component alignment ensured by the 3/8" shoulder diameter with tight tolerances, reducing assembly errors.
- High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing applications.
- Secure, non-slip handling thanks to the knurled head texture and hex drive, allowing for easy installation with standard tools.
- Accurate and durable threading with Class 3A UNF fine threads, providing excellent vibration resistance and joint integrity.
- Consistent quality and safety through compliance with ASME B18.3, RoHS 3, and REACH standards.
- Enhanced durability from Rockwell B79 hardness, ensuring long service life under mechanical stress.
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The Black Oxide finish enhances corrosion resistance, making it suitable for moist or chemically aggressive environments, while the Class 3A UNF fine thread ensures secure fastening in high-vibration applications like robotics and aerospace assemblies. The knurled head and hex drive facilitate quick, tool-friendly installation, reducing downtime. With a robust shoulder diameter and tight tolerances, it provides exact positioning for rotating parts, minimizing wear and improving operational efficiency in industrial settings.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision, a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002", and shoulder length of 5/16" with tolerance of -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) environmental standards, ensuring safety and reliability in global industrial applications.
