S-8077A291 3/8"-16 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 and black oxide finish, ideal for harsh industrial environments
- Precise alignment and smooth rotation thanks to the Class 3A thread fit and standard shoulder for reduced wear
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure and easy installation using the hex drive and knurled head for improved grip and torque application
- Dimensional accuracy and consistency ensured by ASME B18.3 compliance and tight shoulder tolerances
- Enhanced durability with Rockwell B79 hardness, providing long-term reliability in mechanical assemblies
- Environmental and safety compliance meeting RoHS 3 and REACH standards for global use
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and strength challenges in precision assemblies. The 316 stainless steel construction, combined with a black oxide finish, offers exceptional resistance to corrosion and oxidation, making it suitable for applications in marine, chemical processing, and outdoor equipment. The UNC coarse thread and Class 3A fit ensure secure fastening with minimal risk of loosening under vibration, while the 1-1/2" shoulder length provides a stable bearing surface for rotating components like gears and pulleys. Its hex drive socket head and knurled texture facilitate easy installation in tight spaces, reducing assembly time and improving operational efficiency in machinery, automotive, and aerospace sectors.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, ensuring dimensional precision with a Class 3A thread fit and tight shoulder tolerances (diameter: -0.004" to -0.002"; length: -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety, with thread details including 3/8"-16 UNC coarse spacing and a thread length of 5/8".
