S-8077A659 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
- Exceptional mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for reliable, high-load applications
- Precision Class 3A thread fit ensures consistent, secure fastening with minimal backlash in assemblies
- Knurled head design provides enhanced grip for manual adjustments and reduces slippage during installation
- Hex socket drive allows for high-torque installation and removal in confined spaces
- Strict dimensional control on shoulder diameter and length for precise alignment in machinery and pivoting applications
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH for safe, global industrial use
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and wear challenges in industrial machinery, automation systems, and precision equipment. The 316 Stainless Steel material, combined with a Black Oxide finish, provides excellent resistance to corrosion, chemicals, and oxidation, extending service life in demanding environments. The 1/4"-20 UNC coarse thread and Class 3A fit ensure rapid assembly and vibration resistance, while the precisely machined shoulder acts as a bearing surface or pivot point, reducing part wear and maintaining alignment. Its Rockwell B79 hardness and high tensile strength make it suitable for applications requiring durability under dynamic loads, such as in conveyor systems, robotic arms, and assembly jigs.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement. Key dimensions include a 1/4"-20 UNC thread with 3/4" length, 3/8" shoulder diameter (tolerance: -0.004" to -0.002"), and 9/16" shoulder length (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.
