S-8077A833 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
- Precise alignment and secure positioning thanks to the knurled head and standard shoulder fit for reduced assembly movement
- High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Consistent thread engagement with Class 3A fit and UNC coarse threads for reliable fastening and vibration resistance
- Easy installation and removal using a standard 5/32" hex drive for efficient maintenance and assembly
- Durable performance backed by Rockwell B79 hardness and compliance with ASME B18.3, RoHS 3, and REACH standards
- Versatile right-hand threading ensures compatibility with common industrial equipment and fastening systems
Professional Applications & Engineering Value
This 1/4"-20 UNC thread shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The 316 Stainless Steel material, combined with a Black Oxide finish, provides exceptional resistance to corrosion, chemicals, and high-moisture environments, extending service life in applications like conveyor systems, motor mounts, and robotic arms. The knurled head enhances grip during manual adjustments, while the Class 3A thread fit ensures minimal backlash and secure fastening under dynamic loads. Its 70,000 psi tensile strength and 35,000 psi shear strength make it suitable for high-stress points, reducing the risk of fastener failure and maintenance downtime in industrial settings.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy and reliable performance. It adheres to ASME B18.3 manufacturing specifications, ensuring consistent quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industries without hazardous substances.
