S-8077A143 2-56 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 construction, ideal for harsh environments and extended service life.
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress.
- Precise alignment and smooth rotation enabled by the precision-ground shoulder with standard fit and knurled head for improved grip.
- Enhanced durability and wear resistance from the Black Oxide finish and Rockwell B79 hardness rating.
- Secure and efficient installation with a 5/64" hex socket drive and coarse UNC threading for quick assembly and high resistance to loosening.
- Strict dimensional accuracy with Class 3A thread fit ensuring consistent, reliable fastening in precision applications.
- Compliance with global environmental standards including RoHS 3 and REACH, making it suitable for regulated industries.
Professional Applications & Engineering Value
This 2-56 UNC shoulder screw in 316 stainless steel with a Black Oxide finish is engineered to address critical challenges in industrial assembly. The precision shoulder provides an exact pivot point or bearing surface, reducing wear on components and ensuring accurate alignment in machinery, automation systems, and electronic enclosures. Its coarse thread spacing and Class 3A thread fit offer superior vibration resistance and faster installation, while the hex drive and knurled head allow for secure tool engagement in confined spaces. Ideal for applications demanding high tensile strength and corrosion resistance, this fastener delivers long-term reliability in demanding environments such as marine, chemical processing, and precision instrumentation.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional control. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent performance. Manufactured from 316 stainless steel and finished with Black Oxide, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting use in regulated industrial and electronic applications.
