S-8077A838 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, ideal for harsh environments and chemical exposure.
- Enhanced durability and wear resistance from the black oxide finish, providing added protection against rust and abrasion.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Precise Class 3A thread fit for secure, vibration-resistant assemblies with minimal risk of loosening.
- Knurled head design offers improved grip during manual installation and removal, reducing slippage.
- Coarse UNC threading allows for faster installation and easier alignment in various materials.
- Consistent dimensional accuracy with controlled shoulder tolerances for stable positioning in machinery and fixtures.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as corrosion in humid or chemical-laden environments. The black oxide finish enhances surface hardness and reduces friction, extending service life in high-wear applications like rotating assemblies and precision machinery. With a 1/4"-20 UNC coarse thread and Class 3A fit, it ensures quick, secure fastening in metals and composites, minimizing assembly time while maintaining alignment accuracy. The knurled socket head facilitates easy tool engagement, making it ideal for automated systems and maintenance-heavy operations where reliability and efficiency are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with precise dimensions including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". The UNC coarse thread meets Class 3A standards for tight fit and durability. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.
