S-8077A835 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 extended service life.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
- Precise component alignment enabled by the consistent 5/16" shoulder diameter and 3/16" shoulder length for accurate positioning.
- Enhanced grip and reduced tool slippage from the knurled head and 5/32" hex socket drive for secure installation.
- Reliable thread engagement with Class 3A fit and coarse 1/4"-20 UNC threads, ensuring vibration resistance and easy assembly.
- Durable surface protection via the black oxide finish, which adds wear resistance and a professional appearance.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and industrial equipment. The black oxide finish enhances corrosion resistance, making it suitable for moist or chemically aggressive environments, while the Class 3A thread fit and coarse UNC thread provide secure fastening that resists loosening under vibration. The knurled socket head allows for easy torque application, reducing installation time and tool wear. Ideal for applications requiring exact shoulder positioning, such as in pivoting mechanisms, bearing mounts, and assembly jigs, this screw ensures dimensional stability and long-term reliability, supported by its high tensile and shear strength.
Specification Summary & Compliance
The screw features a 1/4"-20 UNC thread with Class 3A precision tolerance for consistent fit. Shoulder dimensions include a diameter of 5/16" (tolerance: -0.004" to -0.002") and length of 3/16" (tolerance: -0.005" to 0.005"), ensuring accurate alignment. It meets ASME B18.3 specifications for dimensional standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its safety and environmental adherence.
