S-8077A794 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 industrial environments and extended service life.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
- Precision alignment and smooth rotation enabled by the 4" shoulder with tight diameter and length tolerances, reducing wear on mating parts.
- Secure, non-slip installation with a knurled socket head and 5/32" hex drive, allowing for high torque application without stripping.
- Robust thread engagement from the 1/4"-20 UNC coarse thread with Class 3A fit, ensuring vibration resistance and easy assembly.
- Enhanced durability and minimal galling due to the black oxide finish on the 316 stainless steel, providing added surface protection.
- Guaranteed compliance and reliability meeting ASME B18.3, RoHS 3, and REACH standards for safe, regulated use in various industries.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assemblies, such as in machinery, automotive, and aerospace components. The 4" shoulder length with minimal tolerances ensures exact positioning for rotating parts like gears and pulleys, preventing misalignment and reducing maintenance needs. The black oxide finish on the stainless steel enhances corrosion resistance in humid or chemical-exposed settings, while the Class 3A thread fit and UNC coarse thread provide secure fastening that withstands vibrations. With a Rockwell B79 hardness and high tensile strength, it delivers long-term reliability in demanding industrial applications, minimizing downtime and replacement costs.
Specification Summary & Compliance
This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 specifications for consistent manufacturing quality and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.
