S-8077A319 3/8"-16 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
- Exceptional mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for heavy-duty applications
- Precision Class 3A thread fit ensures secure, vibration-resistant fastening with minimal backlash
- Enhanced grip and handling from the knurled socket head with 1/4" hex drive for easy installation
- Accurate shoulder positioning with controlled diameter and length tolerances for reliable component alignment
- Long-term reliability supported by Rockwell B79 hardness and compliance with ASME B18.3 standards
- Environmentally responsible manufacturing meeting RoHS 3 and REACH regulations for global supply chain compatibility
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw in 316 Stainless Steel with Black Oxide finish addresses critical engineering challenges in machinery assembly, automation systems, and precision equipment. The coarse UNC threads and Class 3A fit provide rapid installation and secure retention under dynamic loads, while the precisely machined shoulder maintains exact component spacing—eliminating misalignment in rotating assemblies. The socket head with hex drive allows for high-torque tightening in confined spaces, and the combination of corrosion-resistant material and surface treatment ensures longevity in humid or chemically aggressive environments. Ideal for pivots, axles, and guiding mechanisms, this screw delivers consistent performance where dimensional stability and durability are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. The shoulder features a diameter of 1/2" (tolerance: -0.004" to -0.002") and length of 1 7/8" (tolerance: -0.005" to 0.005") to ensure precise assembly. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material traceability.
