S-8077A344 5/16"-18 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 for extended service life in harsh environments
- Precise alignment and positioning with Class 3A thread fit ensuring secure, vibration-resistant connections in critical assemblies
- Enhanced grip and torque application through knurled socket head design and 1/4" hex drive for reliable installation
- High mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Reduced assembly time with coarse UNC threads providing faster installation compared to fine-thread alternatives
- Industry compliance assurance meeting ASME B18.3 specifications for consistent quality and performance
- Environmental regulation compliance with RoHS 3 and REACH adherence for global manufacturing applications
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw with black oxide finish provides critical corrosion protection in chemical processing, marine, and food equipment applications where moisture and corrosive agents degrade standard fasteners. The Class 3A thread fit ensures precise engagement with mating components, eliminating play in precision machinery, robotic arms, and bearing assemblies. The knurled socket head design prevents tool slippage during high-torque installation, while the 5/16"-18 UNC coarse thread configuration enables rapid assembly in production environments. The integrated shoulder acts as a precision spacer or pivot point, maintaining alignment in rotating mechanisms and reducing wear on connected components.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with 5/16"-18 UNC coarse threads and precise shoulder diameter tolerance of -0.004" to -0.002". Manufacturing complies with ASME B18.3 specifications, ensuring dimensional consistency and mechanical performance. The component meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming restriction of hazardous substances. Material certification includes Rockwell B79 hardness and verified 70,000 psi tensile strength with 35,000 psi minimum shear strength.
