S-97345A621 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, ideal for harsh industrial environments and chemical exposure
- Precise component alignment ensured by the 3/8" shoulder diameter with tight tolerance control for reduced assembly vibration
- High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear capacity for demanding load-bearing applications
- Secure, non-slip installation with knurled head texture and 3/16" hex drive for reliable torque transfer
- Consistent thread engagement through Class 3A fit UNC coarse threads, minimizing cross-threading risks
- Extended service life supported by Rockwell B79 hardness for wear resistance in high-cycle operations
- Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw delivers critical engineering solutions where precision alignment and corrosion resistance are paramount. The 5/16"-18 UNC coarse thread with Class 3A fit ensures rapid assembly in machinery, automation systems, and pivoting mechanisms while maintaining vibration resistance. The knurled socket head combined with hex drive provides positive grip during high-torque installation, preventing tool slippage in confined spaces. With its 5/8" shoulder length acting as a precision spacer, this component eliminates bushing requirements in rotating assemblies, reducing part count and maintenance cycles in industrial equipment, marine hardware, and food processing machinery where corrosion-resistant fasteners are essential.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. Shoulder diameter tolerance maintained at -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for global supply chains.
