S-92949A711 5/16"-18 x 3 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 18-8 stainless steel construction and passivated finish, ideal for harsh environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Precise thread engagement with Class 3A fit and UNC coarse threading ensuring reliable fastening in demanding conditions
- Easy installation and removal with 3/16" hex drive and rounded button head design requiring minimal clearance
- Full thread coverage across the entire 3 1/2" length for maximum grip and load distribution
- Regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
- Versatile industrial application with right-hand threading suitable for machinery, equipment, and structural assemblies
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 18-8 stainless steel rounded head screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The passivated finish provides an additional protective layer against chemical exposure and oxidation, significantly extending service life in manufacturing plants, marine applications, and food processing equipment. With Class 3A thread fit and UNC coarse threading, these fasteners maintain precise tolerances even under vibration and dynamic loads. The combination of 70,000 psi tensile strength and fully threaded design ensures uniform stress distribution, preventing joint failure in heavy machinery, structural frameworks, and precision equipment assemblies where consistent clamping force is essential.
Specification Summary & Compliance
This 5/16"-18 UNC screw features precise Class 3A thread fit with standard UNC coarse threading and full threading along the 3 1/2" length. Manufactured to ASME B18.3 specifications with dimensional accuracy including 0.547" head diameter and 0.166" head height. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
