S-93791A420 5/16"-18 x 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head 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 black-oxide passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure installation and vibration resistance
- Optimized flush mounting featuring a standard 82° countersink angle and flat head design for seamless surface integration
- Efficient installation and removal with hex drive (3/16") providing superior torque transfer and reduced tool slippage
- Full-threaded design maximizing grip length and load distribution across the entire 1/2" length
- Regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial acceptance
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws are engineered to address critical challenges in industrial assembly, where corrosion resistance and high tensile strength are paramount. The 18-8 stainless steel material, combined with a black-oxide passivated finish, provides excellent protection against oxidation and chemical exposure, making them ideal for machinery, automotive, and outdoor equipment. The Class 3A thread fit and coarse UNC threading ensure rapid assembly and reliable performance in high-vibration applications, while the 82° countersink angle allows for flush mounting in precision components. With a hex drive for efficient torque application, these screws reduce installation time and prevent stripping, delivering consistent performance in demanding industrial fastening scenarios.
Specification Summary & Compliance
This product features precise Class 3A thread fit with UNC coarse threads (5/16"-18) and a fully threaded 1/2" length. Manufacturing adheres to ASME B18.3 specifications, ensuring dimensional accuracy and reliability. The screws are compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental and safety standards for global use.
