S-90585A641 3/8"-16 x 4" 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 316 stainless steel and passivated finish, ideal for harsh chemical and marine environments.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Precise Class 3A thread fit provides secure, vibration-resistant connections in critical assemblies.
- Fully threaded 4" length offers maximum grip and adjustability across the entire fastener.
- Hex drive (7/32") design allows for easy installation and high torque application with standard tools.
- ASME B18.3 compliance guarantees consistent quality, dimensions, and interchangeability.
- RoHS 3 and REACH compliant for safe use in regulated industries and environmentally conscious applications.
Professional Applications & Engineering Value
This 316 stainless steel flat head screw is engineered to solve critical challenges in demanding sectors like chemical processing, marine equipment, and offshore installations. Its passivated finish enhances the natural corrosion resistance of 316 stainless steel, preventing pitting and crevice corrosion in chloride-rich environments. The coarse UNC threading and Class 3A fit ensure rapid assembly and superior vibration resistance, reducing maintenance needs in machinery and structural frameworks. The flat head with standard 82° countersink sits flush for smooth surfaces, while the hex drive provides reliable torque transfer. Fully threaded along its 4" length, it delivers uniform clamping force, making it indispensable for heavy-duty industrial fastening where chemical exposure and mechanical reliability are paramount.
Specification Summary & Compliance
This fastener meets ASME B18.3 specifications for dimensional accuracy, including head diameter (0.781"), head height (0.234"), and UNC 3/8"-16 coarse thread with Class 3A tolerance for precise fit. It is manufactured from 316 stainless steel with a Rockwell B55 hardness and 70,000 psi tensile strength. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures it is free of hazardous substances, suitable for global industrial and environmental standards.
