S-90585A656 1/4"-20 x 5" ASME B18.3, ASTM F879 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 construction 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 fastening with minimal risk of loosening.
- 82° countersink angle and flat head design enables flush mounting for a smooth, professional finish in assembled products.
- Hex drive (5/32") allows for easy installation and high torque application without cam-out.
- Fully threaded 5" length offers maximum grip and adjustability across the entire fastener.
- Rockwell B55 hardness enhances durability and resistance to wear in demanding industrial applications.
Professional Applications & Engineering Value
This 316 stainless steel flat head screw is engineered to address critical challenges in corrosive and high-stress environments. Its UNC coarse threading and Class 3A fit ensure quick assembly and reliable hold in materials like metal, plastic, and wood, reducing installation time and maintenance needs. The passivated finish significantly boosts resistance to chemicals, saltwater, and oxidation, making it a top choice for marine equipment, chemical processing plants, and outdoor infrastructure. The combination of 70,000 psi tensile strength and fully threaded design provides uniform load distribution, preventing joint failure in heavy-duty applications such as machinery frames, structural supports, and transportation components.
Specification Summary & Compliance
This screw adheres to inch system dimensions with a 1/4"-20 UNC thread and Class 3A thread fit for precision tolerance. It meets ASME B18.3 and ASTM F879 specifications, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental responsibility in industrial use.
