S-92949A560 1/4"-28 x 3/8" 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 thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional thread engagement and reliability with Class 3A fine UNF threads, ensuring precise, vibration-resistant assemblies
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure and efficient installation via 5/32" hex drive, minimizing cam-out and tool slippage during tightening
- Full threading for maximum grip along the entire 3/8" length, providing uniform clamping force
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence
- Rounded button head design reduces surface protrusion and improves aesthetic integration in assembled products
Professional Applications & Engineering Value
Engineered for precision and durability, these 18-8 stainless steel rounded head screws address common industrial challenges such as corrosion, vibration loosening, and assembly integrity. The passivated finish significantly enhances resistance to oxidation and chemical exposure, making them suitable for outdoor equipment, marine hardware, and food processing machinery. With a Class 3A UNF fine thread and hex drive, these screws deliver reliable, high-clamp-force fastening in tight spaces, preventing thread stripping and ensuring long-term performance. Their fully threaded design and high tensile strength support critical applications in aerospace, automotive, and electronics assembly, where failure is not an option.
Specification Summary & Compliance
This screw features a 1/4"-28 UNF fine thread with Class 3A fit for precise tolerance, a length of 3/8", and is fully threaded. It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence in industrial use.
