S-90300A130 1/4"-20 x 1" Hex Head Screws with Flat Washer
Hex Head Screws with Flat Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B95 hardness for heavy-duty applications
- Enhanced load distribution through the integrated flat washer, reducing surface damage and improving joint integrity
- Reliable coarse threading (UNC) with Class 2A fit for quick assembly and vibration resistance in demanding conditions
- Optimized external hex drive for high-torque installation using standard tools, minimizing slippage
- Full threading along the 1" length ensures maximum grip and uniform stress distribution across the entire fastener
- Compliance with environmental regulations including RoHS 3 and REACH, supporting sustainable procurement practices
Professional Applications & Engineering Value
This 18-8 stainless steel hex head screw is engineered to address common industrial challenges such as corrosion-induced failure and joint loosening under dynamic loads. The combination of 100,000 psi tensile strength and a fully threaded UNC coarse design provides reliable performance in machinery assembly, structural frameworks, and outdoor equipment. The integrated flat washer increases bearing surface area, preventing surface indentation and distributing clamp load effectively—critical in soft or composite materials. With its external hex drive and Class 2A thread fit, it ensures rapid installation and consistent torque transfer, reducing assembly time and maintenance needs in automotive, construction, and marine sectors.
Specification Summary & Compliance
This screw adheres to UNC thread standards with Class 2A tolerance for consistent fit and function. Dimensions include a 1/4"-20 thread size, 1" length, and a flat washer with 0.749" OD and 0.064" thickness. It is manufactured from 18-8 stainless steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability.
