S-90300A140 5/16"-18 x 1/2" 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
- Enhanced corrosion resistance with 18-8 Stainless Steel construction for long-term reliability in harsh environments
- Superior load distribution through the integrated stainless steel flat washer (0.89" OD) preventing surface damage and loosening
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B95 hardness for heavy-duty applications
- Quick installation and secure fit with Class 2A coarse UNC threads and external hex drive for easy torque application
- Full thread engagement along the 1/2" length ensures maximum holding power and vibration resistance
- Regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industrial sectors
- Versatile compatibility with standard 1/2" wrench sizes and UNC threading for broad application across equipment and machinery
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 5/16"-18 UNC hex head screws combine 18-8 stainless steel durability with an integrated flat washer to address common fastening challenges. The coarse thread design prevents cross-threading during high-speed assembly while maintaining secure connections in vibrating machinery. With 100,000 psi tensile strength and complete threading, they distribute stress evenly across joined materials, reducing point failures in structural applications. The external hex drive allows for high-torque installation in confined spaces, making them ideal for manufacturing equipment, transportation systems, and heavy machinery where vibration resistance and corrosion protection are critical.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit per UNC standards with 5/16"-18 threading and 1/2" length. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. The assembly includes a stainless steel flat washer (0.89" OD × 0.064" thickness) permanently integrated for consistent performance. Mechanical properties meet 100,000 psi tensile strength and Rockwell B95 hardness specifications for industrial-grade fastening requirements.
