S-90275A585 5/16"-18 x 1 1/4" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 zinc-plated steel construction for extended service life in demanding environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable heavy-duty applications
- Precise flush mounting achieved through standard 82° countersink angle and flat head design for seamless surface integration
- Quick installation and removal with slotted drive style compatible with standard screwdrivers and tools
- Optimized thread engagement through Class 2A fit UNC coarse threads ensuring secure fastening in various materials
- Full-length threading provides maximum grip along the entire 1-1/4" length for superior load distribution
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
This 5/16"-18 UNC flat head slotted screw delivers critical engineering solutions where flush surface mounting and high-strength fastening are paramount. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, machinery assemblies, and outdoor applications where environmental exposure is a concern. The 82° countersink angle ensures proper seating in standardized recesses, preventing protrusion issues that could interfere with moving parts or create safety hazards. With fully threaded coarse UNC threads and Class 2A fit, these screws offer superior pull-out resistance in wood, metal, and composite materials, making them ideal for structural assemblies, manufacturing fixtures, and maintenance applications requiring dependable, vibration-resistant connections.
Specification Summary & Compliance
This flat head screw features precise inch system measurements with 5/16"-18 UNC coarse threads maintaining Class 2A thread fit tolerances for consistent performance. Manufacturing adheres to ASME B18.6.3 specifications ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance adherence for industrial and commercial applications worldwide.
