S-91263A737 5/16"-18 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy 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
- Exceptional corrosion resistance with zinc-plated alloy steel construction for long-lasting performance in demanding environments
- Superior load-bearing capacity with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
- Optimized flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
- Enhanced installation efficiency through hex drive design and coarse UNC threading for quick assembly
- Reliable partial threading provides controlled clamping force while minimizing thread damage risks
- Full regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws deliver critical engineering solutions where surface flushness and structural integrity are paramount. The zinc-plated alloy steel construction provides essential corrosion protection for machinery, automotive, and construction applications exposed to harsh conditions. With 130,000 psi tensile strength and Rockwell C39 hardness, these fasteners maintain clamping force under extreme vibration and load stresses. The 82° countersink angle ensures proper seating in standardized recesses, while the hex drive facilitates high-torque installation without cam-out. The coarse UNC threading and partial threading design prevent cross-threading during assembly and provide optimal grip length for structural connections.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit tolerances with UNC coarse thread spacing and right-hand threading. The 3" length features minimum 1-1/8" thread length with 0.313" thread diameter. Complies with ASTM F835 specifications for mechanical properties and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.
