S-91253A161 6-40 x 3/8" 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 black-oxide coating, ideal for industrial environments requiring durable surface protection
- Superior thread engagement and vibration resistance from Class 3A UNF fine threads, ensuring reliable fastening in precision assemblies
- High tensile strength of 130,000 psi provides secure, long-lasting connections under demanding mechanical loads
- Optimized flush mounting with 82° countersink angle and flat head design for seamless integration into machined surfaces
- Enhanced drive stability through hex drive (5/64") configuration, allowing high-torque installation without cam-out
- Consistent performance across temperature variations due to Rockwell C39 hardness and alloy steel construction
- Full regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
Engineered for precision assemblies requiring flush surface profiles, these 6-40 UNF flat head screws deliver critical solutions in aerospace components, electronic enclosures, and machinery where vibration resistance and dimensional accuracy are paramount. The black-oxide alloy steel construction combats corrosion while maintaining 130,000 psi tensile strength under cyclic loading conditions. Class 3A thread fit ensures zero-backlash fastening in tapped holes, while the 82° countersink angle provides optimal load distribution in thin-section materials. These fully threaded fasteners eliminate the need for multiple screw types in inventory, streamlining maintenance and production workflows across industrial fastener applications.
Specification Summary & Compliance
Manufactured to inch system dimensions with Class 3A thread tolerances per UNF standards. Complies with ASTM F835 mechanical properties and surface treatment requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions. Right-hand fine threading ensures consistent engagement in precision-tapped holes.
