S-91263A509 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 zinc-plated alloy steel construction, ensuring long-term reliability in harsh industrial environments
- Superior holding power with 130,000 psi tensile strength and Rockwell C39 hardness for demanding applications
- Precise thread engagement with Class 3A fine thread fit, reducing the risk of stripping and ensuring secure fastening
- Efficient flush installation with standard flat head profile and 82° countersink angle for seamless surface finishing
- Easy installation and removal with 5/64" hex drive design, providing reliable torque transfer without cam-out
- Full thread coverage along the 3/8" length for maximum grip and load distribution in thin materials
- Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for safe, quality-driven manufacturing
Professional Applications & Engineering Value
These 6-40 UNF flat head screws deliver critical performance in precision assemblies where space constraints and material integrity are paramount. The zinc-plated alloy steel construction provides excellent corrosion protection for outdoor equipment, electrical enclosures, and automotive components, while the Class 3A fine thread fit ensures vibration resistance in machinery and electronic housings. The 82° countersink angle and flat head design allow for flush mounting in countersunk holes, preventing snagging and maintaining aerodynamic or aesthetic surfaces. With fully threaded design and 130,000 psi tensile strength, they solve common failure points in high-stress applications, offering engineers a reliable fastening solution that combines durability with regulatory compliance for global industrial standards.
Specification Summary & Compliance
These screws feature precision 6-40 UNF fine threads with Class 3A thread fit for tight tolerances and secure fastening. Manufacturing adheres to ASTM F835 specifications, ensuring consistent quality and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence for international industrial use.
