S-91263A791 7/16"-20 x 3/4" 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
- Superior corrosion resistance with zinc plating for extended service life in demanding industrial environments
- Exceptional mechanical strength with 130,000 PSI tensile rating and Rockwell C39 hardness for high-load applications
- Precision Class 3A thread fit ensures secure, vibration-resistant fastening in critical assemblies
- Optimized flush mounting with standard 82° countersink angle for smooth surface finishes
- Reliable hex drive engagement with 1/4" drive size for secure tooling and reduced cam-out risk
- Full threading coverage across the 3/4" length for maximum grip and load distribution
- Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These zinc-plated alloy steel flat head screws deliver critical performance advantages for industrial applications where vibration resistance and corrosion protection are paramount. The UNF fine threading (7/16"-20) combined with Class 3A precision fit prevents loosening under dynamic loads, making them ideal for machinery, automotive components, and heavy equipment assemblies. The 82° countersink angle provides seamless flush mounting while the fully threaded design ensures maximum engagement in both thick and thin materials. With 130,000 PSI tensile strength and Rockwell C39 hardness, these hex drive flat head screws maintain structural integrity in high-stress applications where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to ASTM F835 specifications with Class 3A thread fit for superior dimensional accuracy. Features UNF fine threading (7/16"-20) with right-hand direction and standard flat head profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The zinc-plated alloy steel construction ensures consistent performance while meeting international industrial standards for quality and safety.
