S-91253A981 1"-14 x 2 1/2" 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 black-oxide coating that protects against rust in demanding industrial environments
- Exceptional load-bearing capability with 130,000 psi tensile strength for heavy-duty applications requiring reliable fastening
- Precise thread engagement with Class 3A fit and fine thread spacing ensuring vibration resistance and secure installations
- High-torque installation capability through 5/8" hex drive design that prevents stripping during high-stress assembly
- Optimal flush mounting with standard 82° countersink angle for seamless surface integration in precision applications
- Enhanced material durability with Rockwell C37 hardness providing excellent wear resistance and long service life
- Full-thread engagement design maximizes grip strength and distributes stress evenly across the entire fastener length
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws deliver exceptional performance in demanding industrial settings where corrosion resistance and high tensile strength are critical. The Class 3A thread fit with fine thread spacing provides superior vibration resistance in machinery, automotive assemblies, and structural applications. The 5/8" hex drive accommodates high torque installation without cam-out, while the 82° countersink angle ensures flush mounting in precision equipment. Engineered with fully threaded UNS design, these screws distribute clamping force evenly, preventing stress concentration points in heavy-duty fastening applications requiring reliable, long-term performance under extreme conditions.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNS thread type and fine thread spacing for precision alignment. Complies with ASTM F835 specifications for mechanical properties and performance standards. Meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. The alloy steel construction maintains 130,000 psi tensile strength and Rockwell C37 hardness throughout the 2-1/2" fully threaded length, ensuring consistent performance across industrial applications.
