S-91253A874 5/8"-18 x 2 1/4" 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
- Exceptional corrosion resistance with black-oxide coating for extended service life in harsh industrial environments.
- Superior holding power from 130,000 psi tensile strength and Rockwell C37 hardness for demanding applications.
- Precise, reliable fastening ensured by Class 3A thread fit and UNF fine threading, minimizing the risk of loosening.
- Efficient installation and removal with a 3/8" hex drive, providing a secure grip for high-torque applications.
- Flush, low-profile seating thanks to the standard flat head and 82° countersink angle for a smooth surface finish.
- Full-length threading offers maximum grip and adjustability along the entire 2-1/4" length.
- Guaranteed regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for safe, reliable use.
Professional Applications & Engineering Value
Engineered for high-stress industrial applications, these Black-Oxide Alloy Steel Flat Head Screws provide a robust fastening solution where failure is not an option. The UNF fine threading and Class 3A fit deliver exceptional vibration resistance, crucial for machinery, heavy equipment, and structural assemblies subjected to dynamic loads. The black-oxide surface treatment significantly enhances corrosion resistance, prolonging component life in environments exposed to moisture and chemicals. With a 130,000 psi tensile strength and 3/8" hex drive for high torque application, these screws ensure reliable performance in automotive, aerospace, and manufacturing sectors, reducing maintenance downtime and improving operational safety.
Specification Summary & Compliance
This screw features a 5/8"-18 UNF fine thread with a precision Class 3A thread fit and is fully threaded along its 2-1/4" length. It is manufactured in compliance with ASTM F835 specifications and is certified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international safety and environmental standards for industrial fasteners.
