S-91253A156 5-44 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 black-oxide coating, extending service life in demanding industrial environments.
- Exceptional tensile strength of 130,000 PSI ensures reliable performance under high-stress conditions without failure.
- Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance in fine-thread applications.
- Fully threaded design offers maximum grip and load distribution along the entire screw length.
- 82° countersink angle with standard flat head profile allows for flush mounting, reducing snagging and improving aesthetics.
- Hex drive (5/64") compatibility enables high-torque installation with common tools, minimizing stripping risks.
- Compliance with ASTM F835, RoHS 3, and REACH guarantees material safety and adherence to international quality standards.
Professional Applications & Engineering Value
This 5-44 UNF flat head screw is engineered from black-oxide alloy steel to address critical challenges in precision assembly, such as corrosion-induced degradation and thread loosening under vibration. The Class 3A fine thread fit and fully threaded construction ensure consistent clamping force in applications like aerospace components, automotive systems, and electronic enclosures, where fine thread spacing and high tensile integrity are paramount. The 82° countersink angle facilitates seamless integration into tapered holes, reducing protrusion risks while maintaining structural alignment. Ideal for industrial screws requiring reliable performance, it combines material durability with exacting thread standards to minimize maintenance and enhance operational safety.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy with a fine thread spacing. Manufactured in compliance with ASTM F835 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental and health safety. The right-hand thread direction and fully threaded profile support consistent installation torque and load distribution.
