S-91255A131 5-44 x 3/8" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive 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 durability and corrosion resistance from black-oxide alloy steel, ideal for harsh industrial environments
- Superior thread engagement and vibration resistance with Class 3A UNF fine threads for reliable, long-term fastening
- High tensile strength of 120,000 psi ensures secure performance under heavy loads and stress
- Easy installation and removal with 5/64" hex drive, reducing assembly time and tool wear
- Consistent quality and reliability backed by compliance with ASME B18.3 and ASTM F835 standards
- Low-profile rounded head design provides a smooth finish and reduces snagging in tight spaces
- Environmental and safety assurance through RoHS 3 and REACH compliance, meeting global regulatory requirements
Professional Applications & Engineering Value
These 5-44 UNF Class 3A rounded head screws are engineered to address critical challenges in precision assembly and high-stress applications. Made from black-oxide alloy steel, they offer enhanced corrosion resistance and durability, reducing maintenance needs in machinery, automotive, and electronics. The fully threaded design and fine thread spacing ensure maximum grip and vibration resistance, preventing loosening in dynamic environments. With a Rockwell C39 hardness and 120,000 psi tensile strength, they withstand extreme forces without failure. The 5/64" hex drive allows for efficient torque application, speeding up installation in confined spaces while maintaining a clean, low-profile appearance with the button head style. Ideal for OEM and MRO uses where precision, strength, and regulatory compliance are non-negotiable.
Specification Summary & Compliance
This screw features precise Class 3A thread fit with UNF fine threads for tight tolerances and reliable performance. Dimensions include a 3/8" length, 0.125" thread diameter, and 0.238" head diameter. It meets ASME B18.3 and ASTM F835 specifications for consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety standards.
