S-91255A834 5-40 x 1 1/4" 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 corrosion resistance with Black-Oxide coating on Alloy Steel, extending service life in harsh industrial environments.
- Superior tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing failure risks.
- Precise Class 3A thread fit guarantees secure fastening with minimal play, enhancing assembly accuracy and vibration resistance.
- 5/64" Hex Drive design allows for easy installation and removal with standard tools, saving time in maintenance and production.
- Fully threaded 5-40 UNC coarse spacing provides maximum grip and load distribution across the entire length for sturdy connections.
- Rounded button head profile offers a low-profile, snag-free finish that improves safety and aesthetics in visible applications.
- Compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for quality, safety, and environmental regulations.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this 5-40 UNC rounded head screw addresses common challenges like vibration loosening and corrosion in machinery assembly. The Black-Oxide Alloy Steel construction, combined with a Rockwell C39 hardness, delivers durability against wear and environmental exposure, making it ideal for automotive, aerospace, and heavy equipment applications. Its fully threaded coarse spacing and Class 3A fit ensure rapid installation and reliable retention in materials prone to stress, while the hex drive simplifies tool access in confined spaces. By meeting ASME B18.3 and other key standards, it reduces downtime and maintenance costs, providing a trusted solution for precision fastening needs.
Specification Summary & Compliance
This screw features precise Class 3A thread fit per UNC standards, with dimensions including a 1 1/4" length and 0.125" thread diameter. It complies with ASME B18.3 and ASTM F835 manufacturing specifications, ensuring consistent quality and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental safety and regulatory adherence in global supply chains.
