S-91255A542 1/4"-20 x 1" 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 with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding applications.
- Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in harsh environments.
- Precise thread engagement with Class 3A fit and UNC coarse threads, ensuring secure fastening and vibration resistance.
- Easy installation and removal using a standard 5/32" hex drive, compatible with common tools for efficient assembly.
- Low-profile rounded button head design provides a smooth finish and reduces snagging in tight spaces.
- Full threading along the 1" length offers maximum grip and adjustability across the entire fastener.
- Compliance with major industry standards including ASME B18.3 and ASTM F835, guaranteeing quality and interoperability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel button head screws address common challenges like corrosion, high stress, and assembly efficiency. The Class 3A thread fit and UNC coarse threads ensure tight, reliable connections that resist loosening under vibration, making them ideal for machinery, automotive, and construction assemblies. The hex drive allows for quick, tool-friendly installation, while the rounded head profile minimizes protrusion and improves safety. With a tensile strength of 120,000 psi, they provide robust performance in structural and load-bearing scenarios, reducing maintenance needs and enhancing operational reliability.
Specification Summary & Compliance
This screw features precise Class 3A thread fit per UNC standards, with dimensions including a 1/4"-20 thread size, 1" length, and 0.437" head diameter. It is manufactured in compliance with ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable usage in global markets.
