S-91255A533 1/4"-20 x 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
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
- High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration.
- Precision Class 3A thread fit provides consistent, secure fastening with minimal risk of cross-threading.
- 5/32" hex drive design allows for easy installation and removal with standard tools, reducing assembly time.
- Fully threaded shank offers maximum grip and load distribution across the entire length.
- Rockwell C39 hardness maintains thread integrity and resists wear during repeated use.
- Compliant with ASME B18.3 and ASTM F835, ensuring adherence to industry standards for quality and safety.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 1/4"-20 UNC hex drive button head screws deliver exceptional reliability in machinery, automotive, and electronic assemblies. The black-oxide alloy steel construction provides excellent corrosion resistance, reducing maintenance needs in humid or chemically exposed settings. With a coarse thread and Class 3A fit, they ensure quick, secure fastening even in high-vibration environments, minimizing loosening risks. The rounded button head offers a low-profile finish, ideal for spaces where clearance is limited. These screws address common pain points like thread stripping and material fatigue, offering a durable solution that enhances assembly longevity and operational safety.
Specification Summary & Compliance
This product features precise UNC coarse threads with Class 3A fit, ensuring tight tolerances per ASME B18.3 and ASTM F835 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety. The screw maintains consistent dimensions, including a 1/4" length and 0.437" head diameter, for reliable performance in standardized applications.
