S-91255A537 1/4"-20 x 1/2" 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, ideal for harsh industrial environments.
- Superior tensile strength of 120,000 psi ensures reliable performance in high-stress applications.
- Precise Class 3A thread fit provides secure, vibration-resistant connections with minimal risk of loosening.
- Fully threaded UNC coarse spacing allows for faster installation and stronger holding power in various materials.
- Rounded button head with hex drive offers a low-profile, flush finish and easy torque application with standard tools.
- High Rockwell C39 hardness enhances durability and wear resistance for long service life.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in professional assemblies.
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head hex screw is engineered to address common industrial challenges, such as corrosion and mechanical stress. The black-oxide surface treatment provides a protective layer that reduces oxidation and extends lifespan in moist or abrasive conditions, making it suitable for machinery, automotive, and construction applications. With a coarse UNC thread and Class 3A fit, it ensures quick, secure fastening in metals and plastics, minimizing assembly time and preventing thread stripping. The rounded button head design offers a smooth, low-profile finish that reduces snagging and improves safety in moving parts. Ideal for heavy-duty fastening, this screw delivers reliable performance where high tensile strength and durability are critical, supporting efficient maintenance and production workflows.
Specification Summary & Compliance
This screw features precise dimensions, including a 1/4"-20 UNC thread with Class 3A fit for tight tolerances and coarse spacing. It meets ASME B18.3 and ASTM F835 specifications, ensuring consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety standards in global supply chains.
