S-91255A099 3-56 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 on alloy steel, ideal for harsh industrial environments.
- Exceptional tensile strength of 120,000 psi ensures reliable, high-load fastening without failure.
- Precise Class 3A thread fit guarantees tight, secure connections with minimal backlash in fine-thread applications.
- Hex drive compatibility (1/16") allows for easy installation and removal with standard tools, reducing assembly time.
- Fully threaded design maximizes grip and load distribution along the entire 1/4" length for enhanced stability.
- High hardness (Rockwell C39) provides excellent wear resistance and durability under repetitive stress.
- Compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH ensures safety, quality, and environmental standards are met.
Professional Applications & Engineering Value
This 3-56 UNF fine thread rounded head screw is engineered to address critical challenges in precision assemblies, such as electronics, aerospace, and automotive components. The black-oxide alloy steel construction offers enhanced corrosion resistance, reducing maintenance needs in humid or chemically exposed settings. Its fine thread and Class 3A fit provide superior vibration resistance and sealing capabilities, preventing loosening in dynamic applications. The hex drive and button head style facilitate quick, tool-friendly installation in confined spaces, while the fully threaded design ensures uniform stress distribution. Ideal for demanding industrial fastening, it delivers reliability where high strength and compliance with standards like ASME B18.3 are paramount.
Specification Summary & Compliance
This screw features a Class 3A thread fit with precise UNF fine threads (3-56 size) and a length of 1/4", ensuring dimensional accuracy per ASME B18.3 and ASTM F835 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industries without hazardous substances.
