S-91255A634 3/8"-16 x 2 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 tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- Full threading design allows for maximum grip length and uniform load distribution, enhancing joint integrity.
- Hex drive (7/32") with button head offers easy installation and a low-profile finish, ideal for spaces with clearance constraints.
- High hardness (Rockwell C39) maintains thread integrity and resists wear during repeated use, lowering long-term maintenance costs.
- Coarse UNC threads enable quick assembly and disassembly, boosting efficiency in production and maintenance workflows.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Black-Oxide Alloy Steel button head screw addresses critical challenges in machinery, automotive, and structural assemblies. The 3/8"-16 UNC coarse thread and Class 3A fit ensure rapid, secure fastening even in high-vibration settings, reducing assembly time and preventing thread stripping. Its fully threaded construction distributes stress evenly, while the rounded head and hex drive provide a flush finish and tool accessibility in confined spaces. Compliant with ASME B18.3 and ASTM F835, it delivers consistent quality for OEM and MRO needs, supporting robust performance in corrosive or high-load environments.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNC standards, with precise dimensions (e.g., 2-1/4" length, 0.656" head diameter). It meets ASME B18.3 and ASTM F835 specifications for manufacturing consistency, and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence in global supply chains.
