S-91255A547 1/4"-20 x 2 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 for prolonged service life in demanding industrial environments
- Superior tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 3A thread fit provides secure fastening with minimal risk of cross-threading during installation
- Hex drive design enables high-torque application and easy installation in confined spaces
- Partially threaded shank allows for controlled clamping force and precise joint positioning
- Rounded button head profile offers a finished appearance while reducing surface snagging hazards
- Comprehensive compliance with major industrial standards ensures consistent quality and reliability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this black-oxide alloy steel hex screw combines exceptional strength characteristics with reliable corrosion protection. The 1/4"-20 UNC coarse thread configuration ensures rapid installation and secure fastening in various materials, while the partially threaded design provides optimal clamp load distribution. Ideal for machinery assembly, structural frameworks, and equipment manufacturing, this fastener addresses common challenges of vibration resistance and environmental durability. The rounded head profile minimizes stress concentration points, making it particularly valuable in applications where surface clearance and safety are critical considerations.
Specification Summary & Compliance
This 2 1/2" length screw features Class 3A thread fit precision with UNC coarse threading and partial threading configuration. Manufactured to exacting ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for industrial components. With Rockwell C39 hardness and verified 120,000 psi tensile strength, this screw delivers consistent performance across demanding applications.
