S-91253A324 1/4"-28 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head 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 130,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
- Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening in critical assemblies.
- Partial threading design allows for optimal clamping force distribution, ideal for materials requiring controlled tension.
- 82° countersink angle enables a flush, professional finish that eliminates protrusion and improves safety in assembled components.
- Hex drive compatibility (5/32") facilitates easy installation and removal with standard tools, saving time during maintenance.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous industry standards for quality and environmental safety.
Professional Applications & Engineering Value
Engineered for industrial and mechanical assemblies, these 1/4"-28 UNF flat head screws address common challenges like vibration-induced loosening and corrosion. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness, provides durability against wear and environmental exposure. The fine thread and Class 3A fit ensure tight, reliable fastening in precision equipment, automotive components, and machinery where high tensile strength is critical. The partially threaded design allows for effective grip length control, reducing stress concentration and enhancing joint integrity in metal and composite materials.
Specification Summary & Compliance
This screw meets precise dimensional standards, including Class 3A thread fit for superior tolerance and UNF fine threading (1/4"-28). Manufactured in accordance with ASTM F835 specifications, it ensures consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally safe and regulated industrial use.
