S-91253A546 1/4"-20 x 1 1/2" 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
- Exceptional tensile strength (130,000 psi) ensures reliable performance under high-stress applications, reducing failure risks.
- Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal backlash.
- Fully threaded UNC coarse design allows for faster installation and stronger holding power in various materials.
- 82° countersink angle and flat head profile enable flush mounting for a clean, snag-free finish.
- Hex drive (5/32") compatibility offers high torque application and easy installation with standard tools.
- High hardness (Rockwell C39) enhances wear resistance, maintaining thread integrity through repeated use.
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw is engineered with black-oxide alloy steel to address critical industrial challenges, such as vibration loosening and environmental corrosion. The fully threaded coarse design ensures rapid assembly in machinery, automotive, and structural applications, while the Class 3A thread fit guarantees precise engagement, minimizing the risk of strip-out in high-cycle operations. Its 82° countersink angle allows for seamless integration into countersunk holes, providing a smooth surface that prevents interference in moving parts. Ideal for heavy-duty industrial screws requirements, this fastener delivers consistent performance where reliability and compliance with stringent standards are paramount.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances, this screw adheres to UNC coarse thread standards for optimal compatibility. It meets ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and use in global markets.
