S-91253A393 1/2"-20 x 3 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
- Exceptional tensile strength of 130,000 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 extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Partially threaded design allows for controlled clamping force, ideal for materials requiring specific grip range without over-tightening.
- 82° countersink angle enables a flush, low-profile installation, minimizing protrusion and improving safety in moving parts.
- Hex drive compatibility with 5/16" drive size offers easy installation and removal using standard tools, speeding up assembly processes.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, supporting sustainable procurement.
Professional Applications & Engineering Value
This 1/2"-20 UNF flat head screw is engineered to address common industrial challenges such as vibration loosening and corrosion in demanding settings. Crafted from black-oxide alloy steel, it combines high Rockwell C39 hardness with a fine thread spacing to maintain integrity under dynamic loads, making it ideal for heavy-duty machinery, automotive assemblies, and structural frameworks. The partially threaded configuration and Class 3A thread fit ensure precise engagement, reducing the need for frequent maintenance and enhancing operational reliability in applications where tensile strength and durability are critical.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for high precision in UNF fine threads, with a thread size of 1/2"-20 and minimum thread length of 1 1/2". Manufactured in compliance with ASTM F835 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory conformity for industrial use.
