S-91253A289 1/4"-20 x 9/16" 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 industrial applications, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh conditions.
- Fully threaded design allows for maximum grip and holding power along the entire length, improving load distribution.
- 82° countersink angle and flat head profile enable flush mounting for a smooth, professional finish and reduced snagging risks.
- Hex drive (5/32") facilitates easy installation with standard tools, saving time and labor in assembly processes.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous safety and environmental standards for global industrial use.
Professional Applications & Engineering Value
Engineered for heavy-duty applications, these 1/4"-20 UNC flat head screws are ideal for machinery, automotive, and construction sectors where vibration resistance and high tensile strength are critical. The black-oxide alloy steel construction combats corrosion, while the coarse UNC threading and Class 3A fit provide secure fastening in materials prone to stress. The 82° countersink angle ensures a flush fit, minimizing protrusions in assembled components. With full threading and a hex drive, they offer quick installation and reliable performance, reducing maintenance needs in industrial settings.
Specification Summary & Compliance
This screw features precise Class 3A thread fit and UNC coarse threading with a diameter of 0.25" and length of 9/16". It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
