S-91253A988 1 1/4"-12 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 in heavy-duty applications, reducing the risk of fastener failure.
- Class 3A thread fit provides tighter tolerances for superior fastening precision and vibration resistance in critical assemblies.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in demanding industrial environments.
- UNF fine threading delivers better load distribution and improved clamping force compared to coarse threads.
- 82° countersink angle allows for a flush fit in standard countersunk holes, minimizing protrusion and improving safety.
- Fully threaded design ensures consistent engagement along the entire length, maximizing holding power in various material thicknesses.
- Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to rigorous industry standards for safety and environmental responsibility.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these flat head hex drive screws address common challenges like vibration loosening and material fatigue. The black-oxide alloy steel construction provides excellent durability and corrosion resistance, making them ideal for machinery, automotive, and structural assemblies where reliability is critical. The UNF fine thread with Class 3A fit ensures precise, secure fastening in high-stress environments, reducing maintenance needs and downtime. With a high tensile strength of 130,000 psi and Rockwell C37 hardness, these screws withstand extreme loads without compromising integrity, offering long-term performance in inch system based projects.
Specification Summary & Compliance
This screw features a 1 1/4"-12 UNF thread with Class 3A fit for precise dimensional accuracy, and is manufactured to meet ASTM F835 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in industrial use.
