S-91263A381 4-48 x 1/4" 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 zinc-plated alloy steel construction, extending service life in harsh industrial environments
- High tensile strength of 130,000 psi ensures reliable fastening under heavy loads and vibration
- Precision Class 3A fine threading provides secure, tight fits with minimal risk of stripping or cross-threading
- 82° countersink angle and standard flat head profile enable flush mounting for streamlined assemblies and improved aesthetics
- Hex drive design with 1/16" drive size allows for easy installation and high torque application without slippage
- Full threading along the 1/4" length offers maximum grip and adjustability in various material thicknesses
- Rockwell C39 hardness delivers excellent wear resistance and durability for repeated use
Professional Applications & Engineering Value
These 4-48 UNF flat head screws are engineered to address critical challenges in precision assembly and high-stress applications. The zinc-plated alloy steel material combats corrosion, making them ideal for electronics, automotive, and machinery where environmental exposure is a concern. The Class 3A fine threading ensures precise engagement in tapped holes, reducing the risk of thread failure in thin materials or delicate components. With an 82° countersink angle, they sit flush to prevent snagging and maintain aerodynamic or aesthetic surfaces. The hex drive facilitates secure tool engagement, speeding up installation in confined spaces while the high tensile strength supports structural integrity in dynamic loads. Fully compliant with industry regulations, these screws provide reliable performance in OEM manufacturing, aerospace subassemblies, and precision instrument repair.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for precise dimensional accuracy and UNF fine thread standards. Manufacturing meets ASTM F835 specifications for consistent quality. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are upheld for global industrial use.
