S-91263A382 4-48 x 3/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance provided by zinc-plated alloy steel extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit guarantees tight, secure connections with minimal backlash, enhancing assembly accuracy and vibration resistance.
• Fully threaded design allows for maximum grip and load distribution along the entire length, improving joint stability.
• 82° countersink angle and flat head profile enable flush mounting for a clean, professional finish and reduced snagging risks.
• 1/16" hex drive facilitates easy installation and removal with standard tools, speeding up assembly processes.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous quality and environmental standards, supporting sustainable procurement.

Professional Applications & Engineering Value

Engineered for precision and durability, this 4-48 UNF flat head screw is ideal for applications requiring high-strength fastening with fine thread engagement. The zinc-plated alloy steel construction combats corrosion in industrial settings like machinery, automotive assemblies, and electronic enclosures, where exposure to moisture and chemicals is common. Its Class 3A thread fit and fully threaded design provide superior clamping force and resistance to loosening under vibration, addressing common failure points in dynamic systems. The 82° countersink angle ensures a seamless fit in pre-drilled holes, minimizing protrusion and enhancing safety. By integrating these features, it delivers reliable performance in heavy-duty fasteners for OEM and MRO needs, reducing maintenance cycles and downtime.

Specification Summary & Compliance

This screw adheres to inch system dimensions with a 4-48 UNF fine thread and Class 3A tolerance for precise fit. It meets ASTM F835 specifications for mechanical properties, ensuring consistent quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental safety and regulatory requirements in global supply chains.