S-90429A122 3-48 x 1" 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 in demanding industrial environments, reducing the risk of fastener failure.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance and a durable, non-reflective surface for long-lasting protection.
• Class 3A thread fit offers superior precision and tighter tolerances, minimizing backlash and improving assembly reliability.
• Hex drive design with 1/16" drive size allows for secure tool engagement and high torque application, speeding up installation and reducing slippage.
• 82° countersink angle and flat head profile enable flush mounting in various materials, preventing snagging and ensuring a smooth surface finish.
• Partially threaded UNC coarse thread facilitates easier alignment and faster driving in coarse-grained materials, enhancing installation efficiency.
• Rockwell C39 hardness delivers excellent wear resistance, maintaining thread integrity and durability under repetitive stress.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 3-48 UNC flat head screws address common challenges like vibration loosening and material fatigue. The black-oxide alloy steel construction, combined with a Class 3A thread fit, ensures consistent performance in machinery, automotive assemblies, and electronic enclosures where precise fastening is critical. The hex drive and coarse thread design allow for quick, secure installations in tough materials, reducing downtime. With an 82° countersink angle, they provide a seamless fit, minimizing protrusion and improving safety in high-movement environments. Ideal for OEM and MRO uses, these screws offer reliable tensile strength and compliance with industry standards, making them a trusted choice for engineers seeking durability and efficiency.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threading with a thread size of 3-48. Manufactured in accordance with ASME B18.3 and ASTM F835 specifications, it ensures consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for global industrial use.