S-90920A287 1/4"-20 x 5/8" ASME B18.6.3 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating for extended service life in demanding industrial environments
• Enhanced torque transmission and reduced cam-out with T27 Torx drive for secure, efficient installation
• High tensile strength of 60,000 psi ensures reliable performance in heavy-duty applications
• Optimal flush mounting with standard 82° countersink angle and flat head design
• Wide compatibility with UNC coarse 1/4"-20 threads and Class 2A fit for versatile use
• Full threading along 5/8" length provides maximum grip and load distribution
• Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver exceptional engineering value in industrial settings where vibration resistance and long-term reliability are critical. The T27 Torx drive system prevents tool slippage during high-torque applications, reducing installation damage and improving worker safety. With 1/4"-20 UNC coarse threading and Class 2A thread fit, these fasteners provide secure engagement in various materials while the 82° countersink angle ensures flush mounting in precision assemblies. Ideal for machinery, automotive, and construction applications, these screws address common challenges of fastener failure, corrosion, and installation efficiency through their robust 60,000 psi tensile strength and protective zinc coating.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance with 1/4"-20 UNC coarse threads and full threading along its 5/8" length. Manufactured to ASME B18.6.3 specifications with standard 82° countersink profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.