S-91321A129 1/4"-20 x 3/4" MS35190-289, NASM35190 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant cadmium plating extends service life in demanding industrial environments
• High 60,000 psi tensile strength provides reliable fastening performance under substantial loads
• Fully threaded design ensures maximum grip and uniform stress distribution along the entire length
• Standard 82° countersink angle allows for flush mounting and clean aesthetic finish
• Class 2A thread fit with UNC coarse threading enables quick assembly and reliable engagement
• Phillips No. 3 drive system offers familiar, efficient installation with standard tools
• MS35190-289/NASM35190 compliance guarantees consistent quality and aerospace-grade specifications

Professional Applications & Engineering Value

This cadmium-plated steel flat head screw delivers exceptional performance in critical industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading and Class 2A thread fit provides excellent engagement in various materials while resisting vibration-induced loosening. The fully threaded design maximizes contact surface area, distributing stress evenly to prevent point failures. With its standard 82° countersink angle and flat head profile, this screw creates seamless, flush surfaces ideal for machinery, equipment assembly, and aerospace components where both function and appearance matter. The Phillips drive system ensures compatibility with common installation tools, streamlining production processes.

Specification Summary & Compliance

This 1/4"-20 UNC flat head screw features precise Class 2A thread fit tolerances and coarse thread spacing per Unified National Coarse standards. Manufacturing complies with MS35190-289 (NASM35190) specifications, ensuring consistent dimensional accuracy and performance characteristics. The cadmium-plated steel construction meets industrial corrosion protection requirements while maintaining 60,000 psi tensile strength. The screw's standard 82° countersink angle and fully threaded 3/4" length provide reliable fastening solutions for professional applications demanding precision and durability.