S-91321A111 4-40 x 3/16" MS35190-220, NASM35190 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with cadmium plating for extended service life in demanding industrial environments
• Exceptional tensile strength rated at 60,000 psi ensures reliable performance under high-stress applications
• Precision Class 2A thread fit provides consistent, secure fastening with reduced risk of cross-threading
• Optimized 82° countersink angle with undercut flat head design creates flush surface finishes and prevents material protrusion
• Enhanced drive engagement through Phillips No. 1 drive style enables efficient installation with standard tools
• Full threading coverage along the 3/16" length maximizes grip strength and load distribution
• Industry-standard compliance with MS35190-220 (NASM35190) specifications guarantees consistent quality and reliability

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver critical engineering solutions where space constraints and surface finish requirements are paramount. The cadmium-plated steel construction provides essential corrosion protection while maintaining the 60,000 psi tensile strength needed for demanding applications. The undercut flat head profile with 82° countersink angle ensures perfect flush mounting in precision assemblies, eliminating protrusion issues that can compromise equipment function. The coarse UNC threading with Class 2A fit offers excellent engagement in various materials while the Phillips drive facilitates efficient installation in confined spaces. These screws are engineered for critical applications in aerospace, electronics, machinery, and industrial equipment where reliability and precision are non-negotiable.

Specification Summary & Compliance

This 4-40 UNC flat head screw features precision Class 2A thread fit with right-hand coarse threading and full thread coverage along its 3/16" length. Manufactured to exacting MS35190-220 (NASM35190) specifications, these screws maintain consistent dimensional accuracy with 0.225" head diameter and 0.047" head height. The cadmium-plated steel construction meets industry standards for corrosion resistance while delivering 60,000 psi tensile strength. The product complies with relevant industrial specifications for quality and performance in demanding fastening applications.