S-91321A128 1/4"-20 x 1/2" MS35190-287, NASM35190 Steel Phillips Flat Head Screws
Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with cadmium-plated steel construction for extended service life in demanding environments
- High tensile strength of 60,000 PSI ensures reliable performance under significant mechanical stress
- Fully threaded design provides maximum grip and uniform load distribution across the entire fastener length
- 82° countersink angle enables flush mounting for clean, aerodynamic surfaces and reduced snag hazards
- Class 2A thread fit offers excellent assembly compatibility while maintaining secure fastening integrity
- No. 3 Phillips drive allows for efficient installation with common industrial tools
- MS35190-287/NASM35190 compliance guarantees consistent quality and reliability for critical applications
Professional Applications & Engineering Value
This 1/4-20 UNC flat head screw delivers exceptional engineering value through its cadmium-plated steel construction and precision coarse thread design. The combination of 60,000 PSI tensile strength and fully threaded configuration addresses common industrial challenges by preventing joint loosening under vibration while maintaining structural integrity. The 82° countersink angle and flat head profile create seamless surface transitions ideal for aerospace components, machinery assemblies, and electronic enclosures where protrusion-free mounting is critical. The Phillips drive ensures straightforward installation in confined spaces, making these industrial screws particularly valuable for maintenance operations and production line applications requiring both reliability and efficiency.
Specification Summary & Compliance
This fastener maintains precise Class 2A thread fit tolerances per UNC (Unified National Coarse) standards with 1/4"-20 threading in right-hand direction. Manufactured to meet MS35190-287 (NASM35190) specifications, ensuring consistent dimensional accuracy and performance reliability. The inch system measurements guarantee compatibility with North American industrial equipment and existing fastener inventories.
