S-91771A113 4-40 x 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional tensile strength of 80,000 PSI ensures reliable performance under high-stress applications
- Precise Class 2A thread fit provides smooth installation and secure fastening in coarse UNC threads
- Optimized flush mounting with standard 82° countersink angle for seamless surface integration
- Full threading along 3/4" length delivers maximum grip and uniform load distribution
- Consistent Rockwell B80 hardness maintains structural integrity through repeated use
- Broad compliance coverage with ASME B18.6.3, RoHS 3 and REACH regulations for global applications
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical performance advantages in precision assembly applications where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for electronics enclosures, machinery panels, and marine components. The Phillips drive combined with the 82° countersink angle ensures secure seating without protrusion, while the coarse UNC threading facilitates rapid installation in various materials. With 80,000 PSI tensile strength and full threading, these fasteners maintain joint integrity in vibration-prone environments, reducing maintenance cycles and improving equipment reliability across industrial sectors.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. The 4-40 UNC coarse thread configuration ensures reliable engagement while the fully threaded 3/4" length provides maximum fastening capability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting international standards for industrial components.
