S-92929A138 4-40 x 3/4" ASME B18.6.3 Plastic Slotted Flat Head Screws
Plastic Slotted 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 from nylon plastic construction eliminates rust and chemical degradation in harsh environments
- Excellent electrical insulation properties prevent current leakage and short circuits in electronic assemblies
- Precise Class 2A thread fit ensures smooth installation and reliable fastening performance in coarse thread applications
- Wide temperature tolerance (-40° to 185°F) maintains structural integrity across diverse operating conditions
- Standard 82° countersink angle provides flush mounting for clean, professional finishes in assembled products
- Full threading design offers maximum grip length and uniform stress distribution along the entire fastener
- Regulatory compliance with ASME B18.6.3 and RoHS 3 ensures quality standards and environmental safety
Professional Applications & Engineering Value
These 4-40 UNC nylon plastic flat head slotted screws deliver critical engineering solutions where metal fasteners fail. The nylon plastic material provides inherent corrosion resistance, making them ideal for humid, chemical, or marine environments while offering complete electrical insulation for sensitive electronic components. The flat head design with standard 82° countersink creates seamless surfaces in assembled products, preventing snagging and maintaining aesthetic integrity. With Class 2A thread fit and coarse UNC threading, these screws install quickly and securely in plastic, wood, and soft metal substrates, reducing assembly time while providing reliable fastening strength. Their fully threaded construction ensures maximum holding power across the entire 3/4" length, distributing load evenly to prevent material stress concentration.
Specification Summary & Compliance
This 4-40 UNC screw features precise Class 2A thread fit tolerances according to inch system standards, with coarse threading measuring 0.112" in diameter. The flat head configuration includes a 0.225" head diameter and 0.067" head height with standard 82° countersink angle. Manufacturing and dimensional compliance meets ASME B18.6.3 specifications, while environmental safety is ensured through RoHS 3 (2015/863/EU) compliance. The right-hand threaded, fully threaded design operates effectively within the specified temperature range of -40° to 185°F.
