S-92929A139 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
- Corrosion-resistant nylon plastic construction eliminates rust and galvanic corrosion in sensitive environments
- Wide temperature tolerance (-40° to 185°F) ensures reliable performance across diverse operating conditions
- 100° countersink angle with flat head design provides secure, flush mounting for clean finished appearances
- Class 2A thread fit with UNC coarse threading delivers consistent engagement and easier assembly in plastic materials
- Full threading along the 3/4" length maximizes grip strength and load distribution across the entire fastener
- ASME B18.6.3 compliance guarantees dimensional accuracy and interchangeability with standard components
- RoHS 3 compliance ensures environmental safety and regulatory acceptance for global markets
Professional Applications & Engineering Value
These nylon plastic flat head screws with 4-40 UNC coarse threading solve critical challenges in electrical enclosures, marine components, and food processing equipment where metal fasteners would cause contamination or corrosion. The non-conductive, non-magnetic properties of nylon make these slotted flat head screws ideal for electronic assemblies and sensitive instrumentation. The 100° countersink angle ensures secure, flush mounting in plastic and soft materials, preventing surface damage while maintaining structural integrity. With temperature resistance from -40° to 185°F, these fasteners maintain dimensional stability in both industrial freezing conditions and elevated temperature environments, eliminating the thermal expansion concerns common with metal alternatives.
Specification Summary & Compliance
This 4-40 UNC screw features Class 2A thread fit per ASME standards, ensuring precise dimensional tolerances for reliable mating with corresponding threaded components. Manufacturing complies with ASME B18.6.3 specifications for flat head slotted screws, guaranteeing interchangeability and consistent performance. The product meets RoHS 3 (2015/863/EU) compliance requirements, containing no restricted hazardous substances. All dimensions follow the inch system with 0.225" head diameter and 3/4" length, providing standardized sizing for North American industrial applications.
