S-92929A127 4-40 x 1/4" 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
- Excellent corrosion resistance due to Nylon Plastic construction, eliminating rust issues in humid or chemical environments
- Secure flush mounting with standard flat head profile and 100° countersink angle for smooth surface finishing
- Reliable coarse threading (UNC) provides faster installation and superior holding power in plastic assemblies
- Wide temperature tolerance from -40° to 185°F ensures consistent performance across diverse operating conditions
- Precision Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks
- Full threading along 1/4" length maximizes grip strength and distribution across the entire fastener
- Industry compliance assurance with ASME B18.6.3 specifications and RoHS 3 environmental standards
Professional Applications & Engineering Value
These 4-40 UNC flat head slotted screws deliver critical advantages in industrial plastic assemblies where metal fasteners would cause galvanic corrosion or electrical interference. The Nylon Plastic material provides inherent electrical insulation and chemical resistance, making these slotted fasteners ideal for electronics enclosures, medical devices, and food processing equipment. The 100° countersink angle ensures seamless flush mounting without protrusions, while the coarse UNC threading maintains secure fastening in thermoplastic materials where fine threads might strip. With full threading and right-hand direction, installation becomes consistently reliable across high-volume production lines.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent engagement. Features UNC coarse threads in 4-40 size with 1/4" length and standard flat head profile. Fully compliant with RoHS 3 (2015/863/EU) regulations, containing no restricted hazardous substances. All dimensions conform to inch system measurements with 100° countersink angle standardization.
