S-99477A119 1/4"-20 x 1/4" ASME B18.3, UL 94 HB Plastic Socket Head Screws
Plastic Socket 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 polypropylene construction, ideal for harsh chemical and moisture environments without rust or degradation
- Reliable thread engagement with Class 2A fit UNC coarse threads ensuring easy assembly and vibration resistance in industrial applications
- High tensile strength of 4500 psi provides dependable load-bearing capacity for plastic assembly requirements
- Wide temperature tolerance from -20° to 180°F maintains performance across various operating conditions
- Hex socket drive design allows for secure tool engagement and precise torque application in confined spaces
- Full compliance with ASME B18.3 standards guarantees dimensional accuracy and interchangeability
- Environmental regulation compliance with RoHS 3 and REACH ensures safe use in regulated industries
Professional Applications & Engineering Value
These polypropylene socket head cap screws deliver exceptional value in applications where metal fasteners would corrode or cause galvanic reactions. The 1/4"-20 UNC coarse threads with Class 2A fit provide excellent engagement in plastic components, reducing stripping risks while the hex drive system ensures reliable installation torque control. Ideal for electrical enclosures, food processing equipment, chemical containers, and marine applications, these off-white plastic screws offer electrical insulation properties and won't conduct heat or electricity. The 4500 psi tensile strength combined with the -20° to 180°F temperature range makes them suitable for both indoor and outdoor industrial assemblies where durability and chemical resistance are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 2A thread fit ensuring precise dimensional accuracy and interchangeability. These fully threaded fasteners feature UNC coarse threads with right-hand direction and standard socket head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for use in regulated industries and international markets. The inch system measurement provides compatibility with North American standard components and tooling.
