S-99477A105 4-40 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 chemical and moisture resistance from Polypropylene Plastic construction, ideal for harsh industrial environments
- Reliable 4500 psi tensile strength ensures secure fastening in demanding applications without metal corrosion risks
- Broad temperature tolerance (-20° to 180°F) maintains performance stability across varied operating conditions
- Precise Class 2A thread fit guarantees smooth installation and consistent engagement with UNC coarse threads
- Compact 3/32" hex drive design allows easy access in confined spaces with standard tools
- Full compliance with ASME B18.3 standards delivers guaranteed dimensional accuracy and interchangeability
- Environmentally safe composition meeting RoHS 3 and REACH regulations for sustainable manufacturing
Professional Applications & Engineering Value
These Polypropylene Plastic socket head cap screws solve critical challenges in electrical, chemical processing, and food-grade applications where metal fasteners would corrode or contaminate. The 4-40 UNC coarse thread provides excellent pull-out resistance in plastic assemblies, while the standard socket head profile ensures uniform torque transmission. With UL 94 HB flammability rating and inherent dielectric properties, these screws prevent galvanic corrosion in multi-material assemblies. The off-white color offers visual contrast for quality control inspections, and the right-hand thread direction maintains compatibility with standard installation procedures across industrial equipment and enclosures.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 2A thread fit ensuring precise dimensional accuracy. The UNC coarse thread spacing (4-40) and fully threaded 1/4" length provide optimal engagement depth. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, containing no SVHC above threshold limits. Temperature performance certified for -20° to 180°F range with consistent mechanical properties.
