S-99477A103 2-56 x 1/2" 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
- Exceptional corrosion resistance with polypropylene construction, eliminating rust concerns in humid or chemical environments
- Reliable mechanical performance with 4500 psi tensile strength for secure fastening in industrial assemblies
- Broad temperature tolerance (-20° to 180° F) ensuring consistent performance across diverse operating conditions
- Precision Class 2A thread fit providing smooth installation and vibration-resistant connections
- Standard hex drive compatibility (5/64") enabling quick installation with common tools
- Full-threaded design maximizing grip strength and load distribution along the entire fastener length
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)
Professional Applications & Engineering Value
These polypropylene socket head cap screws deliver critical advantages in applications where metal fasteners would corrode or conduct electricity. The 2-56 UNC coarse thread configuration ensures rapid installation while maintaining holding power in plastic assemblies, electronic enclosures, and laboratory equipment. The off-white color provides visual contrast for quality control inspections, and the hex drive socket head design allows for high-torque installation without stripping. Engineered for industrial plastic fastening solutions, these screws maintain dimensional stability across the specified temperature range, preventing loosening due to thermal expansion differences in multi-material assemblies.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 2A thread fit tolerances ensuring consistent engagement. The UNC coarse thread (2-56) follows standardized inch system dimensions with fully threaded design from head to tip. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances. The polypropylene material meets UL 94 HB flammability rating standards, providing additional safety assurance for various industrial applications.
