S-99477A112 4-40 x 1 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
- Excellent corrosion resistance with polypropylene construction, ideal for humid or chemical environments without rust concerns
- Reliable 4500 psi tensile strength ensures secure fastening in industrial assemblies without risk of premature failure
- Broad temperature tolerance (-20° to 180° F) maintains performance in varied operating conditions
- Hex socket drive design provides superior torque transmission and prevents stripping during installation
- Class 2A thread fit with UNC coarse threading offers quick assembly and vibration resistance in plastic components
- Full compliance with ASME B18.3 standards guarantees dimensional accuracy and interchangeability
- RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance in global markets
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this polypropylene socket head cap screw solves critical challenges in plastic assembly applications where metal fasteners would cause galvanic corrosion or electrical isolation issues. The 4-40 UNC coarse thread design provides excellent pull-out resistance in plastic housings and electronic enclosures, while the hex drive system ensures consistent clamping force without cam-out incidents. With its 4500 psi tensile strength and temperature stability, this fastener maintains structural integrity in automotive components, electrical insulation systems, and food processing equipment where chemical resistance and non-conductive properties are essential.
Specification Summary & Compliance
This 1-1/2" socket head cap screw features precise Class 2A thread fit per UNC standards with coarse thread spacing for optimal engagement in plastic materials. Manufacturing conforms to ASME B18.3 specifications for dimensional accuracy, while meeting RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The off-white polypropylene material provides UL 94 HB flammability rating suitability for various industrial applications.
