S-99477A106 4-40 x 5/16" 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 plastic construction, ideal for chemical and moisture-rich environments
- Reliable 4500 psi tensile strength ensures secure fastening in demanding industrial applications
- Broad temperature tolerance (-20° to 180° F) maintains performance across diverse operating conditions
- Precise Class 2A thread fit guarantees smooth installation and consistent engagement
- Compact 3/32" hex drive design enables easy access in confined spaces with standard tools
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH ensures safety and environmental responsibility
- Coarse UNC threading provides quick assembly and reduced cross-threading risk
Professional Applications & Engineering Value
These polypropylene plastic socket head cap screws deliver critical advantages in applications where metal fasteners fail. The 4-40 UNC coarse thread configuration combined with Class 2A thread fit ensures rapid, reliable installation in plastic components, electronic enclosures, and medical devices where galvanic corrosion must be avoided. The 3/32" hex drive provides superior torque transmission compared to slotted drives, while the 4500 psi tensile strength maintains joint integrity in vibration-prone assemblies. The material's inherent electrical insulation properties and chemical resistance make these socket head cap screws ideal for electrical panels, laboratory equipment, and food processing machinery where non-conductive, non-contaminating fasteners are essential.
Specification Summary & Compliance
This socket head cap screw features precision 4-40 UNC coarse threads with Class 2A fit per ASME standards, ensuring consistent dimensional accuracy. The 5/16" length and standard socket head profile provide reliable fastening performance. Manufacturing complies with ASME B18.3 specifications where applicable, with full adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, including compliance with the latest SVHC requirements. The right-hand thread direction and fully threaded design deliver uniform clamping force throughout the fastener length.
