S-99477A107 4-40 x 3/8" 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 from polypropylene plastic construction, ideal for harsh chemical environments without risk of rust or galvanic corrosion
- Reliable 4500 psi tensile strength provides secure fastening for medium-duty industrial applications while maintaining lightweight properties
- Wide operating temperature range (-20° to 180° F) ensures consistent performance across diverse environmental conditions
- Precision Class 2A thread fit with UNC coarse threads enables quick assembly and vibration resistance in right-hand applications
- Standard hex socket drive (3/32") allows for secure tool engagement and controlled torque application during installation
- Full compliance with industry standards including ASME B18.3 specifications and environmental regulations (RoHS 3, REACH) for global manufacturing acceptance
- Fully threaded design maximizes engagement surface area for superior holding power across the entire 3/8" length
Professional Applications & Engineering Value
These 4-40 UNC socket head cap screws deliver critical engineering advantages where metal fasteners would be problematic. The polypropylene plastic construction eliminates corrosion concerns in chemical processing, food equipment, and marine applications while providing excellent electrical insulation properties. The coarse thread design with Class 2A fit ensures reliable performance in vibration-prone assemblies, while the hex drive configuration provides superior torque transmission compared to slotted alternatives. These fully threaded screws maintain consistent 4500 psi tensile strength across the entire -20° to 180° F temperature range, making them ideal for thermal cycling environments where metal expansion differentials would cause failure.
Specification Summary & Compliance
These socket head cap screws feature precision 4-40 UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in global industrial applications. The fully threaded 3/8" length design maintains uniform mechanical properties throughout the fastener.
