S-99477A111 4-40 x 1" 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
- High tensile strength of 4500 psi ensures reliable fastening in demanding applications without risk of failure
- Wide temperature resistance from -20° to 180°F maintains performance in varying thermal environments
- Polypropylene plastic construction offers excellent corrosion resistance and electrical insulation properties
- Class 2A thread fit with UNC coarse threading provides easy installation and secure holding power
- Hex socket drive design with 3/32" drive size enables precise torque application and flush mounting
- Compliance with ASME B18.3 standards guarantees dimensional accuracy and interchangeability
- RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance
Professional Applications & Engineering Value
These polypropylene plastic socket head cap screws with 4-40 UNC threads deliver exceptional value in applications where metal fasteners would corrode or conduct electricity. The off-white color and plastic composition make them ideal for electronics enclosures, food processing equipment, and chemical environments where contamination or galvanic corrosion are concerns. The right-hand coarse threading combined with Class 2A fit ensures quick assembly while maintaining vibration resistance. The hex socket drive allows for high torque application in confined spaces, making these industrial plastic screws perfect for machinery requiring frequent maintenance or adjustment while withstanding temperatures from freezing to near-boiling conditions.
Specification Summary & Compliance
This 1" socket head cap screw features precise Class 2A thread fit with 4-40 UNC coarse threads manufactured to ASME B18.3 specifications. The fastener maintains dimensional accuracy with 0.183" head diameter and 0.112" head height for consistent performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, along with UL 94 HB flammability rating, ensuring suitability for various industrial and commercial applications requiring certified components.
