S-99477A123 1/4"-20 x 2 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
- High tensile strength of 4500 psi ensures reliable load-bearing capacity in demanding applications.
- Broad temperature resistance from -20°F to 180°F maintains integrity in varied thermal environments.
- Class 2A thread fit provides consistent, smooth assembly with reduced risk of cross-threading.
- Durable polypropylene construction offers excellent corrosion resistance and lightweight performance.
- Hex socket drive design allows for secure tool engagement and high torque application without slippage.
- Compliance with ASME B18.3 ensures dimensional accuracy and interchangeability with standard components.
- RoHS 3 and REACH compliance guarantees environmental safety and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This 1/4"-20 UNC thread socket head cap screw is engineered from polypropylene plastic to address common industrial challenges such as corrosion, electrical insulation needs, and weight reduction. Its coarse thread design and Class 2A fit enable quick, reliable fastening in materials like plastics, wood, and soft metals, reducing installation time and minimizing thread wear. The hex drive and fully threaded body provide uniform clamping force, making it ideal for assembly lines, electronic enclosures, and machinery where temperature fluctuations and chemical exposure are concerns. By meeting ASME B18.3 standards, it ensures compatibility and performance consistency in industrial plastic fastener applications, enhancing operational efficiency and product longevity.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit per UNC standards, with precise dimensions including a 1/4"-20 thread size and 2-1/2" length. It conforms to ASME B18.3 for socket head cap screws, ensuring dimensional accuracy and reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use in various industries.
