S-99477A122 1/4"-20 x 1 3/4" ASME B18.3, UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance and chemical stability from Polypropylene Plastic construction, ideal for harsh environments without risk of rust or galvanic corrosion.
• Reliable tensile strength of 4500 psi ensures secure fastening in industrial assemblies, providing dependable load-bearing capacity for plastic components.
• Broad temperature tolerance from -20° to 180°F maintains performance in varied thermal conditions, preventing deformation or failure under thermal cycling.
• Precision Class 2A thread fit with UNC coarse threading enables quick, easy installation and reduced cross-threading risk, speeding up assembly lines.
• Hex socket drive design (3/16" drive size) allows for high-torque application with standard tools, ensuring tight, flush fits in confined spaces.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry safety and environmental standards, supporting sustainable and regulated manufacturing.
• Lightweight and non-conductive properties reduce overall assembly weight and eliminate electrical conductivity risks, enhancing safety in sensitive applications.

Professional Applications & Engineering Value

Engineered for demanding industrial plastic fasteners needs, this socket head cap screw addresses common challenges like corrosion, weight, and electrical isolation. The Polypropylene Plastic material offers inherent resistance to moisture, chemicals, and UV exposure, making it ideal for outdoor equipment, food processing machinery, and electrical enclosures where metal fasteners could degrade or cause short circuits. With its UNC coarse thread and Class 2A fit, it ensures rapid installation and vibration resistance in assemblies requiring repeated maintenance. The hex drive and standard socket head profile facilitate secure tightening even in tight access areas, reducing labor time and improving reliability in industrial applications from automotive to consumer electronics.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 2A thread fit for precise dimensional accuracy and coarse spacing to enhance grip. Manufactured in accordance with ASME B18.3 specifications, it ensures consistent quality and interchangeability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets strict environmental and health standards, supporting global supply chain requirements for hazardous substance-free components.