S-99477A124 1/4"-20 x 3" ASME B18.3, UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Superior chemical and moisture resistance due to polypropylene construction, ideal for harsh environments where metal fasteners corrode.
• Reliable tensile strength of 4500 psi provides secure, durable fastening for a wide range of industrial applications.
• Wide operating temperature range from -20° to 180° F ensures consistent performance and dimensional stability in varied conditions.
• Precise Class 2A thread fit with UNC coarse threads for easy, rapid assembly and reduced risk of cross-threading.
• Hex socket drive design allows for high-torque installation and a clean, low-profile finish in confined spaces.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees product quality, safety, and environmental responsibility for regulated industries.
• Lightweight and non-conductive properties make it perfect for electrical applications and weight-sensitive assemblies.

Professional Applications & Engineering Value

This Polypropylene Socket Head Cap Screw is engineered to solve critical challenges in industrial settings where metal fasteners fall short. Its inherent resistance to a wide range of chemicals, solvents, and moisture prevents degradation and failure, extending the service life of assemblies in chemical processing, water treatment, and outdoor equipment. The UNC coarse thread and Class 2A fit ensure quick and reliable installation, reducing assembly time and labor costs. The hex socket drive is ideal for applications requiring a flush surface or access in tight spaces. As a non-conductive and lightweight plastic fastener, it is indispensable in electrical enclosures, electronic housings, and consumer products, eliminating the risk of galvanic corrosion and short circuits while contributing to overall weight reduction.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, featuring a 1/4"-20 UNC thread with a Class 2A thread fit for consistent and reliable engagement. Manufacturing and quality are governed by the ASME B18.3 specification. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in environmentally conscious and regulated markets.