S-91221A186 1/4"-20 x 1 1/4" UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Lightweight Performance: Glass-filled nylon construction provides superior strength-to-weight ratio and excellent resistance to corrosion, eliminating rust concerns in humid or chemical environments.
• Reliable High-Temperature Operation: Withstands temperatures from -20° to 230° F, ensuring stable performance in applications with thermal cycling or elevated heat.
• Secure Hex Drive Fastening: The 3/16" hex socket drive offers positive torque transmission, reducing the risk of cam-out and tool slippage for consistent, reliable installations.
• Precision UNC Coarse Threads: Class 2A thread fit ensures easy, quick assembly and reliable engagement, minimizing cross-threading and speeding up production lines.
• Comprehensive Regulatory Compliance: Meets UL 94 HB flammability standards and is RoHS 3 & REACH compliant, guaranteeing safety and environmental responsibility for global industrial use.
• Versatile Right-Hand Thread Design: Standard UNC 1/4"-20 thread size offers broad compatibility with common nuts and tapped holes, simplifying inventory and replacement.
• Robust Socket Head Profile: Standard socket head with 3/8" diameter and 1/4" height provides a low-profile, high-strength fastening solution that withstands high torque demands.

Professional Applications & Engineering Value

This glass-filled nylon socket head cap screw is engineered to solve critical challenges in industrial settings where metal fasteners fall short. Its non-conductive and corrosion-resistant properties make it ideal for electrical enclosures, food processing equipment, and marine applications, preventing galvanic corrosion and electrical shorts. The UNC coarse thread and Class 2A fit ensure rapid assembly with reduced risk of stripping in plastic or soft materials, while the hex drive design allows for high-torque installation without head deformation. Capable of operating in a temperature range from -20° to 230° F, it provides reliable performance in environments with thermal fluctuations, from automotive components to outdoor machinery. The UL 94 HB, RoHS 3, and REACH compliance further ensures it meets stringent safety and environmental standards, making it a trusted choice for OEMs and MRO professionals seeking durable, compliant plastic fasteners.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a precise Class 2A thread fit for consistent engagement and dimensional accuracy. It is manufactured to meet UL 94 HB specifications for flammability resistance and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries worldwide.