S-91221A112 2-56 x 1/4" UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional chemical resistance from glass-filled nylon construction, ideal for harsh industrial environments
• Reliable thermal performance with stable operation from -20° to 230° F (-29° to 110° C)
• Precision Class 2A thread fit ensures consistent engagement and vibration-resistant fastening
• Standard UNC coarse threads provide faster assembly and reduced cross-threading risks
• Full-length threading delivers maximum grip strength across the entire fastener length
• Regulatory compliance with UL 94 HB flammability rating, RoHS 3, and REACH standards
• Corrosion-free performance in applications where metal fasteners would degrade

Professional Applications & Engineering Value

These glass-filled nylon socket head cap screws solve critical engineering challenges in chemical processing, electrical enclosures, and food handling equipment where metal corrosion and electrical conductivity pose problems. The 2-56 UNC coarse threads with Class 2A fit maintain precise tolerances while the 5/64" hex drive provides secure tool engagement. The material's inherent thermal stability (-20° to 230° F) ensures dimensional integrity in temperature-cycling environments, while the off-white color offers visual contrast for inspection. These fully threaded screws deliver consistent clamping force in plastic assemblies, electronic components, and medical devices where non-conductive, non-magnetic properties are essential.

Specification Summary & Compliance

Manufactured to inch system specifications with 2-56 UNC coarse threads meeting Class 2A thread fit tolerances for reliable engagement. These socket head cap screws comply with UL 94 HB flammability standards and are fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant. The glass-filled nylon material provides consistent mechanical properties while maintaining regulatory compliance for restricted substances.