S-91221A113 2-56 x 5/16" UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Superior chemical resistance from glass-filled nylon construction, ideal for harsh industrial environments
• Wide temperature tolerance (-20° to 230° F) ensures reliable performance in varying operating conditions
• Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks
• Reinforced hex drive design (5/64") offers excellent torque transmission and strip resistance
• Lightweight non-conductive properties prevent electrical interference and reduce assembly weight
• Regulatory compliance with UL 94 HB, RoHS 3, and REACH standards for global market acceptance
• Coarse UNC threading (2-56) enables quick installation and superior vibration resistance

Professional Applications & Engineering Value

Engineered for precision assemblies requiring chemical resistance and electrical insulation, these glass-filled nylon socket head cap screws solve critical challenges in electronics, automotive, and aerospace applications. The 2-56 UNC coarse threads with Class 2A fit maintain secure fastening under vibration while the off-white material resists degradation from oils, solvents, and UV exposure. The 5/64" hex drive and standardized socket head profile ensure compatibility with automated installation equipment, reducing assembly time and improving manufacturing consistency in high-volume production environments.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit standards with UNC coarse threading (2-56) and 5/16" length dimensions. Compliant with UL 94 HB flammability rating, RoHS 3 (2015/863/EU) restrictions on hazardous substances, and REACH (EC 1907/2006) regulations for chemical safety. Right-hand thread direction and fully threaded design ensure consistent performance across industrial applications.