S-91221A213 4-40 x 1/4" UL 94 HB Plastic Socket Head Screws
Plastic Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior chemical resistance from glass-filled nylon construction, ideal for harsh industrial environments
- Wide thermal stability (-20° to 230° F) ensures reliable performance across varying temperature conditions
- Precise Class 2A thread fit with 4-40 UNC coarse threads for secure, vibration-resistant fastening
- Easy installation and removal with standard 3/32" hex drive socket head design
- Lightweight and non-corrosive plastic material reduces component weight without sacrificing durability
- Full regulatory compliance with UL 94 HB, RoHS 3, and REACH standards for global market acceptance
- Cost-effective alternative to metal screws where electrical insulation or chemical resistance is critical
Professional Applications & Engineering Value
These glass-filled nylon socket head cap screws provide engineering solutions where metal fasteners fail. The 4-40 UNC coarse threads with Class 2A fit maintain secure connections in vibrating equipment, while the off-white plastic construction eliminates galvanic corrosion in multi-material assemblies. With exceptional chemical resistance and thermal stability from -20° to 230° F, they're ideal for electrical enclosures, food processing equipment, marine components, and chemical handling systems where non-conductive, non-magnetic properties are essential. The 3/32" hex drive socket head ensures consistent torque application without stripping, making them perfect for repeated maintenance access in tight spaces.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit per UNC standards, these screws feature fully threaded design for maximum engagement. Compliance includes UL 94 HB flammability rating, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) for chemical safety. The right-hand coarse threads and standardized socket head profile ensure compatibility with existing tooling and assembly processes.
