S-92929A128 4-40 x 9/32" ASME B18.6.3 Plastic Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant nylon plastic construction eliminates rust and galvanic corrosion in sensitive environments.
• Standard 82° countersink angle ensures a flush, secure fit for a clean and professional finish.
• Full threading and Class 2A thread fit provide maximum grip and reliable engagement in plastic or soft materials.
• Wide operating temperature range (-40° to 185° F) offers dependable performance in varied thermal conditions.
• Coarse UNC thread pattern enables faster installation and reduced risk of cross-threading.
• Compliance with ASME B18.6.3 guarantees dimensional consistency and interchangeability.
• RoHS 3 compliance ensures the product is free from hazardous substances for safer use.

Professional Applications & Engineering Value

This 4-40 UNC nylon plastic flat head screw is engineered to solve critical challenges in electronics, automotive, and consumer goods assembly. Its non-conductive and corrosion-resistant properties prevent short circuits and material degradation, making it ideal for housings, panels, and components exposed to moisture or chemicals. The slotted drive and fully threaded design facilitate quick manual assembly, while the standard 82° countersink allows the screw head to sit perfectly flush, avoiding protrusions that could damage wires or impede movement. Manufactured to ASME B18.6.3 specifications, it delivers the precision and reliability required for high-volume B2B production lines.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit tolerances for consistent assembly. The UNC coarse thread and right-hand direction follow standardized inch system measurements. Manufacturing and material composition comply with ASME B18.6.3 for dimensional accuracy and RoHS 3 (2015/863/EU) for environmental safety, ensuring a product suitable for regulated industries.