S-93939A716 4-40 x 5/16" Plastic Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Excellent corrosion resistance due to nylon plastic construction, eliminating rust and galvanic compatibility issues in sensitive environments.
• Superior electrical insulation properties make it ideal for electronic assemblies and applications requiring non-conductive fasteners.
• Wide operating temperature range from -40° to 185° F ensures reliable performance in both cold and moderately high-heat conditions.
• Easy manual installation and adjustment with the standard slotted drive, compatible with common hand tools.
• Secure and precise thread engagement guaranteed by the Class 2A thread fit and 4-40 UNC coarse threading, reducing cross-threading risks.
• Lightweight design reduces overall assembly weight without compromising on fastening strength for non-structural applications.
• Compliance with RoHS 3 regulations ensures environmental safety and meets international standards for hazardous substance restrictions.

Professional Applications & Engineering Value

This nylon plastic rounded head screw is engineered to address common challenges in electrical, electronic, and lightweight assembly applications. Its non-conductive and non-magnetic properties prevent electrical shorts and interference, making it a safe choice for securing components on PCBs, electrical enclosures, and instrumentation. The fillister-style rounded head provides a low-profile finish with a larger bearing surface, distributing clamp load effectively on delicate materials. With a fully threaded 4-40 UNC coarse thread and Class 2A thread fit, it offers quick assembly and high vibration resistance in plastics and soft metals. The material's inherent corrosion resistance eliminates the need for additional plating or coatings, reducing part complexity and cost while maintaining performance across a broad temperature range from -40° to 185° F.

Specification Summary & Compliance

This screw adheres to Unified National Coarse (UNC) thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. Manufactured from durable Nylon Plastic with a slotted drive and right-hand thread direction, it is fully compliant with RoHS 3 (2015/863/EU) regulations, ensuring it is free from restricted hazardous substances. The specified dimensions include a 5/16" length, 0.183" head diameter, and coarse thread spacing, suitable for use in inch-system based designs and assemblies.