S-93939A721 4-40 x 3/4" Plastic Fillister Head Slotted Screws
Plastic Fillister Head Slotted 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
- Excellent electrical insulation with nylon plastic construction, ideal for preventing short circuits in sensitive electronic assemblies.
- Superior corrosion and chemical resistance for long-term reliability in harsh or humid industrial environments.
- Wide operating temperature range from -40° to 185° F, ensuring consistent performance in varied thermal conditions.
- Easy installation and adjustment with a standard slotted drive and a high, narrow fillister head for enhanced tool engagement.
- Reliable coarse (UNC) threading with a Class 2A fit for quick assembly and secure fastening in plastic or soft materials.
- Fully threaded shank provides maximum grip and holding power along the entire 3/4" length.
- Compliance with RoHS 3 regulations ensures the screw is free from hazardous substances for use in global markets.
Professional Applications & Engineering Value
This 4-40 UNC nylon plastic screw is engineered to address common challenges in electrical and industrial applications where metal fasteners are unsuitable. Its non-conductive properties prevent electrical interference, making it perfect for securing components in PCBs, electronic enclosures, and control panels. The rounded fillister head offers a low-profile, yet high-strength design that resists cam-out during installation with a standard screwdriver. The coarse thread and Class 2A fit ensure durable engagement in thermoplastic assemblies, reducing the risk of stripping. With a temperature resistance from -40° to 185°F, it maintains integrity in environments with thermal cycling, offering a lightweight, corrosion-proof alternative to metal screws.
Specification Summary & Compliance
This screw adheres to Unified National Coarse (UNC) thread standards with a Class 2A tolerance for consistent, reliable fit. The dimensional specifications include a 4-40 thread size, 0.112" thread diameter, and a 3/4" length. It is fully compliant with RoHS 3 (2015/863/EU), confirming it is manufactured without restricted hazardous substances, making it suitable for use in regulated electronic and industrial sectors.
