White Plastic Phillips Countersunk Machine Screws — Flush-Fit Fastening from M2.5 to M8
When metal screws are too heavy, too conductive, or simply prone to rust in your application, finding a reliable plastic alternative in the right size can be surprisingly frustrating. Whether you're assembling electronics enclosures, securing panels in humid environments, or building lightweight fixtures, these white plastic Phillips flat head countersunk machine screws give hobbyists, makers, and small-batch manufacturers a clean, corrosion-free fastening solution across a wide size range.
Each order contains your chosen quantity (10, 20, 50, 100, or 500 pieces) of a single size combination. Thread diameters span M2.5, M3, M4, M5, M6, and M8, with lengths available from 5mm (≈3/16") up to 40mm (≈1-9/16"). The flat countersunk head profile allows the screw to sit flush with — or recessed into — the mating surface when installed in a properly countersunk hole. Material is white-colored engineering plastic (typically nylon or polypropylene), offering a lightweight, non-conductive, and non-corroding alternative to stainless or zinc-plated steel fasteners.
Typical use cases include electronics panel assembly and PCB enclosures where non-conductive fasteners for circuit board housings are required, outdoor or poolside equipment panels where corrosion-resistant plastic screws for wet environments prevent rust staining, and lightweight cabinetry or display fixtures where flush-mount white plastic machine screws keep surfaces smooth and snag-free.
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Compatibility: ISO metric thread standard — M2.5, M3, M4, M5, M6, M8. Compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. Confirm thread pitch with your mating hardware for tight-tolerance assemblies.
✅ Key Features of These White Plastic Phillips Countersunk Machine Screws
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🚫🦀Corrosion-Resistant Material — Made from engineering-grade white plastic (typically nylon or polypropylene), these screws will not rust, stain, or corrode — ideal for humid, wet, or mildly chemical environments where metal fasteners fail over time.
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⚡Non-Conductive & Non-Magnetic — Plastic construction makes these screws safe for electronics enclosures, PCB assemblies, and sensitive equipment where metal fasteners could cause shorts, interference, or magnetic distortion.
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📐Flush Countersunk Head Profile — The flat head is designed to sit flush with or below the surface in a countersunk hole, delivering a smooth, snag-free finish on panels, covers, and cabinetry — no protruding heads to catch on wiring or clothing.
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🔧Phillips Drive for Reliable Installation — Standard Phillips (cross) recess works with common hand drivers and power tools. The drive geometry provides good torque transfer for plastic fasteners without requiring specialty bits.
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📦Flexible Pack Sizes — 10 to 500 Pieces — Whether you need a small sample pack for prototyping or a bulk quantity for production runs, pack sizes of 10, 20, 50, 100, and 500 pieces let you order exactly what your project requires.
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📏Wide Size Range — M2.5 Through M8, 5mm to 40mm — Six thread diameters and up to thirteen length options per diameter mean you can source the right white plastic countersunk screw for fine electronics work up to medium-duty panel fastening from a single listing.
📐 Technical Specifications — White Plastic Phillips Flat Head Machine Screws
| Product Type |
Phillips Flat Head (Countersunk) Machine Screw |
| Material |
White engineering plastic (typically nylon or polypropylene) |
| Drive Type |
Phillips (cross recess) |
| Head Style |
Flat / Countersunk (flush-mount) |
| Thread Standard |
ISO Metric |
| Available Thread Diameters |
M2.5, M3, M4, M5, M6, M8 |
| Available Lengths |
5mm (≈3/16") — 40mm (≈1-9/16"); see variant options for per-diameter availability |
| Thread Pitch |
See variant options / Contact us to confirm |
| Color |
White |
| Packing Quantities |
10, 20, 50, 100, 500 pieces per order |
| Corrosion Resistance |
Inherent (non-metallic) |
| Electrical Conductivity |
Non-conductive |
| Recommended Use |
Light-duty panel assembly, electronics enclosures, outdoor fixtures, cabinetry |
| Country of Origin |
See variant options |
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Note: Plastic screws are designed for light-to-medium duty applications. They are not suitable for high-torque structural connections. If you are unsure whether this fastener meets your load requirements, please contact us before ordering.
❓ Frequently Asked Questions
How do I choose the right length for my project?
A general rule: the screw length should be roughly 2–3 times the thickness of the material being fastened. For example, joining two 5mm (≈3/16") panels typically calls for a 10–12mm screw. Always measure the combined thickness of all layers and leave at least 3–4 thread pitches engaged in the base material. When in doubt, size up — a slightly longer screw is generally safer than one that bottoms out before clamping.
What load or clamping force can these plastic screws handle?
Plastic screws are generally suited for light-duty fastening — typically panel assembly, electronics enclosures, and non-structural fixtures. They are not recommended for high-torque or heavy structural loads. Tensile and shear strength will vary by diameter and material grade. Contact us to confirm suitability for your specific application if load requirements are critical.
Are these screws suitable for outdoor or wet environments?
Yes. White plastic (typically nylon or polypropylene) is inherently corrosion-resistant and will not rust, making these screws well-suited for humid, wet, or mildly chemical environments such as pool equipment panels, marine electronics enclosures, and outdoor signage fixtures. They will not leave rust stains on white or light-colored surfaces.
What thread standard do these screws follow — are they compatible with standard metric hardware?
These screws follow the ISO metric thread standard (M2.5, M3, M4, M5, M6, M8). They are generally compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. If your assembly requires tight thread-pitch tolerances, contact us to confirm the specific pitch for your chosen diameter before ordering.
Why choose a flat countersunk head instead of a pan head or button head?
A flat countersunk head sits flush with or below the surface of the material when installed in a properly countersunk hole. This is ideal when a smooth, snag-free surface is needed — common in electronics panels, cabinetry, and any application where protruding heads would interfere with fit, aesthetics, or safety. Pan heads and button heads sit above the surface and are better suited when countersinking is not practical.
Can I use these screws in electronics or PCB assemblies?
Yes. Plastic screws are non-conductive and non-magnetic, making them a popular choice for PCB standoffs, enclosure assembly, and other electronics applications where metal fasteners could cause shorts, ground loops, or electromagnetic interference. They are widely used in control panels, sensor housings, and consumer electronics enclosures.
What Phillips driver bit size should I use?
Use the correct Phillips bit size for the screw diameter — generally PH0 for M2.5–M3, PH1 for M3–M5, and PH2 for M5–M8. Using an oversized or undersized bit can strip the plastic head. Apply steady, moderate pressure and avoid high-speed power driving, which can generate heat and damage the plastic recess.
🛒 Select your thread diameter, length, and pack quantity above, then add to cart — ships from our US warehouse.
