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You’re mounting a PCB, securing a battery compartment, or assembling a marine electrical panel – and metal screws could cause shorts or corrode. These white nylon countersunk screws are made from PA66 (Nylon 66), a tough engineering plastic that’s completely non‑conductive, non‑magnetic, and immune to rust. The flat, countersunk head sits flush with the surface after pre‑drilling a matching 90° countersink, giving you a clean, professional finish. Phillips drive works with standard crosshead screwdrivers. Available in M2, M2.5, M3, M4, M5, M6, and M8 diameters – with overall length measured including the head. Perfect for electronics, battery boxes, chemical equipment, boat fittings, and any application where insulation or corrosion resistance is critical. The white color blends nicely with light‑colored plastics and enclosures.
| Thread Diameter | Overall Length (mm, including head) * | Thread Pitch (mm) | Head Style | Drive | Material |
|---|---|---|---|---|---|
| 📐 Length = from top of head to tip (total screw length). Fully threaded. Select exact length from dropdown. | |||||
| M2 | 4, 5, 6, 8, 10, 12, 16, 20 | 0.4 |
Countersunk / Flat |
Phillips |
White Nylon (PA66) |
| M2.5 | 4, 5, 6, 8, 10, 12, 16, 20, 25 | 0.45 | |||
| M3 | 4, 5, 6, 8, 10, 12, 16, 20, 25, 30 | 0.5 | |||
| M4 | 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40 | 0.7 | |||
| M5 | 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | 0.8 | |||
| M6 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | 1.0 | |||
| M8 | 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | 1.25 | |||
* Overall length includes the head. All screws are fully threaded. Values are manually measured – please allow minor errors. For exact parameters, refer to the size diagram in product images.
| Property | Value / Benefit |
|---|---|
| Material | PA66 (Nylon 66) – high strength, good toughness, wear resistant |
| Electrical insulation | Excellent – non‑conductive, safe for electronics |
| Corrosion resistance | Immune to rust, saltwater, chemicals, and UV (with stabilizers) |
| Temperature range | -40°C to +85°C continuous; short peaks up to 120°C |
| Density | ~1.14 g/cm³ (about 1/5 weight of steel) |
| Magnetic | Non‑magnetic – ideal for sensitive equipment |
1. How do I measure the length of these countersunk screws?
For countersunk screws, the length is measured overall – from the very top of the head to the tip. So an “M3 x 10mm” screw has a total length of 10mm including the head. This is standard for flat head screws. If you need a screw with a 10mm threaded portion under the head, you would choose a longer overall length (e.g., M3 x 12mm overall gives about 10mm under head).
2. Do I need to countersink the hole for these screws to sit flush?
Yes – these are true countersunk screws. To achieve a flush or slightly recessed finish, you must drill a matching 90° countersink hole. Use a countersink bit slightly larger than the screw head. In soft plastic or wood, you can sometimes tap the head in gently, but proper countersinking gives a professional result.
3. Are these nylon screws strong enough for structural applications?
Nylon screws have about 1/5 to 1/3 the tensile strength of steel. They’re perfect for lightweight assemblies, electrical insulation, corrosion‑prone environments, and vibration‑damping. For heavy load‑bearing (e.g., holding a 50kg shelf), use metal. For PCB mounting, plastic enclosures, boat hatches, or battery terminals, nylon is ideal.
4. Can I use these screws outdoors in direct sunlight? Will the white color yellow?
Nylon is UV‑sensitive. For continuous outdoor sunlight exposure (months or years), the material may become brittle and discolor (yellowing). We recommend using them in shaded or indoor applications, or painting the screw heads with UV‑blocking paint for outdoor use. For marine or outdoor use where UV is a concern, consider black nylon (which has added UV stabilizers).
5. Can I use a power drill to drive these screws?
Yes – but use a very low‑clutch setting (1–2) and low speed. Nylon threads can strip if over‑torqued. Hand tightening is recommended for final seating. The Phillips drive will slip before the screw breaks, but caution is advised.
6. What’s the difference between PA66 and other nylons? Why choose white?
PA66 (Nylon 66) has higher mechanical strength, better stiffness, and higher melting point than PA6. It’s the standard choice for engineering fasteners. White nylon is often used in medical devices, consumer electronics, and food equipment where a clean, neutral appearance is desired. It’s also easy to dye or paint if needed.
