M3 White Nylon Countersunk Screws — Flush-Fit Plastic Fasteners for Electronics & Precision Assembly When a metal screw would corrode, conduct electricity, or add unnecessary weight, builders and makers reach for nylon. Whether you're assembling a PCB enclosure, mounting circuit boards, building RC components, or securing lightweight panels, finding the right M3 nylon Phillips countersunk screw in the exact length you need shouldn't be a scavenger hunt. These M3 white nylon Phillips flat head machine screws are made from engineering-grade nylon (PA66) and feature a countersunk head profile that sits flush with — or below — the surface of your material. Available in lengths from 6mm (≈1/4") to 20mm (≈25/32"), with pack quantities from 1 to 100 pieces, so you can grab exactly what your project calls for. Thread diameter is M3 (3mm) with a standard 0.5mm pitch. Typical use cases include PCB and electronics enclosure assembly where electrical isolation is required, lightweight panel fastening in RC vehicles and hobby builds, and plastic-to-plastic or plastic-to-aluminum joining in 3D-printed parts and DIY enclosures — all scenarios where a flush, non-metallic fastener for plastic panels makes a real difference. 🔩 Compatibility: M3 ISO metric thread (0.5mm pitch) — fits standard M3 nuts, threaded inserts, and M3-tapped holes. Drive: Phillips PH1. Head angle: 90° countersunk (flat head). ✅ Key Features of These M3 Nylon Phillips Countersunk Screws ⚡Electrically Non-Conductive — Made from PA66 nylon, these screws provide full electrical isolation, making them a go-to choice for PCB mounting screws and electronics enclosure assembly. 💧Corrosion-Resistant Material — Nylon does not rust or oxidize, so these fasteners hold up in damp environments and humid conditions where metal screws would degrade over time. 🎯Flush Countersunk Head — The 90° flat head countersunk profile allows the screw to sit flush with or below the surface, delivering a clean finish on plastic panels, enclosures, and 3D-printed parts. ⚖️Lightweight Construction — Nylon weighs significantly less than steel, making these screws ideal for weight-sensitive builds like RC vehicles, drones, and portable electronics. 🔧Phillips PH1 Drive — Standard cross-head drive works with common screwdrivers and power bits, reducing the need for specialty tools during assembly. 📦Flexible Pack Quantities — Choose from 1 to 100 pieces per order, so you can match your exact project needs without overstocking — from a single prototype to a full production run of nylon machine bolts. 📐 Technical Specifications — M3 Nylon Countersunk Machine Screws Thread Standard ISO Metric M3 × 0.5mm pitch Thread Diameter M3 (3mm / ≈0.118") Available Lengths (incl. head) 6mm (≈1/4"), 8mm (≈5/16"), 10mm (≈3/8"), 12mm (≈15/32"), 15mm (≈19/32"), 18mm (≈45/64"), 20mm (≈25/32") Head Type Countersunk (Flat Head), 90° angle Drive Type Phillips (Cross) — PH1 Material PA66 Nylon (engineering-grade polyamide) Color White Electrical Insulation Yes — non-conductive Corrosion Resistance Yes — does not rust Pack Quantity Options 1, 5, 10, 20, 50, 100 pcs Compatible Nut / Insert Standard M3 metric nut or M3 threaded insert Recommended Driver Bit PH1 Phillips Temperature Range See variant options — contact us to confirm for extreme environments ⚠️ Note: Length measurement includes the head. Always verify your countersink hole angle (90°) before installation for a proper flush fit. ❓ Frequently Asked Questions How do I choose the right screw length for my project? A general rule is to choose a length that allows the screw to penetrate the base material by at least 2–3 times the thread diameter. For M3 screws, that typically means at least 6–9mm of thread engagement in the base material. For example, if you're fastening a 4mm panel, a 10mm (≈3/8") screw generally provides solid grip. Note that length is measured including the head on countersunk screws — factor in your material thickness accordingly. How strong are nylon screws compared to metal screws? Nylon screws are generally lighter and more flexible than metal fasteners, making them well-suited for low-torque, non-structural applications. They typically handle tensile loads appropriate for light electronics assembly, PCB mounting, and enclosure work. For heavy structural loads or high-vibration environments, metal fasteners are generally recommended. Do not overtighten — nylon threads can strip more easily than metal under excessive torque. Are these screws suitable for outdoor or wet environments? Nylon is inherently corrosion-resistant and does not rust, making these screws generally suitable for damp or mildly wet environments. However, prolonged UV exposure can cause nylon to become brittle over time. For long-term outdoor use, consider protecting the fasteners from direct sunlight, or contact us to confirm suitability for your specific application. What thread standard do these M3 screws follow, and are they compatible with standard M3 nuts? These screws follow the ISO metric thread standard at M3 × 0.5mm pitch, which is the most common M3 thread pitch used worldwide. They are compatible with standard M3 metric nuts, M3 threaded brass inserts, and any M3-tapped hole machined to ISO standard. They are not compatible with UNC/UNF inch-standard threads. What driver bit do I need, and how do I avoid stripping the head? These screws use a Phillips (cross) drive. A PH1 (Phillips #1) screwdriver or bit is typically the correct size for M3 Phillips screws. Using the correct bit size and applying steady downward pressure while turning helps prevent cam-out and protects the nylon head from stripping. Avoid power drivers set to high torque — hand-tightening or a low-torque setting is generally recommended for nylon fasteners. Will the countersunk head sit flush with my material? Yes — the countersunk (flat) head is designed to sit flush with or below the surface when installed in a properly countersunk hole. The head angle is 90°, which is the standard for metric countersunk screws. Pre-drilling a countersink with a 90° countersink bit is recommended for a clean flush finish. Without a countersink, the head will protrude above the surface. Are nylon screws electrically insulating — can I use them in electronics builds? Yes. Nylon (PA66) is a non-conductive material, making these M3 nylon Phillips countersunk screws a common choice for electronics assembly, PCB mounting, and any application where electrical isolation between components is needed. They will not create short circuits or interfere with grounding paths the way metal screws can. 🛒 Select your screw length and pack quantity above, then add to cart — ships from our US warehouse.
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