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You’re restoring an antique radio, building a wooden boat, or installing decorative hardware on a piece of furniture – and ordinary steel screws would look out of place or rust over time. These M5 and M6 brass countersunk screws combine classic elegance with practical performance. The flat, countersunk head sinks flush into a pre‑drilled hole, leaving a smooth surface that won’t snag. The Phillips drive gives you reliable engagement with standard crosshead screwdrivers – no special bits needed. Made from solid brass, they resist corrosion, offer good electrical conductivity, and develop a beautiful natural patina over time. Lengths are measured overall (including the head). Perfect for marine fittings, furniture restoration, musical instrument repair, and any project where both form and function matter.
| Thread Diameter | Overall Length (mm) * | Thread Pitch (mm) | Head Style | Drive | Material |
|---|---|---|---|---|---|
| 📐 Overall length = from top of head to tip (total screw length). Select exact length from dropdown. | |||||
| M5 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | 0.8 |
Countersunk / Flat |
Phillips |
Solid Brass |
| M6 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60 | 1.0 | |||
* Overall length includes the head. Most screws up to ~30mm are fully threaded; longer screws may have a partial thread (unthreaded shank near the head). Please allow minor manual measurement errors (±0.5mm).
| Property | Benefit |
|---|---|
| Corrosion resistance | Excellent in freshwater, marine, and humid environments – forms protective patina. No red rust. |
| Conductivity | Good electrical and thermal conductivity – ideal for grounding or electrical terminals. |
| Non‑magnetic | Safe for sensitive electronics, MRI rooms, and compass housings. |
| Aesthetic | Warm golden color that matches wood, leather, and vintage hardware. Can be polished or left to age. |
| Strength | Lower than steel, but sufficient for furniture, decorative, and light‑duty structural applications. |
1. How do I measure the length of these countersunk screws?
For countersunk screws (flat head), the length is measured overall – from the very top of the head to the tip. So an “M5 x 8mm” screw has a total length of 8mm including the head. This is standard for countersunk fasteners. If you need a screw with a 8mm threaded portion under the head, you would choose a longer overall length (e.g., M5 x 10mm overall gives about 8‑9mm under head depending on head height).
2. Do I need to countersink the hole for these screws to sit flush?
Yes – these are true countersunk screws with a 90° cone head. To achieve a flush or slightly recessed finish, you must drill a matching 90° countersink hole. Use a countersink bit of the appropriate size. In soft wood, you can sometimes tap the head in with a hammer, but proper countersinking gives a professional result and prevents splitting.
3. Will brass screws rust or tarnish? Can I use them in saltwater?
Brass does not rust (it contains no iron). It does develop a natural patina – first darkening, then sometimes turning greenish (verdigris) in saltwater or high‑humidity environments. This patina is protective and actually stops further corrosion. For marine use, brass is suitable for above‑water fittings and interior boat hardware. For continuous underwater immersion, use bronze or 316 stainless. For most furniture, outdoor decorations, and coastal environments, brass works beautifully.
4. Are these screws strong enough for furniture assembly?
Yes – for light to medium duty furniture (chairs, tables, cabinets, hinges), brass screws are plenty strong. They are softer than steel, so avoid over‑torquing. For heavy structural loads (bed frames, large shelving units), use steel screws. For decorative hardware, drawer pulls, and antique restoration, brass is the perfect choice.
5. What’s the difference between Phillips and Pozi? Which drive is on these screws?
These screws have a standard Phillips cross recess. The term “Pozi” in the product title is used for search visibility, but the actual drive is Phillips. They will work with Pozidriv bits in an emergency, but for best results, use a genuine Phillips driver (PH1 for M5, PH2 for M6).
6. Can I use these screws with a nut or do they need a tapped hole?
Both – these are machine screws. They can be threaded into pre‑tapped holes of the same metric size (M5 or M6) or used with matching brass nuts. They are not self‑tapping. For wood, drill a pilot hole and use a threaded insert or a nut on the back for maximum holding strength.
