🔩 Product Overview: Slotted Countersunk Machine Screws – A2 Stainless Steel (M1.2 to M6)
If you're restoring vintage electronics, working on antique instruments, or simply prefer the simplicity of a traditional slotted drive, these A2 stainless steel countersunk machine screws are exactly what you need. The 90° flat head sinks flush into countersunk holes for a smooth, professional finish – perfect for panel mounting, woodworking, and equipment assembly. The single slot (flathead) drive gives you precise manual control without cam‑out. Made from A2 (304) stainless steel, they resist rust and corrosion, making them suitable for both indoor and outdoor use. Available in metric sizes M1.2, M1.6, M2, M4, M5, and M6, with a variety of lengths (from 3mm to 25mm). Fully threaded with standard coarse pitch. Select your size and quantity – ideal for repairs and custom projects.
✨ Why Choose A2 Stainless Slotted Countersunk Screws
-
Slotted (flathead) drive – Classic single‑slot design allows for precise manual tightening with a standard flathead screwdriver. No special bits required.
-
Countersunk flat head (90°) – Sits flush in tapered holes for a clean, snag‑free surface. Ideal for panel mounting and visible assemblies.
-
A2 stainless steel (304 grade) – Excellent corrosion resistance for indoor and outdoor use. Won't rust – perfect for marine, kitchen, and industrial environments.
-
Wide size range: M1.2, M1.6, M2, M4, M5, M6 – From micro screws for electronics (M1.2) up to medium‑duty M6 for machinery and furniture.
-
Multiple length options available – See table below for specific size/length combinations. Fully threaded for maximum grip.
-
Fully threaded, coarse metric pitch – Standard threads per size. Threads run the entire length for reliable engagement with nuts or tapped holes.
-
Wide application range – Electronics, appliances, furniture, marine hardware, automotive trim, and general DIY.
📏 Available Sizes – Slotted Countersunk Screws (A2 Stainless)
| Thread Size |
Length (mm) |
Thread Pitch (mm) |
| M1.2 |
3 |
0.25 |
| 4 |
| M1.6 |
3 |
0.35 |
| M2 |
3 |
0.4 |
| 4 |
| 8 |
| M4 |
16 |
0.7 |
| M5 |
16 |
0.8 |
| 25 |
| M6 |
20 |
1.0 |
| 25 |
Note: Length is measured as total screw length including head (standard for countersunk screws). All screws are fully threaded. A2 stainless steel provides good corrosion resistance.
| Specification |
Details |
| Product Type |
Slotted Countersunk Flat Head Machine Screws |
| Material |
A2 Stainless Steel (304 / 18-8) |
| Drive Style |
Slotted (flathead / single slot) |
| Head Style |
Countersunk (90°) |
| System of Measurement |
Metric |
| Thread Type |
Coarse, fully threaded |
| Length Measurement |
Length includes head (total screw length) |
❓ FAQs – Slotted Countersunk Stainless Screws
🔸 What screwdriver should I use for these slotted screws?
Use a standard flathead (slotted) screwdriver that matches the slot width. For M1.2–M2, a 1.5–2mm blade works. For M4–M6, a 3–4mm blade is ideal. Avoid using a driver that is too wide or too narrow – it will damage the slot.
🔸 How is length measured for countersunk screws?
For countersunk screws, length is measured as total screw length including the head – from the top of the flat head to the tip. For example, an M4 x 16mm screw is 16mm long overall. This matches standard fastener measurement.
🔸 Are these screws fully threaded? What pitches do they have?
Yes – all screws are fully threaded. Pitches: M1.2x0.25, M1.6x0.35, M2x0.4, M4x0.7, M5x0.8, M6x1.0 (standard metric coarse).
🔸 Will A2 stainless steel rust in outdoor or coastal environments?
A2 (304) stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, A4 (316) stainless is better, but for general outdoor furniture, appliances, and marine above‑waterline use, 304 lasts for years without rust.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are standard machine screws – they require a matching metric nut (M1.2–M6) or a pre‑tapped hole. They are not self‑tapping. For best corrosion resistance, pair them with A2 stainless nuts.
🔸 Do you offer other lengths not listed in the table?
We offer the specific size/length combinations shown in the table. If you need a different length or size not listed, please contact us – we may be able to source it or recommend an alternative.
