🔧 M4–M8 Thin Flat Head Phillips Machine Screws – A2 Stainless Steel, Ultra‑Low Profile (4–50mm Lengths)
You’re installing a slim panel, assembling a compact electronic enclosure, or working on a project where every millimetre of head height matters. These M4, M5, M6 and M8 thin flat head screws have an extremely low profile – the head sits almost flush with the surface, giving you a clean, near‑invisible finish without requiring a full countersink. Made from A2 stainless steel (304), they resist rust and corrosion indoors and out. The Phillips drive works with standard crosshead screwdrivers. Fully threaded, with length measured under the head. Perfect for tight‑clearance applications like machinery covers, automotive trim, and marine equipment where a bulky screw head would get in the way.
✨ Key Features – Thin Flat Head Phillips Screws (A2 Stainless)
- 📏 Ultra‑low profile head – Head height is just 1.2–1.4mm (M4–M6). Ideal for tight spaces where a standard pan or cap head won’t fit.
- 🔽 Thin flat head design – Wide, flat bearing surface spreads load without protruding. No countersinking required.
- 🛡️ A2 stainless steel (304) – Excellent corrosion resistance, oxidation resistance, and durability. Won’t rust in humid or outdoor environments.
- 📐
Phillips drive – Standard cross recess for easy installation with common screwdrivers.
- 📏 Metric sizes M4, M5, M6, M8 – Popular diameters for light to medium duty fastening in machinery, furniture, and marine gear.
- 📐 Lengths from 4mm to 50mm (under head) – Example: M5 x 10mm means thread diameter 5mm, length from under head to tip is 10mm. Fully threaded.
- 🔧 Versatile use – Machinery covers, electronic enclosures, automotive interior trim, marine panels, and DIY projects with limited headroom.
📏 Dimensional Specifications – M4 to M8 Thin Flat Head Screws
| Thread Diameter (M) |
Thread Pitch (mm) |
Head Diameter (mm) – approx. |
Head Height (k) – mm |
Typical Lengths (mm, under head) * |
Material |
| 📐 Length measured from underside of head to tip. Fully threaded. Select exact size from dropdown. |
| M4 |
0.7 |
7–8 |
1.2 |
4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50
(exact availability varies) |
A2 304 Stainless Steel |
| M5 |
0.8 |
10 |
1.3 |
| M6 |
1.0 |
12 |
1.4 |
| M8 |
1.25 |
— |
— |
* Lengths are typical – exact availability may vary. Head dimensions are for guidance only. Please allow minor manual measurement errors. Images are for representation purposes only; actual product may vary slightly.
📋 Why Thin Flat Head Screws?
| Benefit |
Description |
| Space‑saving head |
Head height is just 1.2–1.4mm for M4–M6 – perfect for tight enclosures, sliding mechanisms, and flush assemblies. |
| No countersink needed |
Unlike traditional flat head screws, this design sits on the surface but with extremely low profile. Drill a straight hole – no countersink required. |
| Corrosion resistant |
A2 stainless steel ensures long life in outdoor, coastal, and humid environments. |
| Fully threaded |
Maximum thread engagement for secure fastening in blind holes or with nuts. |
❓ Frequently Asked Questions – Thin Flat Head Phillips Screws
1. How do I measure the length of a thin flat head screw?
Length is measured from the underside of the head to the tip. The head itself is NOT included. So an “M5 x 10mm” screw has a 10mm long threaded shaft under the head. This matches our listing.
2. Do I need to countersink the hole for these screws to sit flush?
No – this is not a standard countersunk screw. The thin flat head is designed to sit on the surface with a very low profile. For a perfectly flush fit, you can lightly countersink, but it’s not required. A straight clearance hole works fine.
3. Are these screws fully threaded? What about longer lengths?
Yes – all M4 to M8 screws in this range (up to 50mm) are fully threaded from under the head to the tip, giving you maximum grip.
4. Can I use these screws outdoors? Will they rust?
A2 stainless steel (304) is highly corrosion‑resistant and suitable for outdoor use, including rain, humidity, and coastal areas. For continuous saltwater immersion, choose A4 (316) stainless, but for most outdoor applications, A2 is excellent and will not rust.
5. What Phillips screwdriver size do I need for M4–M8?
M4: #1 Phillips, M5–M6: #2 Phillips, M8: #2 or #3. Always use a driver that fits snugly to avoid cam‑out and head damage.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use standard metric nuts of the same thread size (e.g., M5 nut for M5 screw). For outdoor use, pair with stainless steel nuts.
