3mm Pozi Countersunk Chipboard Screws A2 Stainless
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- Stainless grade A2 (304)
- Drive Pozi
- Head angle 90°
How to measure pozi countersunk chipboard screws
| Dimension | Symbol | Value |
|---|---|---|
| Thread diameter (nominal) | d | 3.0 mm |
| Head diameter | dk | 5.6 to 6.0 mm |
| Head height (max) | k | 1.9 mm |
| Pozi bit size | PZ | PZ1 |
| Lengths available (overall, including head) | L | 10, 12, 16, 20, 25, 30, 35, 40, 50 mm |
3mm pozi countersunk chipboard screws in A2 stainless steel. The head sits flush in a countersunk hole, the thread runs the full length, and the pozi recess takes a PZ1 bit. Dimensions follow the old DIN 7505 table for flat countersunk chipboard screws, which has since been withdrawn.
A2 stainless holds up in damp conditions as well as dry ones. There is no minimum order, so take as many or as few as the job needs, and the price per screw drops as the quantity goes up.
Where chipboard screws are used
Chipboard screws are made for particleboard, MDF and similar engineered boards, where a thread has to grip a soft, crumbly core. The thread runs the whole length, right up to the head, so the screw holds all the way along. They suit kitchen and bathroom cabinetry, MDF and particleboard furniture, and shop fitting, and the countersunk head gives the flush finish those jobs need.
The point is sharp and the thread cuts its own way in, so in most boards you can drive the screw without a pilot hole. Close to an edge or corner it is still worth pre-drilling, to avoid splitting.
Prefer a Torx drive? The 3mm Torx countersunk chipboard screws are the same size with a T10 recess.
Our No.4 pozi countersunk wood screws have a similar head and are partially threaded, which suits pulling two pieces of timber together.
Picking a chipboard screw size
3mm is the nominal thread diameter and is the closest metric equivalent of a No.4. Our range runs from 3mm (No.4) up to 6mm (No.14).
Length is measured overall, from the top of the head to the tip, because the whole screw ends up in the board. The 3mm comes in 9 lengths from 10mm to 50mm. Check the thickness of the board you are fixing into, and leave a little of the screw short of the far face.
The head is 5.6 to 6mm across and up to 1.9mm high, so a 90 degree countersink bit gives a flush fit.
Which stainless grade to choose
A2, also sold as 304 or 18/8, is the standard stainless for fixings. It suits most indoor work and general exterior use. A slight pull on a magnet is normal for A2.
For board fittings that stay damp or humid, such as in a bathroom, A4 is worth considering. To compare the two grades, read our A2 stainless steel and A4 stainless steel guides.
Chipboard screw questions
What size is a 3mm chipboard screw?
A 3mm chipboard screw is 3mm across the thread, which is equivalent to a No.4 gauge. The flat countersunk head is 5.6 to 6mm across and up to 1.9mm high, with a PZ1 pozi recess.
Do I need to drill a pilot hole for chipboard screws?
Usually not, because the sharp point and thread cut their own way into chipboard and MDF. Close to a board edge or corner it is worth drilling a small pilot hole first, as that lowers the risk of splitting. Longer screws are also easier to start straight with a pilot hole.
How long should a chipboard screw be?
Measure the thickness of what you are fixing and choose a length that goes well into the board without reaching the far face. The length here includes the head, so a 25mm screw is 25mm from the flat top of the head to the tip.
How do you measure a 3mm chipboard screw?
Place a caliper across the outside of the thread. A new 3mm screw reads 3mm or a little under, because 3mm is the nominal size. For length, measure from the top of the head to the tip.