No.8 (4mm) Pozi Raised Head Countersunk Wood Screws DIN 7995 A2 Stainless
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- Standard DIN 7995
- Grade A2 (304)
- Drive Pozi
- Head angle 90°
How to measure DIN 7995 pozi raised head countersunk wood screws
Gauge to thread size
- No.43mm
- No.63.5mm
- No.84mm
- No.94.5mm
- No.105mm
| Dimension | Symbol | Value |
|---|---|---|
| Thread diameter (nominal) | d | 4.0 mm |
| Shank diameter | ds | 3.52 to 4.0 mm |
| Head diameter | dk | 7.5 mm |
| Countersunk head height (max, dome not included) | k | 2.2 mm |
| Dome height above the countersink (approx.) | f | 1.0 mm |
| Pozi bit size | PZ | PZ2 |
| Lengths available (point to top of countersink, dome not included) | L | 16, 20, 25, 30, 35, 40, 45, 50, 60, 70 mm |
No.8 (4mm) pozi raised head countersunk wood screws to DIN 7995, in A2 stainless steel. The countersunk underside beds into the wood, a low dome finishes just above the surface, and the pozi recess takes a PZ2 bit.
Being A2 stainless, they cope with outdoor work such as cladding and garden projects just as well as indoor joinery. There's no minimum order, so you can buy exactly the number you need, and the price per screw comes down as the quantity goes up.
Where pozi raised head screws are used
Pozi raised head screws suit fixings that stay on show, where a domed head looks tidier than a flat one. They're a common choice for door and window furniture, hinges and cabinet hardware. A power driver tends to slip out of a slot, but the pozi recess holds the bit well, so these drive cleanly with a drill driver.
They're often fitted with a cup washer, which the countersunk underside sits into. We stock No.8 A2 stainless cup washers to go with them.
If you'd rather the head finished flush, our No.8 pozi countersunk wood screws have the same underside without the dome.
They're part threaded, with a plain shank below the head. Put a clearance hole through the top board and the thread bites only in the lower one, drawing the two together.
The underside of the head is a 90° cone and fits a standard 90° countersink bit, leaving just the dome above the surface.
Finding the right size
The higher the gauge, the thicker the screw. A No.8 has a 4mm thread, and sits between the No.6 (3.5mm) and the No.9 (4.5mm).
On a raised head screw, length runs from the point up to the rim of the countersunk part, level with the surface. The dome sits above the wood, so it isn't included. There are 10 No.8 lengths, from 16mm to 70mm.
The thread's nominal size is 4mm, so a caliper on a new No.8 shows 4mm or just below. Under the head, the plain shank is allowed to be thinner, as small as 3.52mm. Both measurements are listed in the dimensions table.
Stainless grade
A2 is the common stainless for fixings, in the same family as 304 and 18/8. It's the usual choice for outdoor timber because it stands up to rain and damp. It's close to non-magnetic, and a slight pull on a magnet is nothing to worry about.
Near the sea or a swimming pool, salt is harder on stainless, and A4 is the better pick. Our A2 stainless steel and A4 stainless steel guides explain why.
Questions about these screws
What size is a No.8 screw in mm?
A No.8 measures 4mm across the thread. These are made to DIN 7995, which also sets the head: 7.5mm across, 2.2mm at most from the underside to the rim, a dome of about 1mm on top, and a PZ2 pozi recess.
The No.8 name is borrowed from imperial sizing. These screws are metric, and the 4mm thread is the nearest metric size to an imperial No.8, at roughly 4.2mm.
Which bit fits a No.8 pozi raised head screw?
You need a PZ2 pozi bit. A pozi head looks like a Phillips head, but it has four small tick marks between the arms of the cross, and the bit has ribs that line up with them.
A Phillips bit will turn it, but it doesn't seat fully and tends to slip out as the screw tightens, which can damage the head. Matched to the right bit, the pozi recess takes more turning force before the bit slips.
If you'd rather use a flat-blade screwdriver, our No.8 slotted raised head countersunk wood screws have the same head with a slot.
What is a No.8 x 1 inch screw in mm?
That's 4 x 25mm in metric. Inches are still common for wood screws, so you'll see both on every length, for example 3/4in (20mm), 1in (25mm) and 2in (50mm). The length itself is metric and the inch figure is the closest equivalent, so a 1in screw here is 25mm rather than 25.4mm.
How do you measure a No.8 pozi raised head screw?
A caliper across the outside of the thread gives the size. On a new No.8, expect 4mm or a fraction under, because 4mm is the nominal size. The plain shank under the head is a separate figure, and DIN 7995 allows it to be as thin as 3.52mm.
Measure the length from the tip to the rim of the countersunk part, where it meets the surface, and leave the dome out.