Which screw are you missing?
Three ways to get there, depending on what you have on hand. All our parts are sorted by diameter and length: once you know the size, ordering takes thirty seconds.
Diameter
in mm, on the threaded partLength
in mm, see below for where to measure fromThe most requested sizes: 6 × 12 mm, 6 × 30 mm, 6 × 16 mm, 6 × 50 mm, 5 × 12 mm. The same screw can be written 6x30, 6 × 30 mm or M6x30.
Measuring an identical screw
Length is the part that goes into the wood — the whole shaft, including the smooth part, not just the thread. What changes from case to case is whether the head counts or not.
Countersunk head (conical)
It sinks in flush with the surface. Measure head included, from the top of the head to the tip.
Flat, pan, or hex head
It stays on top of the wood. Measure under the head, down to the tip: the head doesn't count.
The diameter
Read it across the thread, from one crest to the other — never on the head. Almost all flat-pack furniture falls between 3 and 8 mm.
Round it right
A screw measured at 29.5 mm is a 30. Manufacturers use round values: 10, 12, 16, 20, 25, 30, 40, 50.
Recognising the drive
The drive doesn't change the size you order: it just confirms the screw you receive takes the same bit.
The measuring template
Two ways to use it: calibrate the screen once with a bank card and measure directly on it, or print the A4 sheet at 100%, without “fit to page”.
Hold a bank card against the screen and drag until the rectangle is exactly its size. The diameters and lengths below then become accurate on screen. The setting is remembered on this device.
Diameters — fit the thread into the hole
Lengths — align the tip to the left
Without calibration, the sizes shown are indicative; the sheet printed at 100% is always accurate.
To go further: screw search by size · the dimensions table · compatible screws from other brands · what to do when a screw is missing