---
title: "Which screw should I use in chipboard?"
description: "A twin-thread chipboard screw with an unthreaded shank under the head, so it pulls the joint together instead of bursting the board. The ranked options, the techniqu"
url: https://atoneplace.net/which/screw-chipboard/
site: "At One Place"
---

# Which screw should I use in chipboard?

**Which screw should I use in chipboard?: A twin-thread chipboard screw with an unthreaded shank under the head, so it pulls the joint together instead of bursting the board.**

Chipboard is chips of wood in resin, so it is strong in compression across the face and weak everywhere else, particularly at an edge where a screw is trying to expand a hole in a material that cannot stretch. The twin thread exists because it removes material as it drives rather than compressing it outwards, and the unthreaded shank under the head exists for a different reason worth knowing generally: if a screw threads into the top piece as well as the bottom one, it jacks the two apart instead of clamping them together. That is why a clearance hole in the top piece makes almost any screwed joint tighter, in board or in timber. Moisture is chipboard's other weakness — a wetted board swells irreversibly and loses all screw holding.

## The options, ranked

*Ranked best-first for the stated job. The third column is why the others exist.*

| Option | Good at | Bad at |
| --- | --- | --- |
| Twin-thread chipboard screw | Drives fast, grips crushed particle board well, and the coarse thread bites into a weak core. | Still splits an edge without a pilot hole. |
| Screw with an unthreaded shank | The plain shank lets the top piece slide so the head clamps the joint tight. | Fully threaded screws are far more common on the shelf and hold the joint apart. |
| Confirmat screw | The flat-bottomed furniture screw used in flat-pack assembly; huge holding power in board edges. | Needs a stepped drill bit and precise hole placement. |
| Cam and dowel fittings | Designed for board edges, demountable, and the reason flat-pack furniture can be assembled at all. | Needs factory-accurate drilling. |

## Technique that changes the outcome

1. Pilot-drill edges, and use a clearance hole in the top piece
2. Keep fixings 30 mm or more from the end of a board
3. Do not overtighten; the head buries itself and the fixing is finished
4. For a joint that will be taken apart, use knock-down fittings rather than screws

## What goes wrong

- Fully threaded screws where you need the joint pulled together
- Re-using a stripped hole without a plug or a larger fixing
- Any exposure to water, which swells the board permanently

> Compiled practical guidance rather than a published standard. Product formulations vary by brand and market, so read the label — and where the work is structural, electrical or gas, the regulations that apply where you are govern rather than anything here.

## Other screw questions

| For | Use |
| --- | --- |
| Wood | A pilot hole matching the screw's core diameter in the lower piece and a clearance hole in the upper one — that is what makes a joint tight. |
| Decking | Stainless steel — 304 inland, 316 near the coast — or a screw specifically rated for modern treated timber, which eats ordinary zinc plating. |
| Masonry | A concrete screw into a precisely sized hole, or a plug and screw — and hollow block needs a different anchor entirely. |
| Plasterboard | Coarse-thread bugle-head drywall screws into timber studs, fine-thread into metal studs — and never use them for anything structural. |
| MDF | A straight-shank MDF screw with a parallel thread, always into a pilot hole — the edge splits without one. |
| Sheet metal | A self-drilling (Tek) screw with a drill point matched to the material thickness, or a self-tapping screw into a correctly sized pilot hole. |
| Plastic | A thread-forming screw designed for plastic, or a heat-set threaded insert where the joint will be undone more than once. |
| Roofing sheets | A hex-head screw with a bonded EPDM washer, driven until the washer just spreads — no further. |
| Brass hardware | Cut the thread with a steel screw of the same size first, wax the brass one, and use a driver that fits the slot exactly. |

## Common questions

### Which screw should I use in chipboard?

A twin-thread chipboard screw with an unthreaded shank under the head, so it pulls the joint together instead of bursting the board.

### What should I avoid?

Fully threaded screws where you need the joint pulled together Re-using a stripped hole without a plug or a larger fixing Any exposure to water, which swells the board permanently

## Related pages

- [Which screw and pilot hole should I use for wood?](https://atoneplace.net/which/screw-wood/)
- [Which screw should I use for decking?](https://atoneplace.net/which/screw-decking/)
- [Which screw should I use in masonry?](https://atoneplace.net/which/screw-masonry/)
- [Which screw should I use for plasterboard?](https://atoneplace.net/which/screw-plasterboard/)
- [Which screw should I use in MDF?](https://atoneplace.net/which/screw-mdf/)
- [Which screw should I use for sheet metal?](https://atoneplace.net/which/screw-sheet-metal/)
- [Which screw should I use in plastic?](https://atoneplace.net/which/screw-plastic/)
- [Which screw should I use for roofing sheets?](https://atoneplace.net/which/screw-roofing/)
- [How do I drive brass screws without snapping them?](https://atoneplace.net/which/screw-brass-hardware/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)