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How to use a sliding bevel

Updated: 22 October 2026

The corner where the skirting meets is rarely the 90° the offcut in your hand assumes. A sliding bevel copies that existing angle and locks it. This is how to use a sliding bevel: seat the stock, lock the blade, prove it with a finger, then mark. Peter F. based the sequence on DIY Doctor, Skirting 4 U and UK reviews in the [sliding bevel comparison](/hub/measuring-and-marking-tools/sliding-bevel), on 22 October 2026. A qualifying purchase can earn a commission at no extra cost to you. Stair pitch stays on [sliding bevel for stairs](/hub/measuring-and-marking-tools/sliding-bevel/sub/sliding-bevel-for-stairs). If the nut will not hold, the checks are on the [sliding bevel buying guide](/hub/measuring-and-marking-tools/sliding-bevel/sub/sliding-bevel-buying-guide).

The corner where the skirting meets is rarely the 90° the offcut in your hand assumes. A sliding bevel copies that existing angle and locks it.

Our top picks

Bahco Bahco 9574-300, 300 mm

Best overall

Bahco Bahco 9574-300, 300 mm
8.7/10about £35.94
View offer
PRESCH PRESCH sliding bevel, 19/27 cm

Rank 2

PRESCH PRESCH sliding bevel, 19/27 cm
9.1/10about £22.99
View offer
Hilka Hilka 9 inch adjustable bevel

Preis-Tipp

Hilka Hilka 9 inch adjustable bevel
8.4/10about £7.49
View offer
On this page
  1. 1.Copy the corner
  2. 2.Move it to the saw
  3. 3.Skirting that is not square
  4. 4.When to stop

Copy the corner

Loosen the nut, the knob, or the wing screw until the blade swings without force. Sit the stock flat on one face of the corner and the blade flat on the other. On skirting, that is the two walls. Tighten until the blade resists, then push the tip with a finger. DIY Doctor treats a wing nut that only closes the jaws, while the blade still creeps, as a stock that is not doing its job. If the angle changes under that push, stop. Find My Tool calls the bevel a template, and a plain T-bevel does not read out degrees. Fold a pointed blade back into the stock before the bag. DIY Doctor flags a bare tip because it cuts a hand, and none of these listings promises a sheath.

Move it to the saw

Carry the locked bevel to the mitre saw without leaning the blade on your leg. Lay the stock against the saw’s fence and swing the saw until the blade recess, or the saw plate, meets the bevel’s blade. DIY Doctor describes that fence method. Lock the saw, then look at the bevel again. If the blade has moved, reset from the corner, not from memory. Cut a scrap of the same board, about 300 mm, and offer it into the corner. The finished length comes after a second scrap agrees.
Bahco Bahco 9574-300, 300 mm

Testsieger

Bahco Bahco 9574-300, 300 mm
8.7/10about £35.94
View offer

Skirting that is not square

Two boards that meet in an internal corner each take half of the angle you copied, so the joint faces you instead of leaving a feather edge on one wall. Copy the whole corner first and lock it. A UK hallway can be 88 degrees or 93, so the saw setting is half of the corner you copied, not a fixed 22.5. Test two offcuts before you cut the long lengths. A centre nut can stop the stock sitting flat. If your hand cannot seat the tool, an end-lock bevel is a buying question.

When to stop

Stop if the blade creeps after you have tightened it twice. Return the tool. The Consumer Rights Act 2015, section 9, is the route for a new bevel that will not hold, through the retailer. Pick up a second bevel when two angles must stay recorded at once. Common Woodworking treats two locked bevels as a rule of thumb, because resetting the only one deletes the first corner. Call a joiner for a whole flight, a new balustrade, or a wall that is moving. If the joint really is 90°, the sliding bevel vs combination square page is the fork.

Common questions

How do I copy an angle I can touch?
Loosen the bevel, seat the stock on one face and the blade on the other, and tighten. Push the blade with a finger. If it stays, the angle is captured. Mark from the stock on the same face, with a pencil or a knife. If the blade moves under your finger, the copy is already wrong, and tightening harder only closes the jaws. DIY Doctor uses that creep test as the sign of a weak stock.
How do I put that angle on a mitre saw?
Lay the stock on the mitre-saw fence and swing the saw until the blade meets the bevel. Lock the saw, then check the bevel has not slipped on the way from the corner. Cut a scrap of the same material and offer it up. A gap means you reset from the wall, not from the first scrap. Read any degree number from the saw once the scrap fits. The bevel’s job was to hold the shape.
Why do two skirting boards each need half the corner?
Each board takes half the internal angle so the joint meets in the middle of the corner. Copy the whole corner with the bevel, transfer it to an offcut, and set the saw to half of that angle. Skirting 4 U’s worked example is 67.5 degrees on the corner and 22.5 degrees on the saw. That arithmetic is one room. Measure your corner. Fit two offcuts before you cut the lengths that show.
What if the nut will not hold while I walk to the saw?
The saw setting is then a guess. Go back to the corner, reseat the bevel, and tighten again. If a second finger-push still moves the blade, the tool will not carry an angle across a room. UK reviews in this comparison include locks that slip and a thread that failed. Stop the cut and speak to the retailer. Tape on the nut is a poor stand-in for a thread that holds.
Should I mark with a pencil or a knife?
Use a sharp pencil for a first line on softwood and for a line you may still adjust. Use a knife when you want a fine shoulder the saw can find, especially on a joint that will be seen up close. Either mark follows the locked blade. A thick blunt pencil adds its own width to the angle, which shows up when the scrap is offered into the corner. Keep the stock on the same face you used when you took the angle.
When do I need a second bevel?
You need a second one when two corners must stay recorded at the same time. Resetting a single bevel to the second corner deletes the first. A bay, or a skirting run that turns through two different angles, is the usual DIY case. Lock both, and keep them apart so you do not tighten the wrong one. One bevel is enough for a single corner and its scrap test.

Related pages

Best sliding bevel

Sliding bevel

Sliding bevel buying guide: lock, length and stock

Sliding bevel for stairs: pitch, height and sphere

Sliding bevel vs combination square: odd or square

Sources

Public sources named in the research digest, plus the amazon.co.uk listings compared on this page. Retrieved October 2026.

  1. DIY Doctor, Sliding bevel (retrieved October 2026)
  2. Find My Tool, What is a sliding bevel? (retrieved October 2026)
  3. Common Woodworking, Buying a sliding bevel (retrieved October 2026)
  4. MyToolShed, Sliding bevels (retrieved October 2026)
  5. ITS, OX squares and bevels (retrieved October 2026)
  6. Approved Document K (retrieved October 2026)
  7. legislation.gov.uk, Consumer Rights Act 2015, section 9 (retrieved October 2026)
  8. Which?, What to do with a faulty product (retrieved October 2026)