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How to use a combination spanner

Updated: 22 October 2026

The nut is tight, the open jaw is the end in your hand, and a length of pipe is in the toolbox. How to use a combination spanner, before that pipe goes on, is a short sequence: match the size so the head does not rock, break the nut with the ring, pull toward you, and stop when the jaw spreads or the fastener will not move. Prices sit on the [combination spanner comparison](/hub/hand-tools/combination-spanner). Peter F., DIY and tools editor, wrote it on 22 October 2026 from HSE guidance and UK workshop sources, not from a lab test. A qualifying purchase can earn a commission at no extra cost to you.

The nut is tight, the open jaw is the end in your hand, and a length of pipe is in the toolbox.

Our top picks

DISEN DISEN 11-piece ratchet combination set

Best overall

DISEN DISEN 11-piece ratchet combination set
6.6/10about £35.99
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BGS BGS 1197 12-piece combination set

Rank 2

BGS BGS 1197 12-piece combination set
8.1/10about £12.80
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Hilka Hilka 17161102 11-piece metric set

Best value

Hilka Hilka 17161102 11-piece metric set
7.6/10about £8.68
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On this page
  1. 1.Put the ring on first
  2. 2.Use the open end only when the ring will not pass
  3. 3.Pull, and keep a pipe off the handle
  4. 4.When to stop

Put the ring on first

Haynes’ rule for car work is to use the ring where you can. The open jaw acts on two faces. If it slips, it skates across the corners. The ring surrounds the nut. If the head rocks, it is the wrong size. Hagerty UK notes that 13 mm is not 1/2 inch AF. Which millimetre belongs on a modern car is the combination spanner for car repair page. DISEN’s listing says not to use that ratchet on a seized fastener. The family choice is on combination spanner vs ratchet spanner. For the break-loose, use a fixed ring.

Use the open end only when the ring will not pass

The open end earns its place when a pipe, a flange or a hose blocks the ring. Slide the jaw on from the side and seat both faces. If you can see daylight on one flat, it is not on. If it slips at once, stop. Many open jaws are angled at about 15 degrees. BGS 1197 states that angle on the ring end. Flip the spanner for a new bite only after the nut is already moving. The open jaw is the weaker end. HSE INDG229 says to scrap spanners with splayed jaws and spanners that slip.
DISEN DISEN 11-piece ratchet combination set

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DISEN DISEN 11-piece ratchet combination set
6.6/10about £35.99
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Pull, and keep a pipe off the handle

Pull the spanner toward you rather than pushing it away. If the nut breaks free, or the jaw slips, your hand comes back into your own space. Plant your feet so the pull is a controlled lean, not a snatch. Keep a pipe off the handle. HSE INDG229 says not to use a pipe as an extension. If the ring will not start the nut with a normal pull, the fastener is the problem, not the length of the spanner. A hammer on the end is the same mistake. RS Components’ UK note says a ratchet is for a fastener that already turns, and a seized nut can break the ratchet. Pull once, and if nothing moves, stop.

When to stop

If the head rocks, change size or change system. If the jaw has spread, scrap that spanner. If the nut will not start after one seated pull, penetrating oil and time are the household step, not more leverage. Leave heat, a chisel, or cutting the fastener to someone who does that work. Wheel nuts, brakes, steering and suspension have a figure a spanner will not show. If you cannot support the car on rated stands, do not go under it. How the set was chosen, including the gaps inside a “6–22 mm” title, is the buying guide.

Common questions

Which end breaks the nut loose?
Use the ring. It wraps the hex, so a tight nut is less likely to cam the tool off two faces. Haynes states that preference for car work. Seat the ring fully, then pull. If your spanner is a ratchet, use a fixed ring for that first movement. A rocking ring means the size is wrong, and swapping ends will not fix the fit.
When is the open end the right end?
When a pipe, a flange or a hose stops the ring from passing over the nut. Seat both faces, take a small pull, and stop at the first slip. Flip a 15-degree jaw for a new bite only after the nut is moving. If the jaw spreads or polishes the corners, take it off and go back to a ring or a socket.
Should I push or pull?
Pull toward you. If the nut lets go or the spanner slips, your knuckles come back rather than into the part you were pushing against. Stand so the pull is a lean, not a jab. Reposition your feet instead of changing the direction of the force. The same pull applies to the open end and the ring.
Can I slide a pipe over the handle?
No. HSE INDG229 tells you not to use a pipe as an extension, and to scrap a spanner that has splayed or that slips. A tube multiplies the load on a jaw that was not designed for it. A hammer on the handle is the same class of mistake. If a normal pull on a seated ring will not start the nut, use oil, a socket, or a garage.
What if the spanner rocks on the nut?
The size is wrong, or the jaw has spread. A near size, such as 13 mm on a 1/2 inch AF head, rocks and then rounds the hex. Do not continue, and do not add length. Try the next size only if it sits dead. If no metric size sits, the fastener may be AF or Whitworth. A rocking spanner is the signal to change tool.
When do I stop and call someone?
Stop when you would need heat or to cut the fastener, or when the work is brakes, steering, suspension or wheel nuts and you cannot torque them or support the car. A combination spanner does not display a torque figure. Under the car, rated stands come before any extra pull. If the corners are already round, more force makes a worse stud.

Related pages

Best combination spanner sets

Combination spanner

Combination spanner buying guide: sizes, then steel

Combination spanner for car repair: which millimetres

Combination spanner vs ratchet spanner on a free nut

Sources

Sources from the research digest, last checked on 22 October 2026.

  1. HSE, PUWER overview (retrieved 22.10.2026)
  2. HSE, INDG229 Using work equipment safely (retrieved 22.10.2026)
  3. HSE, repetition and upper-limb disorders (retrieved 22.10.2026)
  4. ISO 1711-1:2019 (retrieved 22.10.2026)
  5. Consumer Rights Act 2015, section 22 (retrieved 22.10.2026)
  6. nidirect, buying goods and services (retrieved 22.10.2026)
  7. Hagerty UK, choosing spanners for DIY (retrieved 22.10.2026)
  8. Wheels Alive, threads, spanners and things (retrieved 22.10.2026)