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How to use a pliers wrench

Updated: October 2026

You have the pliers wrench out of the packet, the nut is plated, and you would rather not round the corners on the first turn. How to use a pliers wrench comes down to three moves: seat the button on a tooth, close the smooth faces on the flats with no rock, and turn only while the grip stays square. This follows the Knipex 86 description, BuildWiz's UK notes, and amazon.co.uk reviews read on 16 October 2026. There was no workshop test. Lengths and prices are on the [pliers wrench comparison](/hub/pliers/pliers-wrench). A purchase through a link can earn a commission.

You have the pliers wrench out of the packet, the nut is plated, and you would rather not round the corners on the first turn.

Our top picks

WORKPRO WORKPRO 180 mm pliers wrench

Best overall

WORKPRO WORKPRO 180 mm pliers wrench
8.5/10about £16.99
View offer
WORKPRO WORKPRO 250 mm pliers wrench

Alternative

WORKPRO WORKPRO 250 mm pliers wrench
7.5/10about £19.99
View offer
WORKPRO WORKPRO 180 and 250 mm pliers wrench set

Preis-Tipp

WORKPRO WORKPRO 180 and 250 mm pliers wrench set
8.3/10about £29.99
View offer
On this page
  1. 1.Set the opening before you load it
  2. 2.The ratchet stroke
  3. 3.If the button sticks or the jaws do not meet
  4. 4.When to stop and call someone

Set the opening before you load it

Press the button and slide the jaw until the smooth faces sit on the flats, then let the button seat on a tooth. Knipex describes setting the joint so that it locks before you pull. If the button sits half down, between teeth, it should pop out once a tooth is seated. Close the faces until they meet the flats with no rock. A gap on one side is how a smooth jaw still rounds a nut. On a compression joint, hold the fitting body so the pipe does not twist. The WORKPRO 180 mm claims up to 40 mm, the class for a 22 mm compression nut at about 32 mm across flats. Choosing a length is on the pliers wrench buying guide.

The ratchet stroke

Squeeze to turn the nut a fraction of a flat. Ease the handles so the jaws skip forward, then squeeze again. That is the ratchet stroke Knipex and PHPI describe for installers. The button stays seated. Shared WORKPRO texts say you reset the opening instead of finishing in one long squeeze. Stahlwille says a pliers wrench is not the tool for high torque, and these sources give no torque number. When the handles are at full squeeze and the nut has not moved, stop. Do not slide a tube over the handles. The split is on pliers wrench versus adjustable spanner.
WORKPRO WORKPRO 180 mm pliers wrench

Testsieger

WORKPRO WORKPRO 180 mm pliers wrench
8.5/10about £16.99
View offer

If the button sticks or the jaws do not meet

A button that stays buried in the handle matches a fault in the WORKPRO reviews. At least one buyer returned the tool. One shared review mentions that the top cap of the button can be taken off. That is a complaint, not a repair to copy. Jaws that do not meet are the other stop. On the WORKPRO set, UK reviews say the faces do not line up. Close the tool against a window. A wedge of light means you send it back under the Consumer Rights Act 2015, before it touches a finished nut.

When to stop and call someone

Stop if the part is live. Plastic grips on these listings are comfort grips. None states VDE or IEC 60900, and ISO 5743 does not treat a plastic coating as insulation. CIPHE names Knipex 86 06 250 as the VDE model, and it is not in this set. Stop if the fitting is gas. In Great Britain that work belongs to a Gas Safe registered engineer. Stop if a compression joint weeps after you have nipped it, or if a joint is seized out of sight. A visible tap connector that moves with hand pressure is household work. A round bottle trap needs a strap. If the button will not return, today's job is a return.

Common questions

How do I set the jaw?
Press the button, place the smooth faces on the flats, and let the button seat on a tooth so the joint locks before you pull. If the button is only half down, move until a tooth catches and it springs out. On a compression joint, a second tool should hold the fitting body so the pipe does not twist.
Why does the button stay half down?
Between teeth, a half-pressed button is what users of the Knipex pattern describe before the adjuster sits on a tooth. It should pop out once a tooth is seated. If the button never springs back after you let go, that matches the WORKPRO reviews that ended in a return. Do not pry a cap off as a home repair.
How does the ratchet stroke work?
Squeeze to turn the nut a little, ease the handles so the jaws skip forward, then squeeze again. The button stays seated. Shared WORKPRO reviews say the jaw travel is limited, so you reset the opening when the stroke runs out. If the nut needs a long, heavy pull, switch to a spanner.
What if the jaws do not meet?
Do not use that tool on a finished fitting. UK reviews of the WORKPRO set include jaws that do not line up, and a twisted face will mark chrome. Close them against the light. A wedge of daylight is a fault. The Consumer Rights Act 2015 is the route when the tool is not of satisfactory quality.
Can I put a tube on the handles?
Leave the handles as they are. A tube raises the load beyond the grip the tool was sold with. If the tool is provided for work, HSE expects it to be suitable, not extended. If the nut will not move at a full hand squeeze, it wants a ring spanner, a socket, or a tradesperson.
Are the handles safe on live wires?
The handles on these listings are plastic for comfort. The listings do not state VDE, IEC 60900, or any live-working rating, and ISO 5743 does not specify insulating coatings. The VDE model CIPHE names is Knipex 86 06 250, which is not in this comparison. Live work needs a tool that states an insulation rating.
When do I stop and call someone?
Call a Gas Safe registered engineer for gas fittings and appliances in Great Britain. Call a plumber if a concealed joint is seized, or if a compression joint weeps after you have nipped it. Stop if the part is round chrome, if the button will not spring back, or if the jaws do not meet.

Related pages

Pliers wrench on chrome

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Best pliers wrench UK: top pick and best-value set

Pliers wrench buying guide: choose the right length

Pliers wrench vs adjustable spanner: the jaw split

Sources

Knipex product pages, HSE, and ISO, checked on 16 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the display file.

  1. Knipex 86 03 180 pliers wrench (retrieved 16 October 2026)
  2. Knipex 86 03 250 product data sheet (retrieved 16 October 2026)
  3. Knipex pliers wrench family data sheet (retrieved 16 October 2026)
  4. HSE: PUWER overview (retrieved 16 October 2026)
  5. ISO 5743:2021 pliers and nippers (retrieved 16 October 2026)
  6. amazon.co.uk: Knipex 86 05 180 (retrieved 16 October 2026)
  7. Screwfix: Knipex pliers wrench 180 mm (retrieved 16 October 2026)
  8. BuildWiz UK: strap wrench (retrieved 16 October 2026)