Which is stronger, a ring wrench or an open-end?

The ring wrench. Its closed ring wraps all six corners and spreads load over the flats, while an open jaw presses on two corners only. A seized joint should always be started with a ring.

Twelve-point or six-point?

Twelve-point halves the angle needed to refit the wrench in tight quarters and is the practical choice for general work. Six-point widens the contact and is preferred on worn nuts and at very high torque.

What is an offset ring wrench for?

Its ring is cranked above the handle plane, so when it goes onto a nut sitting on a flat surface there is clearance for your fingers and the wrench does not drag on the surface.

Where is a half-moon wrench used?

Its crescent body reaches over pipework, hoses and cable looms to the nut behind them -- in engine bays and plant rooms where a straight wrench cannot enter.

Does a ratcheting ring wrench carry the same torque?

No. The ratchet is for spinning; the torque peak of the first release belongs on a plain ring end.

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Ring Wrenches

A ring wrench closes a twelve-point box around all six corners of the fastener, loading flats rather than corners, which makes it the hand wrench that carries the highest torque safely. Straight, offset, cranked, ratcheting and flex-head bodies are listed here in metric and SAE sizes.

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Why the ring carries the most torque

A closed ring wraps all six corners of the nut and puts the load on the flats rather than the corners. Where an open jaw presses on two points, a ring triples the contact -- which is what makes it the one hand wrench that can be trusted with the torque peak of breaking a joint loose.

A twelve-point ring engages a hexagon every 30 degrees, halving the angle needed to refit the wrench in a tight space. A six-point ring widens the contact instead and holds better on nuts whose corners are already worn.

Flat, offset and half-moon patterns

The flat ring wrench keeps ring and handle in one plane and is the thinnest pattern -- it works in shallow recesses and in the gap between two parts. On the offset pattern the ring is cranked up out of that plane, leaving clearance between your hand and the surface the nut sits on.

A half-moon wrench is a ring wrench whose body curves in a crescent, so it reaches over pipework, hose runs and cable looms to the nut behind them. It is listed here double-ended in both metric and SAE.

Material and standard

Ring wrenches here are forged from chrome vanadium and chrome plated, to TS 3794 – TS ISO 10103 and TS ISO 10104 Form B. Those standards fix the tolerance on the ring bore and the height of the crank, so the difference in how two same-size wrenches sit on a nut is a measured value rather than a feeling.

Frequently Asked Questions

Which is stronger, a ring wrench or an open-end?
The ring wrench. Its closed ring wraps all six corners and spreads load over the flats, while an open jaw presses on two corners only. A seized joint should always be started with a ring.
Twelve-point or six-point?
Twelve-point halves the angle needed to refit the wrench in tight quarters and is the practical choice for general work. Six-point widens the contact and is preferred on worn nuts and at very high torque.
What is an offset ring wrench for?
Its ring is cranked above the handle plane, so when it goes onto a nut sitting on a flat surface there is clearance for your fingers and the wrench does not drag on the surface.
Where is a half-moon wrench used?
Its crescent body reaches over pipework, hoses and cable looms to the nut behind them -- in engine bays and plant rooms where a straight wrench cannot enter.
Does a ratcheting ring wrench carry the same torque?
No. The ratchet is for spinning; the torque peak of the first release belongs on a plain ring end.