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Spanner, Double Ended Open Jaw
Dual-Sized Ends: Each tool provides two different sizes (e.g., 10mm and 11mm), maximizing the utility of the tool kit and reducing the number of individual pieces needed.
15 Jaw Offset: The angled head allows for a smaller "recovery angle," enabling the user to turn fasteners even in cramped mechanical assemblies by flipping the tool.
$1.86
Quick Answer: A double ended open jaw spanner is a hand tool with a U-shaped open jaw at each end, each sized for a different hexagon nut or bolt head. The open jaw slides onto a nut from the side, so it can reach fasteners where a ring spanner cannot be slipped over.
Two Sizes and an Angled Head
Each end of this open jaw spanner fits one size of nut, and the size is usually stamped on the shank. The jaws are normally set at a small angle to the handle, commonly around 15 degrees. In a cramped space where the handle can swing only a short distance, the user turns the nut, lifts the spanner off, flips it over and refits it, and the angled head then engages a fresh pair of flats. That flip is what makes an open-ended spanner practical in tight corners.
An open jaw grips only two flats of the hexagon, so it transmits less force than a ring spanner before it slips, and a worn or loose jaw can round a nut’s corners. Use the open end to run nuts on and off quickly, and a bihexagonal ring spanner for breaking a tight nut loose or for final tightening.
Applications
- Fitting and fitter-trade practicals in engineering workshops and TVET institutes
- Assembling and maintaining apparatus frames, stands and equipment rigs
- Bicycle and small-machine maintenance in STEM clubs
- Servicing laboratory furniture fixings and equipment mounts
Specifications
| Type | Double ended open jaw spanner |
| Jaws | Two open jaws, one size at each end |
| Head angle | Jaws angled to the handle (usual design) |
| Grip | Two flats of a hexagon nut or bolt |
| Jaw sizes and material | Confirm at enquiry |
Care & Handling
- Pull the spanner towards you rather than pushing it, so your hand does not strike anything if it slips.
- Make sure the jaw is fully seated on the flats before applying force.
- Never extend the handle with a pipe or strike it with a hammer.
- Wipe off oil and grit and store spanners in size order.
Why Choose LabEquip
Engineering colleges, ITI and TVET workshops and lab maintenance teams usually buy open jaw spanners in sets covering the nut sizes they meet. LabEquip lists this spanner in the General Lab Products range; send the sizes you need through the contact page.
Frequently Asked Questions
Why are the jaws angled to the handle?
The angle lets you flip the spanner over after a short swing and engage a new pair of flats. This lets you keep turning a nut in a confined space.
When should I use a ring spanner instead?
Use a ring spanner to break a tight nut loose or for final tightening. It grips all six corners and is less likely to slip or round the nut.
Why does the spanner slip off the nut?
The jaw may be the wrong size, worn or not fully seated, or the nut’s corners may already be rounded. Check the size marking and seat the jaw fully.
Are metric and inch spanners interchangeable?
Only by coincidence at a few sizes. Use the spanner system that matches the fastener, as a near fit damages nut corners.
Can I hammer the spanner to loosen a stuck nut?
No. Striking a spanner can crack it or send it flying. Use penetrating oil and a ring spanner, or a tool designed for impact.
How should spanners be stored in a student workshop?
Keep them in a rack or roll in size order so missing tools are noticed, and check that jaws are not spread or cracked.
Last Updated: September 2026
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