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Combination spanners are a combination of a box-ended spanner and an open-ended spanner. One side has a closed ring for hexagonal or square nuts, and the other end is an open U-shape. Ring spanners have round rings at either one or both ends. The heads fit either hexagonal or square bolt heads and should be able to loosen tough bolts. Spanners on the other hand are specific to the size of the nut and bolt. You’ll need the right size spanner for the screw you have. Open-ended spanners have just one open end. These are single-piece tools that can be used on most fasteners.
The confusion comes from American English, where the word ‘wrench’ refers to both a spanner and a wrench. What are the different spanner types? Ratcheting spanners are very popular – you don’t have to disengage the spanner head from the nut or bolt each time you make a turn. Most spanners are made from steel, which is a mixture of iron and carbon. Some spanners are made from titanium. A reversible ratcheting spanner lets you change direction from tightening to loosening and vice versa , again without removing the spanner head from the bolt. Double-end spanners have open ends at both ends. These spanners are most widely used, with both ends able to hold nuts and bolts within them.Adjustable spanners typically feature a standard layout open-ended head design, but with an additional function that allows for manual opening or closing of the spanner’s jaw via a rotating cylinder driven by a screw. The familiar ‘monkey wrench’ design is essentially a type of adjustable spanner, although many tools can be found in this range that are considerably smaller and lighter than a typical heavy-duty plumbing wrench. Ratchet spanner sets are often among the more expensive types of spanner kits, but their handy added functionality makes them easily one of the most popular designs found in both professional and enthusiast tool kits the world over. We used the word ‘wrench’ to refer to adjustable wrenches; those with a movable lower jaw that allows you to loosen different size nuts and bolts. One wrench can cover a range of sizes of fastening.
Imperial measurements have largely been replaced with metric sizes these days. The most popular sets include spanners ranging in size from 8 – 19 mm.Size markings stamped into the steel are very useful and colour-coded sizes are becoming increasingly popular too. A toolbox is not complete without a set of spanners. When nuts or bolts need tightening or loosening, you need the best combination spanner, ratcheting spanner or adjustable spanner that you can lay your hands on. Construction The function of a spanner hasn’t changed since it was invented, but there have been many clever innovations and inventions added over the years.
While wrenches and spanners are essentially built to do the same job, they are in fact separate tools. Both wrenches and spanners are used to unscrew or loosen nuts and bolts. Ideally, you should combine a solid set of traditional ring spanners with the convenience of a ratcheting spanner set. An adjustable spanner or wrench is very handy too.
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