The jaws of the spanner should snuggly fit with little or no gap. As shown on this diagram the dimensions labelled "S" is the 'across the flats (AF)' measurement. And it is the distance across the flats of the nut that is most important when choosing a spanner size. And each of these thread types has their own thread specifications and also specify the distance across the flats of the nut. There are many thread types, Metric, UNF, BSW, BSP to name a few. Most spanners do have their size stamped on them, but this is usually the distance across the flats of the nut and can be confusing, so we will help you to determine the size you need, and show why you should not just grab one that seems close enough. Most common are open-ended, ring spanners or combination open / ring spanners like these: The immediate answer is another question: " What type of thread does your nut have?"Ī "Spanner" is often called a "wrench" and is generally used to grip a nut or bolt while applying torque or put more simply to help you fasten and loosen nuts and bolts. " What Size Spanner do I need ?" is a common question.
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