Imperial Combination Spanner Set - Set of 12 US Size Spanners

Product Information

Away from the specialist equipment we checked comfort, length and looked for clear size markings, a case or holder, plus the inclusion of our essential eight, 10, 12, 13, 17 and 19mm spanners. AF is short for “across the flats” and again, it’s a literal measurement so if the spanner is marked 1/2 then it means the distance across the flats of the nut or bolt it fits is 1/2 an inch. The main advantage of a ratchet spanner over a non-ratchet or regular type spanner is that, where space for a full rotational arc is limited, they don’t need to be removed from the nut and realigned in between turns. This means that if the size stamped on a spanner is 1/8th BSW, the distance between the flats of the spanner won’t be 1/8th of an inch. Bolts and nuts in brass or similar soft metal are normally coarse threaded for greater holding power.

Spanner Conversion Chart - Blogger MM, AF, BSW, BSF Spanner Conversion Chart - Blogger

This was in the days when Great Britain had a large manufacturing base and didnt simply import cheap junk from the far east. But the 10mm spanner was marginally oversize and the 13mm started to bend in the torque-misuse test. Modern metric spanners are marked or sized in the same way as AF but in millimetres,the distance again between parallel faces of an open ended spanner or wrench. Wrenches and Spanners are tools designed and used to grip screwed components (mainly nuts, pipe connectors, and bolts) to loosen or tighten them.

The Leica Thread-Mount used on rangefinder cameras and on many enlarging lenses is 1 + 17⁄ 32in by 26 turns-per-inch Whitworth, an artifact of this having been developed by a German company specializing in microscopes and thus equipped with tooling capable of handling threads in inches and in Whitworth. All our essentials are present, but if you work on larger vehicles, there are also common sizes up to 32mm. They’re very useful but like a ring spanner, better quality examples have slimmer components which again, helps when space is tight.

Socket Set: Choosing spanners for DIY | Hagerty UK Socket Set: Choosing spanners for DIY | Hagerty UK

However, I accept no responsibility for damage or injury, however caused, due to the use of this data. The Joker performs fastening jobs in almost every conceivable situation, quickly and with great precision.

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Spanner Size comparison Chart | EICAC

M. (2008) Machinery's handbook: a reference book for the mechanical engineer, designer, manufacturing engineer, draftsman, toolmaker, and machinist, 28th Ed. So using the 1/4" UNC (11mm) spanner instead of the M6 spanner (10 mm) means the spanner will easily fit over the M6 nut, but it would be a little loose.Ratchet spanners are ring spanners comprising a ring within a ring, the inner part rotating in one direction and not the other, so the spanner is used like the ratchet wrench of a socket set. Although Continental Europe has always used metric sizes, metric didn’t become the standard in Britain until the 1970s, after the British Standards Institution recommended that British industry switch to International Standards Organisation (ISO) metric thread.