Imperial Combination Spanner Set - Set of 12 US Size Spanners

Product Information

However like Whitworth and BSF, AF it is still encountered in specialised applications and many car and motorbike makers carried on using imperial fittings etc for a long time after they became supposedly obsolete. A good set will have different size square drive heads always measured in imperial sizes so a typical socket set will have 1/2-inch, 1/4-inch and 3/8–inch sizes, with correspondingly-sized sockets and wrenches for larger or smaller jobs. This is because some imperial tools make a good fit for metric nuts, bolts, etc, and vice versa (though of course many don't). Once you know the thread type and size of the nut, then it is simple to look up the correct spanner size.

Imperial Spanner Sets - Machine Mart Imperial Spanner Sets - Machine Mart

Land Roverand other smaller,specialised car makersused a mixture of imperial fittings into the 1990's. The company was in the throws of changing thread forms from CEI to BSF, properly entitled ASF 'cos it was American standards they were adopting.The Joker performs fastening jobs in almost every conceivable situation, quickly and with great precision. Whitworth set out the thread angle and pitch of a bolt, which increases in a ratio the larger the bolt becomes. Wrenches have a thicker “head" with an adjustable/movable lower “jaw” and are designed to drive nuts and bolts of a range of sizes. In 1919, Morris Motors took over the French Hotchkiss engine works which had moved to Coventry during the First World War. Socket and spanner sets very often feature a ratchet system, meaning they don’t have to be lifted off the nut between turns.

Spanner Size comparison Chart | EICAC

inch is not a commonly encounteredWhitworth size,13/16 inch and 15/16 inch are even less so and were very seldom specified on engineering drawings etc. Please note that a socket or spanner should fit snugly, or rather, tightly on a bolt or nut in clean and good condition.A metric M6 nut is likely to be 10 mm across the flats, a 1/4" UNC likely to be 11 mm (and a 1/4" BSP nut would be more like 23 mm across the flats). The adjustable mechanism enables a single spanner to tackle numerous gauges of nuts and fasteners, which can be handy for smaller portable tool kits where it’s always helpful to save on space and carry weight.

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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. It may be helpful to first explain that spanners and sockets aren't actually the size marked on them. As a cost-effective utility tool, most open-ended spanner sets will offer a wide range of sizes and gauges in a typical kit.And each of these thread types has their own thread specifications and also specify the distance across the flats of the nut. Combination spanners are the most common type found in sets and have an open end and a ring end, both of the same size. And they all have different measurements depending on the international standard they are manufactured to. These are split between conventional and stubby, and imperial and metric, making them ideal if you work on both modern and classic cars. As well as the ‘imperial’ and ‘metric’ we all know and love, imperial is commonly referred to as ‘A/F’.

Convert,compare all Imperial tool,nut,bolt and spanner sizes

If a socket is to be rotated directly by hand, with no bar, then generally anything that even loosely fits will do. In practical terms, this simply means that a flexible head spanner set can be used to access fasteners in a much wider variety of tricky or confined spaces, because the user can approach the nut from a much broader array of positions. However, they can often be manoeuvred into smaller spaces than box or socket spanners, particularly if the design features a ‘cranked’ or offset head design.The 5⁄ 32in Whitworth threads have been the standard Meccano thread for many years and it is still the thread in use by the French Meccano Company.