Sealey Sx010 Impact Socket 52Mm 1/2Sq Drive

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S.W) takes its name from the British engineer who invented it as a way of standardising bolt and nut sizes. HEY presto 5mins I had 52mm socket but still have the 55mm undamaged worked a treat-------- job done. Other thread forms that may be encountered on older machinery include BSP (British Standard Pipe) on fuel,air or oil lines etc and very rarely and on much older machinery BCS (British Standard Cycle). Before about 1948 BSW and BSFnuts and bolts(needing BSW/BSF tools) were commonly used on cars,motorcycles and machines especially those made in the U.

This standard was introduced asthe 'new' standard around the 1940sto replace BSW and BSF etc and was supposedly phased outby the 1970's in favour of metric threads and sizes. Usually applied to spanners in imerial (inch based) sizes the smallest increments are normally 1/16inch (for example 7/16,1/2,9/16 etc) but some smaller spanners are marked in 1/32 inch increments. The tapered hex design makes precise fits possible in hard-to-reach locations, while the parallel shank expands and closes flat for use in tight spaces.Bolts and nuts in brass or similar soft metal are normally coarse threaded for greater holding power.

B.A (British Association) are smaller sized fastenings found on older vehicles electrical fittings,magnetos,dynamos,motors,pumps and instruments etc. Land Roverand other smaller,specialised car makersused a mixture of imperial fittings into the 1990's.This is not strictly correct,although some will loosely 'fit' the thread angle on Unified threads is 60 degrees against the55 of Whitworth. bolts and the tools to work on them as British (mainly BSW and BSF)and US (UNF and UNC) machinery used completely different systems. BA spanner and socket sizesin incheswithmetric(mm) equivalents BA (British Associated) is an early British standard often found on dynamos,magnetos,distributors,starters and electrical fittings and connections on older British cars and motorcycles . This was another standard introdued to try and rationalise the sizes of smaller fixings,and which now confuses greatly the metric spanner wielding enthusiast. Damaged bolt heads spoil the restoration or repair of many a rebuilt classic car or motorcycle,theres no need when the correct spanners are still available .

I needed a 75mm a little while ago 'in the field' and could not get back for my socket, the wheel brg had gone so found a 75 mm hex pipe fitting and ground it down slightly got some 30x 6mm heated it and folded it round the hex of the pipe fitting, to form the hex required then welded that to the end of a strip of 14mm thick flat plate, shoved the trucks hyab against the plate to hold it onto the hub and hit the end of the plate with sledge, to undo it, again worked a treat. The easiest way to identify a whitworth or BSF threaded bolt is to measure its diameter and check the thread rate (TPI or threads per inch) with a thread gauge and compare it to the charts below. S.F and MMbolt or nutsand can be used for example to find the next size up or down where a spanner (wrench in USA)or socket is too tight or loose on a fixing. This versatile device is suitable for use with bearings mounted on an adapter or withdrawal sleeve, as well as on a tapered journal.K. After this date they were gradually phased out and replaced by UNC (Unified Coarse) and UNF (Unified Fine) both needing Imperial AF tools.