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 . 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. 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. Both Whitworth and British Standard Fine were phased out by the 1960s,but some manufacturers carried on usingboth on applications much later than this.

Duologi is the trading name of Specialist Lending Ltd, which is authorised and regulated by the Financial Conduct Authority (register number 774712). B.A (British Association) are smaller sized fastenings found on older vehicles electrical fittings,magnetos,dynamos,motors,pumps and instruments etc.Sidchrome, Kincrome, TTI, and Milwaukee’s sockets are designed for durability, strength, and use in the most demanding environments. For greater control, you can insert a power tool or torque wrench through the 1/2-inch connection hole. 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.

Stripped it down,Turns out that SU had replaced an insulating piece where the 12v supply went through the body and was soldered to the coil wires, Two bare soldered joints separated by only this new insulator, and it was absorbing moisture and shorting out the supply. Imperial AF spanners are normally used on nuts and bolts threaded UNC or UNF (Unified Coarse or Unified Fine) and use a thread angle of 60 degrees. 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.HEY presto 5mins I had 52mm socket but still have the 55mm undamaged worked a treat-------- job done. It is very common to find an older car or bikethat left its maker witha mixture of imperial and metric nuts and bolts holding it together. No matter what kind of fasteners you need to remove, try one of our many different types of sockets with your wrenches – we are sure you will find what you need! Machine Mart Limited is authorised and regulated by the Financial Conduct Authority, register number 703528 and acts as a credit broker and not a lender. Commonly used Whitworth/BSF threaddiametersand the mm or imperial (inch) size of the wrench opening (across flats)to fit nut or head.

I'm sure hot water cylinders have moved on, but sparkeys still get to work on stuff that's straight out of the ark.Measuring your lock nut ensures you're using the correct socket and tools, making mounting and dismounting hassle-free. A.F means Across Flats and indicates the distance apart the jaws are on an open end wrench (or the parallel sides on a nut or bolt. The Laser 4376 14mm 3/8" Drive Thin Wall Spark Plug Socket has been especially designed to be used on most Citroen vehicles as well as vehicles with Bosch spark plugs, such as the BMW E90335I N54 engine. The Laser 1583 18mm 1/2" Drive Spark Plug Socket is perfect for working on unusually sized spark plugs that are becoming more common and a variety of motorcycles.

British Standard fine is in effect the fine version of whitworth with the same thread form but with a greater number of threads per inch.

You can use the abovechart (and the AF/metric chart below) to find equivalents for some missing tools. 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. This was in the days when Great Britain had a large manufacturing base and didnt simply import cheap junk from the far east. Coarse threads (whitworth,unc etc) are more likely to be used on the thread in a casting(especially aluminium) to give greater strength,most nut and bolt assemblies will use a fine thread,so studs in castings often have a coarse thread end to go in the casting and a fine end to take a nut.