[V8bassman]

Must clear up a couple of things.

The BSP threadform developed out of the old Whitworth thread and the two are to all intents and purposes one and the same. The number 14 refers to the number of threads per inch, and is 14 on 1/2", 5/8" and 3/4" BSP threads, so your oil cooler thread will be one of these. I suspect it will be 1/2"BSP as this is very common on oil coolers. To check, measure the outside diameter of the thread, If it is indeed 1/2"BSP, it will measure 21mm or thereabouts depending on the tolerances to which the thread has been turned. It is a common misconception that BSP thread size refers to the actual diameter of the thread. In fact the size quoted actually refers to the inside diameter of the pipe on which the thread has been turned. So if the 1/2" is actually the nominal bore of the pipe, the thread turned on the outside of the pipe will be 1/2"BSP (British Standard Pipe thread).

JIC is actually an american thread form (JIC stands for Joint International Conference) and is identical in thread diameter and pitch to SAE and UNF, the only difference being the angle of the cone seat on the fitting which forms the metal to metal seal. JIC / UNF is a very common threadform on Goodridge / Aeroquip type hose fittings.

As far as hydraulic hoses are concerned, nowadays there is a bewildering variety of threadforms around, and many OEM manufacturers produce their own threads to try and prevent the likes of me supplying a much more economically acceptable alternative to their products. Doesnt stop me though, I can usually get around the problem somehow. However, by far and away the most common thread we deal with here is still the good old BSP.

Hope this helps.