Thu Apr 18, 2019 1:26 pm
I'm assuming that Bolkow is Eastern Bloc, therefore likely to be Metric. The thread into the Oleo is likely just that, a standard Metric profile and pitch.
the "connector"end is possibly a different story, but at first glance appears ti bear a marked resemblance to a disposable gas-cartridge connection.
Thread -pitch gauges are available in Imperial, unified and metric sets. rather like a set of feeler-gauges, they have a serrated end-section on each blade. Select a near match and try it in the threads you wish to identify. (or you could manually count the pitch
wrap a clean strip of paper tightly around the projecting threads, rub with a dirty finger and you will transfer a series of lines , corresponding to the threads (think brass-rubbing!)
As almost everything is standardised, I'd take a wild guess that it's a metric pipe thread.
There is bound to be a tutorial on thread- identification , on the net. note the first couple of threads at 6-o'clock have been damaged If a correct connector will not fit, the damage can be dressed-out with a swiss file (ebay,screwfix and many others)