Post #9555

Fun stuff... Chinese hydraulic parts seem to come with BSP (British Standard Pipe) straight threads. They seal with an oring. Yesterday I was trying to get my grapple's cylinder to fit my hoses because the shipping company broke one of the 90degree adapters. So what I found was BSP 1/4" is what was on the cylinder despite the OD of the thread being 0.52inches. I thought this was odd. So the more I checked in to it, the more convoluted it gets. It seems BSP is a pseudo metric fitting. Sure, you can get a BPS 1/4" but its actually the same as DIN8 (8mm thread). The thread diameter is 0.518" or 13.157mm . So the thread diameter is not a round number in english nor SI units. But the thread pitch is spec'ed in threads per inch. So they've managed to create a standard that doesn't clearly fit in either system. gaaaaaahhhhhhhh.... So because my local hydraulic shop didn't have an adapter to go from BSP 1/4 to DIN like my hose, we had to cut the end off and install a JIC 4 (American Joint Industry Council). At least the JIC connectors are clearly stamped JIC4.