BSP Thread Gauge| How to identify and Measure pipe and non-pipe threads
BSP thread gauge or the British Pipe Standard fitting thread gauge is one of the highly versatile threads used across the globe today. The BSP thread is made in two versions – parallel and tapered, like other pipe thread gauges. In both the types of BSP thread gauges , the thread flank angle is 55 degrees. Many times, BSP tapered thread is mistaken as the NPT. However, the NPT thread gauges have a thread flank angle of 60 degrees. The BSP thread comes in imperial sizes of 1/8, ¼, ½, 1, 2 and so on. Typically, the BSP threads seal through a 30-degree chamfer in the male threads and with 30 degrees recessed cone in a female thread. Some considerations on application In case of a port, the application one requires to use is either a bonded washer or an O rings alongside washer for a complete seal in the parallel thread gauges. In case of tapered BSP thread gauges, the sealing is done across the thread winding and using a Teflon tape or a thread dope for additional help.