Popular couplings British Standard Pipe (BSP) threads, also known as Whitworth threads.
The BSPP (parallel) male will mate with a BSPP (parallel) female or a female port. The BSPP male has straight threads and a 30
The Society of Automotive Engineers (SAE) specifies a 37? angle flare or seat be used with high pressure hydraulic tubing. These are commonly called JIC couplings. The JIC 37? flare male will mate with a JIC female only. The JIC male has straight threads and a 37? flare seat. The JIC female has straight threads and a 37? flare seat. The seal is made on the 37? flare seat by establishing a line contact between the male flare and the female cone seat. The threads hold the connection mechanically.
The DIN 24° cone male will mate with any of the three females listed: Female 24° cone with O-Ring, Female metric tube, Female Universal or 60° cone.The male has a 24° seat, straight metric threads, and a recessed counterbore with matches the tube O.D. used with it.The mating female may be a 24° cone with O-ring (DKO type), a metric tube fitting or a universal 24° or 60° cone.There is a light and heavy series DIN coupling. Proper identification is made by measu ring both the thread size and the tube O.D. (the heavy series has a smaller tube O.D. than the light, but has a thicker wall section).
A metric standpipe is comprised of three components attached to a male f tting. The components are: a Standpipe, Bite Sleeve and Metric Nut. The nut is placed over the Standpipe, followed by the Bite Sleeve. For DIN light assemblies, a DIN light metric nut is used. For DIN heavy assemblies, a DIN heavy metric nut is used. The Bite Sleeve and Standpipe are selected on the basis of tube O.D.