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British Standard Pipe Parallel (BSPP) threads, also known as Whitworth threads, are among the most widely used thread types. The BSPP (parallel) male mates with a BSPP (parallel) female or a female port. The BSPP male has straight threads and a 30° seat. The BSPP female has straight threads and a 30° seat. The BSPP female swivel fitting has a tapered nose that seals against the male cone seat. The BSPP (parallel) connector is similar to, but not interchangeable with, the NPSM connector. In most sizes, the thread pitch is different, and the thread angle is 55° instead of the 60° angle used on NPSM threads.

This is a dryseal thread, the National Pipe Taper Fuel (NPTF) thread, used on both male and female fittings. Although it is still widely used in fluid power systems, it is not recommended by the National Fluid Power Association (NFPA) for hydraulic applications. The NPTF male mates with NPTF, NPSF, or NPSM females. The NPTF male has tapered threads and a 30° inverted seat. The NPTF female has tapered threads and no seat. Sealing occurs through thread deformation. The NPSM female has straight threads and a 30° inverted seat. Sealing occurs on the 30° seat. The NPTF connector is similar to, but not interchangeable with, the BSPT connector. In most sizes, the thread pitch is different. The thread angle is 60°, compared with the 55° angle of BSPT threads.

A metric standpipe assembly consists of three components assembled onto a male fitting: a standpipe, a bite sleeve, and a metric nut. The metric nut is fitted onto the standpipe, followed by the bite sleeve. For DIN light series assemblies, a DIN light metric nut is generally used, while DIN heavy series assemblies require a DIN heavy metric nut. The bite sleeve and standpipe are selected according to the tube outer diameter (OD).

British Standard Pipe (BSP) threads, also known as Whitworth threads, are among the most widely used pipe thread standards. The BSPP (parallel) male mates with a BSPP (parallel) female or a female port. The BSPP male has straight threads and a 30° seat. The BSPP female has straight threads and a 30° seat.

The Society of Automotive Engineers (SAE) specifies the use of a 37° flare or seat for high-pressure hydraulic tubing. These are commonly known as JIC couplings. The JIC 37° flare male will mate only with a JIC female. The JIC male has straight threads and a 37° flare. The JIC female has straight threads and a 37° cone seat. The seal is achieved on the 37° flare seat by establishing a line contact between the male flare and the female cone seat. The threads provide the mechanical connection.

The DIN 24° cone male fitting mates with any of the three females listed: female 24° cone with O-Ring, female metric tube fitting, or female Universal 24°/60° cone. The male has a 24° seat, straight metric threads, and a recessed counterbore that 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. DIN couplings are available in light and heavy series. Proper identification is made by measuring both the thread size and the tube O.D. (the heavy series has a smaller tube O.D. than the light series, but a thicker wall section).

A metric standpipe assembly consists of three components assembled onto a male fitting: a standpipe, a bite sleeve, and a metric nut. The metric nut is fitted onto the standpipe, followed by the bite sleeve. For DIN light series assemblies, a DIN light metric nut is used. For DIN heavy series assemblies, a DIN heavy metric nut is used. The bite sleeve and standpipe are selected according to the tube outer diameter (O.D.).

Different fittings for thermoplastic flexible hoses, standpipes, 90° elbow pipe or nut connection

HB - Female BSPP | HP - Male BSPP

HD - Female DKOS

HC - Female METRIC 24° - 60

HE - Female JIC

HI - Male NPT | HH - Female NPT | OI - Male NPT one piece

HF - Female TYPE-M

HL - Male MP | HM - Male HP | HN - Male HP METRIC | HG - Female HP

HJ - Male GAS | OJ - One-piece Male GAS

HK - Male METRIC

HQ - Male GAS100 External Cone

HR - Male USIT

HS - Male FLAT SEAL | OS - Male FLAT SEAL ONE PIECE