All Categories

Home> Blogs> Description of Hydraulic Fittings Standards

Description of Hydraulic Fittings Standards

2022-06-29 Page view : 6 views

1. British standards

SAE reverse taper fittings

 

It is a misconception that all foreign threads are metric. This is not usually the case. There are two common thread forms – metric thread and Wyeth standard thread (BSP). British standard straight pipe (BSP) thread, also known as Wyeth standard thread. It can be either straight thread (BSPP) or conical thread (BSPT) with an inverted cone face.

The flange is similar to SAE61 or 62 flanges (except -10*). Port connections are usually made through BSPP threads. Its seal adopts soft metal seal ring. BSPP(straight) external threads can be fitted with BSPP(straight) internal threads or internal thread ports. BSPP external threads are straight threads with 30° taper seat. BSPP internal thread is also straight thread with 30° taper seat. The inner threaded ports are straight threaded with seal face. The seal at the port is formed by an O-ring or soft metal pad on the outer threaded fittings.

The BSPP(straight thread) connector is similar to the NPSM connector but not interchangeable. Most sizes of threads have different pitch, with thread profile Angle being 55° and NPSM thread profile Angle being 60°(-10 is non-SAE flange)

 

 

British Standard straight Pipe thread (BSP)

 

British standard Whey straight pipe (BSP) thread, also known as Whey standard  thread. It can be either straight thread (BSPP) or conical thread (BSPT) with an inverted cone face. The flange is similar to SAE61 or 62 flanges (except -10*). Port connections are usually made through BSPP threads. Its seal adopts soft metal seal ring. BSPP(straight) external threads can be fitted with BSPP(straight) internal threads or internal thread ports. BSPP external threads are straight threads with 30° taper seat. BSPP internal thread is also straight thread with 30° taper seat. The inner threaded ports are straight threaded with seal face. The seal at the port is formed by an O-ring or soft metal pad on the outer threaded adapter or fittings. The BSPP(straight thread) connector is similar to the NPSM connector but not interchangeable. Most sizes of threads have different pitch, with thread profile Angle being 55° and NPSM thread profile Angle being 60°(-10 is non-SAE flange)

 

 

English standard taper pipe thread (BSPT)

 

Description: BSPT(cone) external thread can be matched with BSPT(cone) internal thread or BSPP(straight) internal thread. BSPT external thread is taper thread. When fitted with BSPT(taper) internal thread or BSPP(straight) internal thread ports, a seal is formed at the thread. BSPT and NPTF fittings are similar but not interchangeable. Most of its threads have different pitch, with a thread profile Angle of 55° as opposed to 60° for NPSM threads

 

2.French standard

 

French GAZ is a common pipe fittings. This fittings is metric thread with 24° taper seat. Similar to German DIN fittings, but the threads are different in some dimensions. Although both are metric threads, all French fittings use fine thread, while the German DIN fittings are larger and use coarse thread. Most end connections are flange. French standard flange is different from SAE and Hellip standard flange; The flange face has a raised boss. This flange is called a Poclain flange.

[1]  GAZ24 °

[2] GAZ Poclain24° flange

 

3. German Standard

German DIN(German industrial Standard) is commonly used pipe fittings. A metric connection is usually a DIN connection. The flange is standard 61 or 62 flange (except -10).

DIN 24° taper ball head thread

Description: The external thread fittings is a ball head metric straight thread with a 24° cone seat and a ball head countersunk hole, which matches the outer diameter of the inner pipe of the pipe fittings used, and the internal thread matching with the external thread includes O ring, 24° cone ball head internal thread of the metric pipe fittings, or the general 24° or 60° cone ball head internal thread and so on.

 

4. DIN 60° taper ball head thread

Note: DIN60° taper ball head external thread fittings can only be matched with universal 24° or 60° taper ball head internal thread fittings. External thread is metric straight thread with 60° taper seat. Internal thread is metric straight thread with universal 24° and 60° taper seat. When measuring cone Angle with a cone seat Angle gauge, a 30° cone Angle gauge should be used. (Use the taper seat Angle gauge to measure along the centerline of the fittings.)

 

DIN 3852 C metric and Wyeth standard taper thread fittings

Note: DIN 3852 TYPE C couplings can be either metric or Wyeth inch threads. Both inner and outer pipe fittings are taper thread. The seal is formed at the thread. DIN 3852 Type C fittings are available in three series: ultra-light series (LL), light series (L) and heavy series (S).

 

Metric sleeve type pipe joint assembly

Description: The metric pressure sleeve head assembly consists of three parts connected to an external connector. These three parts are: tube core, pressure sleeve and metric nut. The nut is assembled on the tube core, and then the pressure sleeve is assembled. DIN Light series assembly uses DIN light series metric nuts, while DIN heavy series assembly uses DIN heavy series metric nuts. Pressure sleeve and tube core are selected according to the desired outer diameter of inner tube.

If you are looking for hydraulic fittings manufacturer, supplier, company, wholesaler. Please contact us.