Coupling Identification - French
There are five coupling systems generally used for hydraulic connections today. They are identified geographically or by country as:
French Thread Types
Popular couplings are French GAZ. These have a 24° seat and metric threads. These are similar to German DIN couplings, but the threads are different in some sizes. Although both are metric threads, the French use fine threads in all sizes and German DIN couplings use coarse threads in larger sizes. Most port connections are flange connections. French flanges are different than SAE & hellip; they have a lip that protrudes from the flange face. These are called Poclain style flanges.
GAZ 24°
The French Metric (GAZ) male will mate with the female 24° cone or the female tube fitting.
The male has a 24° seat and straight metric threads. The female has a 24° seat or a tubing sleeve and straight metric threads.
When measuring the flare angle with the seat angle gauge, use the 12° gauge. (The seat angle gauge measures the angle from the connector centerline.)
French Metric (GAZ)
| Metric Thread Size | Male Thread O.D. mm | Female Thread I.D. in | Tube O.D. mm |
| M20x1.5 | 20.0 | 18.5 | 13.25 |
| M24x1.5 | 24.0 | 22.5 | 16.75 |
| M30x1.5 | 30.0 | 28.5 | 21.25 |
| M36x1.5 | 36.0 | 34.5 | 26.75 |
| M45x1.5 | 45.0 | 43.5 | 33.50 |
| M52x1.5 | 52.0 | 50.5 | 42.25 |
GAZ Poclain 24° Flange
The Poclain (French GAZ) 24° high pressure flange is usually found on Poclain equipment.
The male flange will mate with a female flange or a port. The seal is made on the 24° seat.
Poclain (French GAZ)
| Nominal Size | A | B | C | D | E | F |
| (in) | (in) | (in) | (in) | (in) | (in) | (in) |
| 1/2 | 1.57 | .72 | 2.20 | 1.89 | .55 | .35 |
| 5/8 | 1.57 | .72 | 2.20 | 1.89 | .55 | .35 |
| 3/4 | 2.00 | .94 | 2.75 | 2.38 | .71 | .43 |