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Popular couplings are German DIN (Deutsche Industrial Norme). A coupling referred to as metric, usually means a DIN coupling. Flanges are standard Code 61 or Code 62 (except -10)*. *(-10 is a non-SAE size flange)
German DIN 24° Cone
The DIN 24° cone male will mate with any of the three females shown.
The male has a 24° seat, straight metric threads, and a recessed counterbore which matches the tube O.D. of the coupling used with it. The mating female is a 24° cone with O-ring, 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 measuring 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.)
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.)
DIN 24° Male and Mating Female
| Metric Thread Size |
Male Thread O.D.
(mm) |
Female Thread I.D. (mm) |
Tube O.D. Light Series (mm) |
Tube O.D. Heavy Series (mm) |
| M12x1.5 |
12 |
10.5 |
16 |
- |
| M14x1.5 |
14 |
12.5 |
18 |
- |
| M16x1.5 |
16 |
14.5 |
10 |
18 |
| M18x1.5 |
18 |
16.5 |
12 |
10 |
| M20x1.5 |
20 |
18.5 |
14 |
12 |
| M22x1.5 |
22 |
20.5 |
15 |
14 |
| M24x1.5 |
24 |
22.5 |
- |
16 |
| M26x1.5 |
26 |
24.5 |
18 |
- |
| M30x2.5 |
30 |
28.0 |
22 |
20 |
| M36x2.5 |
36 |
34.0 |
28 |
25 |
| M42x2.5 |
42 |
40.0 |
- |
30 |
| M45x2.5 |
45 |
43.0 |
35 |
- |
| M52x2.5 |
52 |
50.0 |
42 |
38 |
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