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Coupling Identification - German DIN (Deutsche Industrial Norme)

There are five coupling systems generally used for hydraulic connections today. They are identified geographically or by country as:

 

German Thread Types

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)*.

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 deg. Male and Mating Females
DIN 24° male and Mating Females

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
12.0
10.5
6
-
M14x1.5
14.0
12.5
8
-
M16x1.5
16.0
14.5
10
8
M18x1.5
18.0
16.5
12
10
M20x1.5
20.0
18.5
14
12
M22x1.5
22.0
20.5
15
14
M24x1.5
24.0
22.5
-
16
M26x1.5
26.0
24.5
18
-
M30x2.0
30.0
28.0
22
20
M36x2.0
36.0
34.0
28
25
M42x2.0
42.0
40.0
-
30
M45x2.0
45.0
43.0
35
-
M52x2.0
52.0
50.0
42
38

 

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DIN 60° Cone

The DIN 60° cone male will mate with the female universal 24° or 60° cone connector only.

The male has a 60° seat and straight metric threads. The female has a 24° and 60° universal seat and straight metric threads.

When measuring the flare angle with the seat angle gauge, use the 30° gauge. (The seat angle gauge measures the angle from the connector centerline.)

Din 60 deg. Male and Mating Female
DIN 60° Male and Mating Female

Metric
Thread Size
Male Thread
O.D. mm
Female Thread
I.D. mm
Tube O.D.
mm
M12x1.5
12.0
10.5
6
M14x1.5
14.0
12.5
8
M16x1.5
16.0
14.5
10
M18x1.5
18.0
16.5
12
M20x1.5
20.0
18.5
14
M22x1.5
22.0
20.5
15
M24x1.5
24.0
22.5
-
M26x1.5
26.0
24.5
18
M30x2.0
30.0
28.0
22

 

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DIN 3852 Couplings Type A & B
(Parallel Threads)

The male DIN 3852 Type A & B couplings will mate with the female DIN coupling shown below.

The male and female type A & B couplings have straight threads. Sheet 1 refers to straight metric threads, and sheet 2 refers to straight Whitworth threads. The seal occurs when the ring seal (Type A) or the face seal (Type B) mates with the face of the female port.

These are two series of DIN 3852 Type A & B couplings, the light (L) and the heavy (S) series.

Male Type A, Din 3852
Male Type B, DIN 3852

 

Series
Tube
O.D.
mm
Male Metric Thread Parallel
DIN 3852 Type A & B
Sheet 1
Male Whitworth Thread Parallel
DIN 3852 Type A & B
Sheet 2
Metric
Thread
Size
Thread
O.D.
mm
A
mm
B
mm
C
mm
Whitworth
Thread
Size
Thread
O.D.
in
A
mm
B
mm
C
mm
L
Light
6
10x1
10
14
1.5
8
1/8-28
3/8
14
1.5
8
8
12x1.5
12
17
2.0
12
1/4-19
1/2
17
2.0
12
10
14x1.5
14
19
2.0
12
1/4-19
1/2
19
2.0
12
12
16x1.5
16
21
2.5
12
3/8-19
21/32
21
2.5
12
15
18x1.5
18
23
2.5
12
1/2-14
13/16
23
2.5
12
18
22x1.5
22
27
3.0
14
1/2-14
13/16
27
3.0
14
22
26x1.5
26
31
3.0
16
3/4-14
11/32
31
3.0
16
28
33x2
33
39
3.0
18
1-11
15/16
39
3.0
18
35
42x2
42
49
3.0
20
11/4-11
121/32
49
3.0
20
42
48x2
48
55
3.0
22
11/2-11
17/8
55
3.0
22
S
Heavy
6
12x1.5
12
17
2.0
12
1/4-19
1/2
17
2.0
12
8
14x1.5
14
19
2.0
12
1/4-19
1/2
19
2.0
12
10
16x1.5
16
21
2.5
12
3/8-19
21/32
21
2.5
12
12
18x1.5
18
23
2.5
12
3/8-19
21/32
23
2.5
12
14
20x1.5
20
25
3.0
14
1/2-14
13/16
25
3.0
14
16
22x1.5
22
27
3.0
14
1/2-14
13/16
27
3.0
14
20
27x2
27
32
3.0
16
3/4-14
11/32
32
3.0
16
25
33x2
33
39
3.0
18
1-11
15/16
39
3.0
18
30
42x2
42
49
3.0
20
11/4-11
121/32
49
3.0
20
38
48x2
48
55
3.0
22
11/2-11
17/8
55
3.0
22

Female Types A & B, Din 3852
Female Metric Thread Parallel
DIN 3852 Type A & B
Sheet 1
Female Metric Thread Parallel
DIN 3852 Type A & B
Sheet 2
Metric
Thread
Size
Thread
O.D.
mm
A
mm
B
mm
Whitworth
Thread
Size
Thread
O.D.
in
A
mm
B
mm
10x1
8.5
15
1.0
1/8-28
11/32
15
1.0
12x1.5
10.5
18
1.5
1/4-19
15/32
19
1.5
14x1.5
12.5
20
1.5
1/4-19
15/32
19
1.5
16x1.5
14.5
22
1.5
3/8-19
19/32
23
2.0
18x1.5
16.5
24
2.0
1/2-14
3/4
27
2.5
22x1.5
20.5
28
2.5
1/2-14
3/4
27
2.5
26x1.5
24.5
32
2.5
3/4-14
31/32
33
2.5
33x2
31.5
40
2.5
1-11
17/32
40
2.5
42x2
40.5
50
2.5
11/4-11
117/32
50
2.5
48x2
46.5
56
2.5
11/2-11
125/32
56
2.5
12x1.5
10.5
18
1.5
1/4-19
15/32
19
1.5
14x1.5
12.5
20
1.5
1/4-19
15/32
19
1.5
16x1.5
14.5
22
1.5
3/8-19
19/32
23
2.0
18x1.5
16.5
24
2.0
3/8-19
19/32
23
2.0
20x1.5
18.5
26
2.0
1/2-14
3/4
27
2.5
22x1.5
20.5
28
2.5
1/2-14
3/4
27
2.5
27x2
25.5
33
2.5
3/4-14
31/32
33
2.5
33x2
31.5
40
2.5
1-11
17/32
40
2.5
42x2
40.5
50
2.5
11/4-11
117/32
50
2.5
48x2
46.5
56
2.5
11/2-11
125/32
56
2.5

 

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DIN 3852 Type C Sheets 1 & 2 Metric and Whitworth Tapered Thread Connectors

The DIN 3852 Type C couplings are available with either metric or Whitworth British thread. The male will mate only with the female as shown.

The male and female couplings have tapered threads. Sheet 1 refers to tapered metric threads, and Sheet 2 refers to tapered Whitworth threads. The seal takes place on the threads.

There are three series of DIN 3852 Type C couplings: extra light (LL), light (L) and heavy (S).

DIN 3852 Type C
DIN 3852 Type C Sheets 1 & 2 Metric and Whitworth Tapered Thread Connectors

Series
Tube
O.D.
mm
Male DIN 3852
Type C, Sheet 1
Metric Tapered Threads
Male DIN 3852
Type C, Sheet 2
Whitworth Tapered Threads
Metric
Thread
Size
A
mm
B
mm
Thread
O.D.
mm
Whitworth
Thread
Size
A
in
B
mm
Thread
O.D.
in
LL
Extra
Light
4
8x1
8.40
8
8
1/8-28
.392
8
1/8
5
8x1
8.40
8
8
1/8-28
.392
8
1/8
6
10x1
10.40
8
10
1/8-28
.392
8
1/8
8
10x1
10.40
8
10
1/8-28
.392
8
1/8
L
Light
6
10x1
10.40
8
10
1/8-28
.392
8
1/8
8
12x1.5
12.53
12
12
1/4-19
.532
12
1/4
10
14x1.5
14.53
12
14
1/4-19
.532
12
1/4
12
16x1.5
16.53
12
16
3/8-19
.670
12
3/8
15
18x1.5
18.53
12
18
1/2-14
.839
14
1/2
18
22x1.5
22.65
14
22
1/2-14
.839
14
1/2
S
Heavy
6
12x1.5
12.53
12
12
1/4-19
.532
12
1/4
8
14x1.5
14.53
12
14
1/4-19
.532
12
1/4
10
16x1.5
16.53
12
16
3/8-19
.670
12
3/8
12
18x1.5
18.53
12
18
3/8-19
.670
12
3/8
14
20x1.5
20.65
14
20
1/2-14
.839
14
1/2
16
22x1.5
22.65
14
22
1/2-14
.839
14
1/2

Female DIN 3852
Type C, Sheet 1
Metric Tapered Threads
Female DIN 3852
Type C, Sheet 2
Whitworth Tapered Threads
Metric
Thread
Size
Thread
I.D.
mm
A
mm
Whitworth
Thread
Size
Thread
I.D.
in
A
mm
8x1
6.5
5.5
1/8-28
11/32
5.5
8x1
6.5
5.5
1/8-28
11/32
5.5
10x1
8.5
5.5
1/8-28
11/32
5.5
10x1
8.5
5.5
1/8-28
11/32
5.5
10x1
8.5
5.5
1/8-28
11/32
5.5
12x1.5
10.5
8.5
1/4-19
15/32
8.5
14x1.5
12.5
8.5
1/4-19
15/32
8.5
16x1.5
14.5
8.5
3/8-19
19/32
8.5
18x1.5
16.5
8.5
1/2-14
3/4
8.5
22x1.5
20.5
10.5
1/2-14
3/4
10.5
12x1.5
10.5
8.5
1/4-19
15/32
8.5
14x1.5
12.5
8.5
1/4-19
15/32
8.5
16x1.5
14.5
8.5
3/8-19
19/32
8.5
18x1.5
16.5
8.5
3/8-19
19/32
8.5
22x1.5
20.5
10.5
1/2-14
3/4
10.5

 

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Metric Standpipe Assembly

A metric standpipe assembly is comprised of three components attached to a male fitting. The components are: a Standpipe, Bite Sleeve and Metric Nut. The nut is placed over the Standpipe, followed by the Bit Sleeve (see illustration below). For DIN light assemblies, a DIN light metric nut is used. For DIN heavy assemblies, a DIN heavy metric nut is used. The Bit Sleeve and Standpipe are selected on the basis of tube O.D. required.

Metric Standpipe Assembly
Metric Standpipe Assembly

Metric Standpipe
DIN Tube O.D.
mm
Bit Sleeve
DIN Tube O.D.
mm
Metric Nut Thread
Light Heavy
6
6
M12x1.5
-
8
8
M14x1.5
M16x1.5
10
10
M16x1.5
M18x1.5
12
12
M18x1.5
M20x1.5
15
15
M22x1.5
-
16
16
-
M24x1.5
18
18
M26x1.5
-
20
20
-
M30x2.0
22
22
M30x2.0
-
25
25
-
M36x2.0
28
28
M36x2.0
-
30
30
-
M42x2.0
35
35
M45x2.0
-
38
38
-
M52x2.0
42 42 M52x2.0 -

 

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