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German connections
Metric (German) connections
Metric (German) connections
DIN 20066 4-bolt flange*
This connection is commonly
used in fluid power systems.
There are two pressure ratings.
Form R (Code 61) is referred to
as the “standard duty” series and
Form S (Code 62) is the “heavy
duty” series. The design concept
for both series is the same, but
the bolt hole spacing and flanged
head diameters are larger for
the higher pressure, Form S
connection. Both metric and
inch bolts are used. The female
(port) is an unthreaded hole with
four bolt holes in a rectangular
pattern around the port. The
male consists of a flanged head,
Size
mm
(inch)
(dash)
Port
hole
grooved for an O-Ring, and either
a captive flange or split flange
halves with bolt holes to match
the port. The seal takes place on
the O-Ring, which is compressed
between the flanged head and
the flat surface surrounding the
port.The threaded bolts hold the
connection together.
NOTE: *DIN 20066, IS/DIS 6166, JIS B 8363 and
SAE J518 are interchangeable, except for bolt
sizes.
Bolt dimensions
Form S
(Cd. 62)
Form R
(Cd. 61)
Form S
(Cd. 62)
mm
(in)
-
-
mm (in)
mm (in)
12 (1/2)
(08)
12,7
(0.50)
M8 x 1.25x 30
5/16–18 x 1 1/4
M8 x 1.25 x 30
5/16–18 x 1 1/4
38.1
(1.50)
40.5
(1.57)
20 (3/4)
(12)
19,1
(0.75)
M10 x 1.5 x 30
3/8–16 x 1 1/4
M10 x 1.5 x 40
3/8–16 x 1 1/2
47.6
(1.88)
50.8
(2.00)
25 (1)
(16)
25,4
(1.00)
M10 x 1.5 x 35
3/8–16 x 1 1/4
M12 x 1.75 x 45
7/16–14 x
1 3/4
52.4
(2.06)
57.2
(2.25)
32 (1-1/4) 31,7
(20)
(1.25)
M10 x 1.75 x 40
7/16–14 x 1 1/2
M14 x 2 x 45
1/2–13 x 1 3/4
58.7
(2.31)
66.7
(2.63)
40 (1-1/2) 38,0
(24)
(1.50)
M12 x 1.75 x 40
1/2–13 x 1 1/2
M16 x 2 x 55
5/8–11 x 2 1/4
69.9
(2.75)
79.4
(3.13)
50 (2)
(32)
M12 x 1.75 x 40
1/2–13 x 1 1/2
M20 x 2.5 x 70
3/4–10 x 2 3/4
77.8
(3.06)
96.8
(3.81)
320
Flanged head dia. “K”
Form R
(Cd. 61)
Form S
(Cd. 62)
mm
in
mm
in
30.2
1.19
31.8
1.25
3/4
38.1
1.50
41.3
1.63
1
44.5
1.75
47.6
1.88
1/2
1 1/4
50.8
2.00
54.0
2.13
1 1/2
60.3
2.38
63.5
2.50
2
71.4
2.81
79.4
3.13
Bolt hole spacing
Form R.
(Cd. 61)
50,8
(2.00)
Inch
size
K
A
Port
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