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Appendix
Appendix
Installation & Maintenance
Assemblies
Equipment & Accessories
Fittings
Hoses
Fitting Identification
Fitting Standards
DIN 20066 4–Bolt Flange
Flange Head
4-
Bolt Split Flange
Identification
The female port is an unthreaded hole surrounded with
4
bolt holes in a rectangular pattern. The male consists
of a flanged head, grooved for an O-ring, and a flange
with holes to match the port.
Seal
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 mechanically.
Comments
There are two pressure ratings. Form R is similar to SAE
Code 61 and is referred to as the “standard” series. Form
S is similar to SAE Code 62 and is referred to as the
“
heavy duty” series. The design concept is the same, but
bolt diameters and flange head diameters are larger for
the Form S fitting. Both metric and inch bolts are used.
DIN 20066 is interchangeable with both SAE J518 and
JIS B 8363.
Nominal
Flange Size
FormR
in.
Flange OD A
B
C
1/2
1.188
0.688
1.500
0.265
5/8
1.345
0.265
3/4
1.500 0.875
1.875
0.265
1
1.750 1.031
2.062
0.315
1
e
2.000 1.188
2.312
0.315
1
f
2.375 1.406
2.750
0.315
2
2.812 1.688
3.062
0.375
2
f
3.312 2.000
3.500
0.375
3
4.000 2.438
4.188
0.375
3
f
4.500 2.750
4.750
0.422
4
5.000 3.062
5.125
0.442
5
6.000 3.625
6.000
0.442
Nominal
Flange Size
Form S
in.
Flange OD A
B
C
1/2
1.250 0.718
1.594
0.305
3/4
1.625 0.937
2.000
0.345
1
1.875 1.093
2.250
0.375
1
e
2.125
1.250
2.625
0.405
1
f
2.500 1.437
3.125
0.495
2
3.125
1.750
3.812
0.495
Thread Identification Table
DIN 2066 4-Bolt Flange