346
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