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September 2010



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Reducing Flanges

Reducing flanges, also known as adapter flanges, offer the simplest and least expensive method of mating two different sized flanges. Details of various size combinations are machined on opposite sides of reducing flanges. To connect two sizes, the appropriate reducing flange is inserted between the two and bolted into place. Conductance and pumping speed remain virtually unchanged.

Custom sizes and geometries are available.

Mating Flange Side Smaller Flange Side Ordering Information
Model No. Nom. Size Nom. Size I.D. Thread Thickness Ship Wt.
(lbs.)
Price
212 x 133T*
2.12"
1.33"
0.62"
8-32
.470"
.5
Contact
275 x 133
2.75"
1.33"
0.62"
8-32
.500"
.5
Contact
275 x 212T*
2.75"
2.12"
1.00"
.25-28
.500"
.5
Contact
338 x 133
3.37"
1.33"
0.62"
8-32
.620"
2.0
Contact
338 x 212
3.37"
2.12"
1.00"
.25-28
.620"
2.0
Contact
338 x 275T*
3.37"
2.75"
1.50"
.25-28
.620"
1.5
Contact
450 x 133
4.50"
1.33"
0.62"
8-32
.680"
3.5
Contact
450 x 212
4.50"
2.12"
1.00"
.25-28
.680"
3.5
Contact
450 x 275
4.50"
2.75"
1.50"
.25-28
.680"
3.0
Contact
450 x 338T*
4.50"
3.37"
2.00"
.31-24
.680"
3.0
Contact
462 x 133
4.62"
1.33"
0.62"
8-32
.750"
4.0
Contact
462 x 212
4.62"
2.12"
1.00"
.25-28
.750"
4.0
Contact
462 x 275
4.62"
2.75"
1.50"
.25-28
.750"
4.0
Contact
462 x 338
4.62"
3.37"
2.00"
.31-24
.750"
3.5
Contact
600 x 133
6.00"
1.33"
0.62"
8 -32
.780"
6.5
Contact
600 x 212
6.00"
2.12"
1.00"
.25-28
.780"
6.5
Contact
600 x 275
6.00"
2.75"
1.50"
.25-28
.780"
6.5
Contact
600 x 338
6.00"
3.37"
2.00"
.31-24
.780"
6.0
Contact
600 x 450
6.00"
4.50"
2.50"
.31-24
.780"
6.0
Contact
600 x 462
6.00"
4.62"
3.00"
.31-24
.780"
5.5
Contact
675 x 133
6.75"
1.33"
0.62"
8-32
.840"
7.0
Contact
675 x 212
6.75"
2.12"
1.00"
.25-28
.840"
7.0
Contact
675 x 275
6.75"
2.75"
1.50"
.25-28
.840"
7.0
Contact
675 x 338
6.75"
3.37"
2.00"
.31-24
.840"
6.5
Contact
675 x 450
6.75"
4.50"
2.50"
.31-24
.840"
6.5
Contact
675 x 462
6.75"
4.62"
3.00"
.31-24
.840"
6.0
Contact
675 x 600T*
6.75"
6.00"
4.00"
.31-24
.840"
5.5
Contact
800 x 133
8.00"
1.33"
0.62"
8-32
0.880"
12.0
Contact
800 x 212
8.00"
2.12"
1.00"
.25-28
0.880"
12.0
Contact
800 x 275
8.00"
2.75"
1.50"
.25-28
0.880"
11.5
Contact
800 x 338
8.00"
3.37"
2.00"
.31-24
0.880"
11.5
Contact
800 x 450
8.00"
4.50"
2.50"
.31-24
0.880"
11.0
Contact
800 x 462
8.00"
4.62"
3.00"
.31-24
0.880"
11.0
Contact
800 x 600
8.00"
6.00"
4.00"
.31-24
0.880"
10.5
Contact
800 x 675T*
8.00
6.75"
5.00"
.31-24"
0.880
10.5"
Contact
1000 x 133
10.00"
1.33"
0.62"
8-32
0.970"
22.0
Contact
1000 x 212
10.00"
2.12"
1.00"
.25-28
0.970"
22.0
Contact
1000 x 275
10.00"
2.75"
1.50"
.25-28
0.970"
22.0
Contact
1000 x 338
10.00"
3.37"
2.00"
.31-24
0.970"
21.0
Contact
1000 x 450
10.00"
4.50"
2.50"
.31-24
0.970"
20.0
Contact
1000 x 462
10.00"
4.62"
3.00"
.31-24
0.970"
20.0
Contact
1000 x 600
10.00"
6.00"
4.00"
.31-24
0.970"
19.0
Contact
1000 x 675
10.00"
6.75"
5.00"
.31-24
0.970"
18.0
Contact
1000 x 800
10.00"
8.00"
6.00"
.31-24
0.970"
18.0
Contact
1325 x 133
13.25"
1.33"
0.62"
8-32
1.120"
41.0
Contact
1325 x 212
13.25"
2.12"
1.00"
.25-28
1.120"
41.0
Contact
1325 x 275
13.25"
2.75"
1.50"
.25-28
1.120"
41.0
Contact
1325 x 338
13.25"
3.37"
2.00"
.31-24
1.120"
40.0
Contact
1325 x 450
13.25"
4.50"
2.50"
.31-24
1.120"
39.0
Contact
1325 x 462
13.25"
4.62"
3.00"
.31-24
1.120"
39.0
Contact
1325 x 600
13.25"
6.00"
4.00"
.31-24
1.120"
37.0
Contact
1325 x 675
13.25"
6.75"
5.00"
.31-24
1.120"
37.0
Contact
1325 x 800
13.25"
8.00"
6.00"
.31-24
1.120"
34.0
Contact
1325 x 1000
13.25"
10.00"
8.00"
.31-24
1.120"
30.0
Contact


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