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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.
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Mating Flange Side |
Smaller Flange Side |
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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 Factory |
| 275 x 133 |
2.75" |
1.33" |
0.62" |
8-32 |
.500" |
.5 |
Contact Factory |
| 275 x 212T* |
2.75" |
2.12" |
1.00" |
.25-28 |
.500" |
.5 |
Contact Factory |
| 338 x 133 |
3.37" |
1.33" |
0.62" |
8-32 |
.620" |
2.0 |
Contact Factory |
| 338 x 212 |
3.37" |
2.12" |
1.00" |
.25-28 |
.620" |
2.0 |
Contact Factory |
| 338 x 275T* |
3.37" |
2.75" |
1.50" |
.25-28 |
.620" |
1.5 |
Contact Factory |
| 450 x 133 |
4.50" |
1.33" |
0.62" |
8-32 |
.680" |
3.5 |
Contact Factory |
| 450 x 212 |
4.50" |
2.12" |
1.00" |
.25-28 |
.680" |
3.5 |
Contact Factory |
| 450 x 275 |
4.50" |
2.75" |
1.50" |
.25-28 |
.680" |
3.0 |
Contact Factory |
| 450 x 338T* |
4.50" |
3.37" |
2.00" |
.31-24 |
.680" |
3.0 |
Contact Factory |
| 462 x 133 |
4.62" |
1.33" |
0.62" |
8-32 |
.750" |
4.0 |
Contact Factory |
| 462 x 212 |
4.62" |
2.12" |
1.00" |
.25-28 |
.750" |
4.0 |
Contact Factory |
| 462 x 275 |
4.62" |
2.75" |
1.50" |
.25-28 |
.750" |
4.0 |
Contact Factory |
| 462 x 338 |
4.62" |
3.37" |
2.00" |
.31-24 |
.750" |
3.5 |
Contact Factory |
| 600 x 133 |
6.00" |
1.33" |
0.62" |
8 -32 |
.780" |
6.5 |
Contact Factory |
| 600 x 212 |
6.00" |
2.12" |
1.00" |
.25-28 |
.780" |
6.5 |
Contact Factory |
| 600 x 275 |
6.00" |
2.75" |
1.50" |
.25-28 |
.780" |
6.5 |
Contact Factory |
| 600 x 338 |
6.00" |
3.37" |
2.00" |
.31-24 |
.780" |
6.0 |
Contact Factory |
| 600 x 450 |
6.00" |
4.50" |
2.50" |
.31-24 |
.780" |
6.0 |
Contact Factory |
| 600 x 462 |
6.00" |
4.62" |
3.00" |
.31-24 |
.780" |
5.5 |
Contact Factory |
| 675 x 133 |
6.75" |
1.33" |
0.62" |
8-32 |
.840" |
7.0 |
Contact Factory |
| 675 x 212 |
6.75" |
2.12" |
1.00" |
.25-28 |
.840" |
7.0 |
Contact Factory |
| 675 x 275 |
6.75" |
2.75" |
1.50" |
.25-28 |
.840" |
7.0 |
Contact Factory |
| 675 x 338 |
6.75" |
3.37" |
2.00" |
.31-24 |
.840" |
6.5 |
Contact Factory |
| 675 x 450 |
6.75" |
4.50" |
2.50" |
.31-24 |
.840" |
6.5 |
Contact Factory |
| 675 x 462 |
6.75" |
4.62" |
3.00" |
.31-24 |
.840" |
6.0 |
Contact Factory |
| 675 x 600T* |
6.75" |
6.00" |
4.00" |
.31-24 |
.840" |
5.5 |
Contact Factory |
| 800 x 133 |
8.00" |
1.33" |
0.62" |
8-32 |
0.880" |
12.0 |
Contact Factory |
| 800 x 212 |
8.00" |
2.12" |
1.00" |
.25-28 |
0.880" |
12.0 |
Contact Factory |
| 800 x 275 |
8.00" |
2.75" |
1.50" |
.25-28 |
0.880" |
11.5 |
Contact Factory |
| 800 x 338 |
8.00" |
3.37" |
2.00" |
.31-24 |
0.880" |
11.5 |
Contact Factory |
| 800 x 450 |
8.00" |
4.50" |
2.50" |
.31-24 |
0.880" |
11.0 |
Contact Factory |
| 800 x 462 |
8.00" |
4.62" |
3.00" |
.31-24 |
0.880" |
11.0 |
Contact Factory |
| 800 x 600 |
8.00" |
6.00" |
4.00" |
.31-24 |
0.880" |
10.5 |
Contact Factory |
| 800 x 675T* |
8.00 |
6.75" |
5.00" |
.31-24" |
0.880 |
10.5" |
Contact Factory |
| 1000 x 133 |
10.00" |
1.33" |
0.62" |
8-32 |
0.970" |
22.0 |
Contact Factory |
| 1000 x 212 |
10.00" |
2.12" |
1.00" |
.25-28 |
0.970" |
22.0 |
Contact Factory |
| 1000 x 275 |
10.00" |
2.75" |
1.50" |
.25-28 |
0.970" |
22.0 |
Contact Factory |
| 1000 x 338 |
10.00" |
3.37" |
2.00" |
.31-24 |
0.970" |
21.0 |
Contact Factory |
| 1000 x 450 |
10.00" |
4.50" |
2.50" |
.31-24 |
0.970" |
20.0 |
Contact Factory |
| 1000 x 462 |
10.00" |
4.62" |
3.00" |
.31-24 |
0.970" |
20.0 |
Contact Factory |
| 1000 x 600 |
10.00" |
6.00" |
4.00" |
.31-24 |
0.970" |
19.0 |
Contact Factory |
| 1000 x 675 |
10.00" |
6.75" |
5.00" |
.31-24 |
0.970" |
18.0 |
Contact Factory |
| 1000 x 800 |
10.00" |
8.00" |
6.00" |
.31-24 |
0.970" |
18.0 |
Contact Factory |
| 1325 x 133 |
13.25" |
1.33" |
0.62" |
8-32 |
1.120" |
41.0 |
Contact Factory |
| 1325 x 212 |
13.25" |
2.12" |
1.00" |
.25-28 |
1.120" |
41.0 |
Contact Factory |
| 1325 x 275 |
13.25" |
2.75" |
1.50" |
.25-28 |
1.120" |
41.0 |
Contact Factory |
| 1325 x 338 |
13.25" |
3.37" |
2.00" |
.31-24 |
1.120" |
40.0 |
Contact Factory |
| 1325 x 450 |
13.25" |
4.50" |
2.50" |
.31-24 |
1.120" |
39.0 |
Contact Factory |
| 1325 x 462 |
13.25" |
4.62" |
3.00" |
.31-24 |
1.120" |
39.0 |
Contact Factory |
| 1325 x 600 |
13.25" |
6.00" |
4.00" |
.31-24 |
1.120" |
37.0 |
Contact Factory |
| 1325 x 675 |
13.25" |
6.75" |
5.00" |
.31-24 |
1.120" |
37.0 |
Contact Factory |
| 1325 x 800 |
13.25" |
8.00" |
6.00" |
.31-24 |
1.120" |
34.0 |
Contact Factory |
| 1325 x 1000 |
13.25" |
10.00" |
8.00" |
.31-24 |
1.120" |
30.0 |
Contact Factory |
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