KF O-Rings and Other Solutions
Explore Our Full Line of KF O-Rings for Vacuum Fitting Performance
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O-Ring KF Centering Rings, KF Fittings, NW Centering Ring, ISO Centering Ring
| Centering Ring Fitting Size | Centering Ring O-Ring Size USA | Centering Ring O-Ring Metric Alternative | |||||
| NW | KF | ISO2861-1 | AS568 USA Size | Cross Section mm (in) | Inside Diameter mm (in) | Cross Section mm (in) | Inside Diameter mm (in) |
|---|---|---|---|---|---|---|---|
| NW10 | KF10 | ISO10 | -312 | 5.33 (0.210) | 15.00 (0.600) | 5.00 (0.197) | 15.00 (0.600) |
| NW16 | KF16 | ISO16 | -314 | 5.33 (0.210) | 18.42 (0.725) | 5.00 (0.197) | 18.00 (0.706) |
| NW25 | KF25 | ISO25 | -320 | 5.33 (0.210) | 27.94 (1.100) | 5.00 (0.197) | 28.00 (1.102) |
| NW40 | KF40 | ISO40 | -326 | 5.33 (0.210) | 40.64 (1.600) | 5.00 (0.197) | 42.00 (1.653) |
| NW50 | KF50 | -330 | 5.33 (0.210) | 53.34 (2.100) | 5.00 (0.197) | 55.00 (2.165) | |
| NW63 | KF63 | -336 | 5.33 (0.210) | 72.39 (2.850) | 5.00 (0.197) | 75.57 (2.975) | |
| NW80 | KF80 | -340 | 5.33 (0.210) | 85.09 (3.350) | 5.00 (0.197) | 88.27 (3.475) | |
| NW100 | KF100 | -346 | 5.33 (0.210) | 104.14 (4.100) | 5.00 (0.197) | 107.32 (4.225) | |
| NW160 | KF160 | -361 | 5.33 (0.210) | 151.76 (5.975) | 5.00 (0.197) | 158.12 (6.225) | |
Centering Ring USA or Metric O-Ring sizes can be used effectively depending on the application and gland design
| O-Ring Material | Description | Relative Cost | Typical Delivery |
|---|---|---|---|
Viton® (FKM) | Low permeation and high temperature resistance makes this compound ideal for vacuum applications for temperatures up to 400° F. |  | 1 to 4 Weeks |
| Silicone | Good chemical resistance low and high temperature capabilities for temperatures up to 400° F. |  | 1 to 4 Weeks |
Markez® (FFKM) | Excellent chemical compatibility and high temperature resistance up to 615° F. |  | 1 to 4 Weeks |
Many other elastomeric compounds are available.
| Centering Ring Material | Relative Cost | Typical Delivery |
|---|---|---|
| Aluminum 6061 | | 1 to 4 Weeks |
| Stainless Steel | | 1 to 4 Weeks |
| PTFE |  | 1 to 4 Weeks |
