Buna-N O-Ring
• 100°C Maximum

Change Your Flange Size With One Centering Ring!

The use of Adapter Centering Rings is simple:
One side of the ring is NW20 and the other NW25.
By using this centering, you CONVERT a
NW20 flange size to a NW25 Flange

NW, KF, QF Series High Vacuum Flanges

NW20 (KF20) OD: 1.57" – Centering Ring Counter Bore: 0.86"

NW25 (KF25) OD: 1.57" – Centering Ring Counter Bore: 1.03"

NW20 Flanges Are Sometimes Used Overseas (Uncommon)

NW20-25-AAR-B Compare to: QF20-25-AARB 100315803

Aluminum Adaptive Centering Ring
NW20 to NW25
(NW20-25-AAR-B)
NW20-25-AAR-B$8.50