Click to enlargeNW20 To NW25
Adaptive Centering Ring
Viton O-Ring

NW25xNW20 Aluminum Adaptive Centering Ring
Viton O'Ring

• NW20 to NW25 (KF20 to KF25)
• Centering Ring Reducing
• NW20xNW25 High Vacuum Hardware

Viton® O-Ring
• Viton (Fluorocarbon FKM)
• 200°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 (KF20) vacuum flange size is not popular in the US,
but may be necessary to use US flanges.

NW20-25-AAR-V Compare to: KCA2025AV 100315813 QF20-25-AARV

Aluminum Adaptive Centering Ring
NW20 to NW25

NW20-25-AAR-VPrice: $10.00Sale: $8.50

Click to enlarge
Click to enlarge
Uses NW25 Series

Uses NW25 Series

Click to enlarge
All NW20 to NW25
Adaptive Rings

Contact LDS Vacuum with any questions:
Phone (407)862-4643 via Fax (407)862-8723 or

LDS Vacuum Products is a 100% woman owned company and
certified Woman Owned Small Business (WOSB)
The logos and/or trademarks appearing on this page are not owned by or registered to LDS but, rather, designate products sold by LDS, and are owned and/or registered to the manufacturers or suppliers of the products.
Viton® is a registered trademark of DuPont Dow Elastomers
Images Shown May Be For Reference Only