Click to enlargeNW40 Mesh Screen Centering Rings

NW40 Mesh Screen Centering Rings
• NW40 (KF40, QF40) Series
• Centering Ring Assembly with Screen
• 304 Stainless

NW (KF, QF) O-Ring
• Buna-N (Nitrile NBR): 100°C Maximum
• Viton (Fluorocarbon, FKM): 200°C Maximum
• Silicone (Chemical Series): 200°C Maximum

NW40 Series Equivalent Names:
• KF40, KF-40, NW-40, QF40, Kwik Flange

NW, KF, QF Series High Vacuum Flanges

NW40 (KF40) OD: 2.18" – Centering Ring Counter Bore: 1.62"





NW40 Mesh Screen Ring Viton O-Ring <BR> NW40-150-SRV-SM
NW40 Mesh Screen Ring Buna O-Ring <br> (NW40-150-SRB-SM)
NW40 Mesh Screen Ring Viton O-Ring
NW40-150-SRV-SM

Price: $59.27
Sale: $31.00
NW40 Mesh Screen Ring Buna O-Ring
(NW40-150-SRB-SM)

Price: $59.27
50 YEAR SALE: $15.50
NW40 Mesh Screen Ring Silicone O-Ring <BR> (NW40-150-SRS-SM)
NW40 Centering Ring Sintered Metal Filter <br> (NW40-SMF)
NW40 Mesh Screen Ring Silicone O-Ring
(NW40-150-SRS-SM)

Price: $59.27
Sale: $33.00
NW40 Centering Ring Sintered Metal Filter
(NW40-SMF)

Price: $133.75
Sale: $78.00
Click to enlarge
Click to enlarge
NW40 O-Rings (All)

All NW40 Hardware


Viton® (Fluorocarbon, FKM) O-Ring:
200°C Maximum
• Viton® (Fluorocarbon, FKM) is normally used in vacuum service. Viton® has a low porosity to most gases and withstands high temperatures up to 200°C for short periods.

Silicone O-Rings:
200°C Maximum, Chemical Applications
• Silicone is used in chemical applications and can withstand temperatures of 200°C for short periods, but silicone tends to harden to prolonged high temperature service, sticking to the metal surfaces and making the o-ring difficult to be replaced. Silicone is also very porous to helium.

Buna-N (Nitrile NBR) O-Rings:
100°C Maximum
Also Known As Nitrile (NBR)

• Buna-N is low cost, but their maximum operating temperature of 100°C makes them unacceptable for many high temperature vacuum applications.

Contact LDS Vacuum with any questions:
Phone (407)862-4643 via Fax (407)862-8723 or
info@ldsvacuum.com

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