KF (QF) Flanges Overview
The KF (QF) flange is designed for through- or foreline vacuum plumbing and serves as a connection for simple high-vacuum (HV) chamber ports.
Design and Material
These flanges feature a sexless design and are constructed from three main materials: 304L stainless steel, aluminum, or brass. Stainless steel flanges are particularly suited for extreme temperatures and corrosive environments, while aluminum and brass fittings are ideal for more general applications.
Sealing Mechanism
The vacuum seal is achieved through a rubber or elastomeric o-ring, which is securely mounted in a centering ring. This configuration not only aligns the flanges but also holds the o-ring firmly in place. Each flange is designed with a chamfered back surface, ensuring a snug fit when mated together.
Assembly
Mating the flanges is accomplished using a circumferential clamp, which can be tightened via a wing-nut, thumbscrew, bolt, or over-center lever.
Application Limits
KF flanges are limited by the o-ring’s material properties, typically functioning within a temperature range of approximately 0° C to 120–180° C. They can handle pressures from atmospheric levels down to about 10^-8 torr or mbar.
Ordering Table
| Flange Size/OD | Type | Flange Material | Drawing | Part Number |
| KF10 (1.18" OD) | Bored | 304L SS |
| QF10-025-SBB |
| KF10 (1.18" OD) | Bored | 304L SS |
| QF10-050-SBB |
| KF16 (1.18" OD) | Bored | 304L SS |
| QF16-025-SBB |
| KF16 (1.18" OD) | Bored | 304L SS |
| QF16-037-SBB |
| KF16 (1.18" OD) | Bored | 304L SS |
| QF16-050-SBB |
| KF16 (1.18" OD) | Bored | 304L SS |
| QF16-075-SBB |
| KF25 (1.57" OD) | Bored | 304L SS |
| QF25-025-SBB |
| KF25 (1.57" OD) | Bored | 304L SS |
| QF25-037-SBB |
| KF25 (1.57" OD) | Bored | 304L SS |
| QF25-050-SBB |
| KF25 (1.57" OD) | Bored | 304L SS |
| QF25-075-SBB |
| KF25 (1.57" OD) | Bored | 304L SS |
| QF25-100-SBB |
| KF40 (2.16" OD) | Bored | 304L SS |
| QF40-025-SBB |
| KF40 (2.16" OD) | Bored | 304L SS |
| QF40-037-SBB |
| KF40 (2.16" OD) | Bored | 304L SS |
| QF40-050-SBB |
| KF40 (2.16" OD) | Bored | 304L SS |
| QF40-075-SBB |
| KF40 (2.16" OD) | Bored | 304L SS |
| QF40-100-SBB |
| KF40 (2.16" OD) | Bored | 304L SS |
| QF40-150-SBB |
| KF50 (2.95" OD) | Bored | 304L SS |
| QF50-025-SBB |
| KF50 (2.95" OD) | Bored | 304L SS |
| QF50-050-SBB |
| KF50 (2.95" OD) | Bored | 304L SS |
| QF50-075-SBB |
| KF50 (2.95" OD) | Bored | 304L SS |
| QF50-100-SBB |
| KF50 (2.95" OD) | Bored | 304L SS |
| QF50-150-SBB |
| KF50 (2.95" OD) | Bored | 304L SS |
| QF50-200-SBB |
Accessories Table
| Description | For | Per Package | Part Number | Price |
| Cast Clamps (SS) | KF10, KF16 Flanges | 1 | QF16-075-CS | $62.25 |
| Cast Clamps (SS) | KF25 Flanges | 1 | QF25-100-CS | $68.85 |
| Cast Clamps (SS) | KF40 Flanges | 1 | QF40-150-CS | $75.00 |
| Cast Clamps (SS) | KF50 Flanges | 1 | QF50-200-CS | $90.00 |
| Cast Clamps (Aluminum) | KF10, KF16 Flanges | 1 | QF16-075-C | $6.95 |
| Cast Clamps (Aluminum) | KF25 Flanges | 1 | QF25-100-C | $8.80 |
| Cast Clamps (Aluminum) | KF40 Flanges | 1 | QF40-150-C | $10.15 |
| Cast Clamps (Aluminum) | KF50 Flanges | 1 | QF50-200-C | $16.60 |
| Lever Clamps (Aluminum) | KF10, KF16 Flanges | 1 | QF16-075-CHA | $52.85 |
| Lever Clamps (Aluminum) | KF25 Flanges | 1 | QF25-100-CHA | $75.00 |
| Lever Clamps (Aluminum) | KF40 Flanges | 1 | QF40-150-CHA | $87.65 |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF10 Flanges | 1 | QF10-050-SRV | $7.75 |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF16 Flanges | 1 | QF16-075-SRV | $8.55 |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF25 Flanges | 1 | QF25-100-SRV | $11.25 |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF40 Flanges | 1 | QF40-150-SRV | $13.50 |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF50 Flanges | 1 | QF50-200-SRV | $19.50 |
| Description | For | Per Package | Part Number | Price |
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