Weld KF (QF) Stubs (304L SS)
he KF (QF) flange is used for through- or foreline vacuum plumbing and for simple HV chamber ports.
KF flanges are a sexless design—made from 304L stainless, aluminum, or brass. Stainless steel flanges work in adverse temperatures and corrosive conditions, while aluminum or brass fittings work in more general applications. The seal is a rubber/ elastomeric o-ring mounted in a centering ring, which aligns the flanges and holds the o-ring in position. Each flange has a chamfered back-surface and is mated by a circumferential clamp tightened by wing-nut, thumbscrew, bolt, or over-center lever.
KF flanges are limited (by the o-ring's properties) to applications with temperatures between ~0° C and 120–180° C, and pressure from atmosphere to ~10-8 torr or mbar.
NOTE: These flanges are identical to the ISO NW flange standard. While these flanges are compatible with those made by European manufacturers, the tube diameter listed is in inches.
Flange
Size | Dim
A | Dim
B | Dim
C | Nominal
Tube O.D. | Weight
lbs (kg) | PartNo | Price | | |
| KF10 |
0.50" |
0.375" |
0.50" |
1/2" |
1/4 (0.11) |
QF10-050-SS |
$9.80 |
|
|
| KF16 |
0.50" |
0.375" |
0.50" |
1/2" |
1/4 (0.11) |
QF16-050-SS |
$10.30 |
|
|
| KF16 |
0.75" |
0.625" |
0.50" |
1-3/4" |
1/4 (0.11) |
QF16-075-SS |
$9.30 |
|
|
| KF25 |
1.00" |
0.875" |
0.50" |
1" |
1/4 (0.11) |
QF25-100-SS |
$10.30 |
|
|
| KF40 |
1.50" |
1.335" |
0.75" |
1-1/2" |
1/4 (0.11) |
QF40-150-SS |
$13.40 |
|
|
| KF40 |
1.50" |
1.37" |
0.75" |
1-1/2" |
1/4 (0.11) |
QF40-150-SST |
$13.40 |
|
|
| KF50 |
2.00" |
1.835" |
0.75" |
2" |
1/4 (0.11) |
QF50-200-SS |
$19.60 |
|
|
| KF50 |
2.00" |
1.87" |
0.75" |
2" |
1/4 (0.11) |
QF50-200-SST |
$19.60 |
|
|
|
