KF fittings KF flanges

Guanyu Tube offers a complete line of vacuum KF fittings and KF flanges. The tube portions are fabricated from 304 or 316L or other high quality stainless steels. Guanyu’s elbows, and all tees and crosses are made with the pull port technique. This allows smooth, crevice-free butt welds to provide the maximum in cleanliness for UHV applications. Bakeout range is up to 200°C. Standard finish is bead blasted.

KF Stainless Steel Flanges
KF Stainless Steel Nipples
KF Stainless Steel Elbows
KF Stainless Steel Tees
KF Stainless Steel Crosses
KF Stainless Steel Clamps and Seals

Flange Size	Material	Tube OD	Dimension, in. (mm)	Dimension, in. (mm)	Dimension, in. (mm)	Dimension, in. (mm)
–	–	–	A	B	C	D
NW10	304/316L	1/2″	1.18″ (30.0)	0.48″ (12.2)	0.12″ (3.0)	0.10″ (2.5)
NW16	304/316L	3/4″	1.18″ (30.0)	0.68″ (17.2)	0.12″ (3.0)	0.10″ (2.5)
NW25	304/316L	1″	1.57″ (40.0)	1.03″ (26.2)	0.12″ (3.0)	0.10″ (2.5)
NW40	304/316L	1 1/2″	2.17″ (55.0)	1.62″ (41.2)	0.12″ (3.0)	0.10″ (2.5)
NW50	304/316L	2″	2.95″ (75.0)	2.06″ (52.3)	0.12″ (3.0)	0.10″ (2.5)

Features:

1. Flanges are designed according to ISO2861 specification and can be changed upon request.
2. Flange sizes are from NW10 to NW50
3. Vacuum Range: ≥10-8 Torr
4. Standard materials are 304 and 316L stainless steel.
5. Tube sizes are from 1/2″ to 2″
6. The system can afford up to 400℉ (200 ℃). However, sustained baking above 302℉ (150°C) may result in deterioration of the O-ring.
7. KF products are supplied with a machining finish. Other finishes are also available.
8. Flanges and seals are reusable.
9. No tools for assembly or disassembly.
10. KF flanges are 100% tested before shipping.
11. Seal Temperature Range:
- Fluorocarbon FKM (Viton): -5 ℃ -204 ℃ (23℉ -399℉)
- Silicon: -50℃ ~ 180℃ (-58℉〜356℉)
- Buna-N (NBR): – 25℃ ~ 121℃ (-13℉ ~ 250℉)

Applications:

1. High Vacuum
2. Roughing line
3. Vacuum systems, which require cleaning and modified frequently.
4. Experimental system in research laboratories

1.WING NUT
2.SPRING WASHER
3.EYE BOLT
4.WELD FLANGE
5.CLAMP
6.O-RING
7.CENTER RING

1.SPRING WASHER
2.WING NUT
3.EYE BOLT
4.CLAMP
5.O-RING
6.CENTER RING
7.WELD FLANGE

Short Weld

Flange Size	Tube Size	Dimensions, in. (mm)	Dimensions, in. (mm)
–	–	C	E
NW10	1/2″	0.50″ (12.7)	0.37″ (9.4)
NW16	3/4″	0.50″ (12.7)	0.62″ (15.7)
NW25	1″	0.50″ (12.7)	0.87″ (22.1)
NW40	1 1/2″	0.75″ (19.1)	1.37″ (34.8)
NW50	2″	0.75″ (19.1)	1.87″ (47.5)

Blank Flange

Flange Size	Tube Size	Dimensions, in. (mm)	Dimensions, in. (mm)
–	–	C	D
NW10	1/2″	0.20″ (5.0)	1.18″ (30.0)
NW16	3/4″	0.20″ (5.0)	1.18″ (30.0)
NW25	1″	0.20″ (5.0)	1.57″ (40.0)
NW40	1 1/2″	0.20″ (5.0)	2.17″ (55.0)
NW50	2″	0.20″ (5.0)	2.95″ (75.0)

Half Nipples

Flange Size	Tube Size	Dimensions, in. (mm)	Dimensions, in. (mm)
–	–	C	E
NW10	1/2″	1.25″ (31.8)	0.37″ (9.4)
NW16	3/4″	1.15″ (29.2)	0.62″ (15.7)
NW25	1″	2.03″ (51.6)	0.87″ (22.1)
NW40	1 1/2″	2.40″ (61.0)	1.37″ (34.8)
NW50	2″	3.15″ (80.0)	1.87″ (47.5)

Reducing

Flange Size	Tube Size	C, in. (mm)
NW25×NW16	3/4″	1.30″ (33.0)
NW40×NW16	3/4″	1.30″ (33.0)
NW40×NW25	1″	2.18″ (55.4)
NW50×NW16	3/4″	1.30″ (33.0)
NW50×NW25	1 1/2″	2.18″ (55.4)
NW50×NW40	2″	2.55″ (64.8)

90° Elbow

Flange Size	Tube Size	A, in. (mm)
NW10	1/2″	1.25″ (31.8)
NW16	3/4″	1.15″ (29.2)
NW25	1″	1.65″ (41.9)
NW40	1 1/2″	2.40″ (61.0)
NW50	2″	3.15″ (80.0)

Equal Tee

Flange Size	Tube Size	A, in. (mm)
NW10	1/2″	1.25″ (31.8)
NW16	3/4″	1.15″ (29.2)
NW25	1″	2.03″ (51.6)
NW40	1 1/2″	2.40″ (61.0)
NW50	2″	3.15″ (80.0)

KF Clamp

Flange Size	Tube Size	Dimension, in. (mm)	Dimension, in. (mm)	Dimension, in. (mm)
–	–	A	B	C
NW10/NW16	1/2″ or 3/4″	1.69″ (42.9)	2.47″ (62.8)	0.63″ (16.0)
NW25	1″	2.17″ (55.1)	2.82″ (71.6)	0.63″ (16.0)
NW40	1 1/2″	2.76″ (70.1)	3.54″ (89.8)	0.63″ (16.0)
NW50	2″	3.70″ (94.0)	4.43″ (112.5)	0.79″ (20.1)