KF Flanges and Fittings

Kaysuns offers a complete line of vacuum KF fittings and flanges. The tube portions are fabricated from 304 or 316L or other high quality stainless steels. kaysuns’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.

• Flanges
• Nipples
• Elbows
• Tees
• Crosses
• Clamps and Seals

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

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Short Weld

Flange Size	Tube Size	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)

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Blank Flange

Flange Size	Tube Size	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)

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Half Nipples

Flange Size	Tube Size	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)

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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)

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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)

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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)

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KF Clamp

Flange Size	Tube Size	Dimensions, 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)

 

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*For more information of kf fittings and flanges, please feel free to contact us.