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 Ebara KF flanges are designed to ISO 2681 specifications for standard USA tube sizes from 3/8 to 2 inches OD. They are compatible with other manufacturers’ ISO-KF style flanges. KF flanges utilize an aluminum clamp with a single wingnut fastener or a lock-over-center clamp allowing frequent disassembly without tools. The vacuum seal is effected by the application of uniform KF Flange General Information Specifications Tube OD sizes: 3/8 to 2 inches Materials Flange: 304 or 316L stainless steel O-rings: Viton, Buna & silicone Fittings Tube finishes: Beadblast standard (Tumbled & electropolish available) Fasteners: Wingnut, SureSeal, bulkhead & EVAC clamps Vacuum range Elastomer seal: >1 x 10-8 Torr -High vacuum EVAC metal seal: >1 x 10-11Torr - UHV Temperature range Viton: -20ºC to 200ºC Silicone: -50º to 230ºC Buna: -30ºC to 110ºC EVAC metal seal: -270˚C to 150˚C New Products Ebara trapped centering rings for KF flanges feature easy assembly with exact centering and are appropriate for vacuum or pressure by externally supporting the sealing ring. Trapped O-rings are intended for use where pressures range from rough vacuum to above atmosphere. Applications include vacuum pump exhaust lines and abatement tools. Trapped Centering Rings Flange O-ring Centering Ring Wingnut Clamp Tube All dimensions are in inches unless otherwise noted pressure from the clamp on the 15º surface of the 304 stainless steel flanges. The mating flange surfaces compress a Viton O-ring held in place by a centering ring. The resultant seal can be used in vacuum applications of up to 10-8 Torr and baked to 204ºC, however sustained baking above 150ºC may result in deterioration of O-rings. Additionally, KF flanges allow components to be rotated before assembly for ease of component alignment. KF flanges are available on virtually all Ebara components and fittings. Ebara manufactures a full line of KF adapters so you can add to or build an entire system with KF components. KF flanges can also be used with EVAC chain clamps and aluminum seals to obtain a UHV seal bakeable to 150ºC.
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Applications: | |
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Specifications: | | SPECIFICATIONS | | Tube OD sizes: 3/8 to 2 inches | Materials
Flange: 304 or 316L stainless steel
O-rings: Viton, Buna & silicone | Fittings
Tube finishes: Beadblast standard
(Tumbled & electropolish available) | | Fasteners: Wingnut, SureSeal, bulkhead & EVAC clamps | Vacuum range
Elastomer seal: >= 1 x 10-8 Torr - High vacuum
EVAC metal seal: >= 1 x 10-11 Torr - UHV | | Vacuum range: >= 1 x 10-11 Torr - UHV | Temperature range:
Viton: -20°C to 200°C
Silicone: -50°C to 230°C
Buna: -30°C to 110°C
EVAC metal seal: -270°C to 150°C |
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KF Bored Blank Flanges: | | MODEL NUMBER | DIAGRAM | TUBE OD | A | B | C | | KF-10B-038 | A | 3/8 | 0.380 | 0.326 | 1.180 | | KF-10B-050 | A | 1/2 | 0.510 | 0.451 | 1.180 | | KF-16B-038 | A | 3/8 | 0.380 | 0.326 | 1.180 | | KF-16B-050 | A | 1/2 | 0.510 | 0.451 | 1.180 | | KF-16B-075 | B | 3/4 | 0.760 | 0.680 | 1.180 | | KF-25B-038 | A | 3/8 | 0.380 | 0.326 | 1.575 | | KF-25B-050 | A | 1/2 | 0.510 | 0.451 | 1.575 | | KF-25B-075 | A | 3/4 | 0.760 | 0.680 | 1.575 | | KF-25B-100 | A | 1 | 1.010 | 0.938 | 1.575 | | KF-40B-038 | A | 3/8 | 0.380 | 0.326 | 2.160 | | KF-40B-050 | A | 1/2 | 0.510 | 0.451 | 2.160 | | KF-40B-075 | A | 3/4 | 0.760 | 0.680 | 2.160 | | KF-40B-100 | A | 1 | 1.010 | 0.938 | 2.160 | | KF-40B-150 | A | 1-1/2 | 1.510 | 1.438 | 2.160 | | KF-50B-038 | A | 3/8 | 0.380 | 0.326 | 2.950 | | KF-50B-050 | A | 1/2 | 0.510 | 0.451 | 2.950 | | KF-50B-075 | A | 3/4 | 0.760 | 0.680 | 2.950 | | KF-50B-100 | A | 1 | 1.010 | 0.938 | 2.950 | | KF-50B-150 | A | 1-1/2 | 1.510 | 1.438 | 2.950 | | KF-50B-200 | A | 2 | 2.010 | 1.938 | 2.950 |
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KF 316L Stainless Steel Bored Blank Flanges: | 
| MODEL NUMBER | DIAGRAM | TUBE OD | A | B | C | | KF-25B-100-316L | A | 1 | 1.010 | 0.938 | 1.575 | | KF-40B-150-316L | A | 1-1/2 | 1.510 | 1.438 | 2.160 | | KF-50B-200-316L | A | 2 | 2.010 | 1.938 | 2.950 |
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KF Socket Weld Flanges: | | MODEL NUMBER | TUBE
OD | A | B | C | D | E | | KF-10-SW | 1/2 | 1.180 | 0.480 | 0.510 | 0.640 | - | | KF-16-SW | 3/4 | 1.180 | 0.680 | 0.760 | 0.798 | - | | KF-25-SW | 1 | 1.575 | 1.031 | 1.010 | 1.140 | 0.938 | | KF-40-SW | 1-1/2 | 2.160 | 1.620 | 1.510 | 1.640 | 1.438 | | KF-50-SW | 2 | 2.950 | 2.060 | 2.010 | 2.140 | 1.938 | |
KF Long Weld Neck Flanges: | | MODEL NUMBER | A | B | C | D | | KF-10FL | 1.180 | 0.480 | 0.380 | 1/2 | | KF-16FL | 1.180 | 0.680 | 0.625 | 3/4 | | KF-25FL | 1.575 | 1.031 | 0.870 | 1 | | KF-40FL | 2.160 | 1.620 | 1.370 | 1-1/2 | | KF-50FL | 2.950 | 2.060 | 1.870 | 2 | |
KF 316L Stainless Steel Long Neck Flanges: | | MODEL NUMBER | A | B | C | D | | KF-25FL-316L | 1.575 | 1.031 | 0.870 | 1 | | KF-40FL-316L | 2.160 | 1.620 | 1.370 | 1-1/2 | | KF-50FL-316L | 2.950 | 2.060 | 1.870 | 2 |
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KF Short Weld Neck Flanges: | | MODEL NUMBER | DIAGRAM | TUBE
OD | A | B | C | D | E | | KF-10F | A | 1/2 | 1.180 | 0.480 | 0.380 | 1/2 | 0.500 | | KF-16F | B | 3/4 | 1.180 | 0.680 | 0.625 | 3/4 | 0.560 | | KF-16FB | A | 3/4 | 1.180 | 0.680 | 0.625 | 3/4 | 0.500 | | KF-25F | A | 1 | 1.575 | 1.031 | 0.870 | 1 | 0.500 | | KF-40F | A | 1-1/2 | 2.160 | 1.620 | 1.370 | 11/2 | 0.750 | | KF-50F | A | 2 | 2.950 | 2.060 | 1.870 | 2 | 0.750 |
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KF Blank Off Caps: |
| MODEL NUMBER | A | B | | KF-10B | 0.200 | 1.180 | | KF-16B | 0.200 | 1.180 | | KF-25B | 0.200 | 1.575 | | KF-40B | 0.200 | 2.160 | | KF-50B | 0.200 | 2.950 |
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KF 316L Blank Off Caps: |
| MODEL NUMBER | A | B | | KF-16B-316L | 0.200 | 1.180 | | KF-25B-316L | 0.200 | 1.575 | | KF-40B-316L | 0.200 | 2.160 | | KF-50B-316L | 0.200 | 2.950 |
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Description: |  Ebara Wing Nut and SureSeal KF Clamps feature special centering ribs and evenly distributed clamping force to assure uniform O-ring compression and reduce the probability of failure under loads. Additional hinge knuckles and tighter manufacturing tolerances result in precise alignment and reduced side play. Clamp opening is limited to facilitate one-handed installation in hard-to-reach spaces. In addition to the above features, the SureSeal clamp provides instant closure with a fixed geometry to attain optimal O-ring compression. All Ebara KF clamps are designed and manufactured to meet Pneurop specifications for ISO-KF 10 through 50 flanges, so you can be confident of universal compatibility. We also provide chain clamps and metal seals for ISO-KF components to transform them from high vacuum to ultra-high vacuum connections. |
KF Wing Nut Clamps: | 
| MODEL NUMBER | A | B | C | | KF-10-CP | 1.690 | 2.392 | 0.625 | | KF-16-CP | 1.690 | 2.392 | 0.625 | | KF-25-CP | 2.140 | 2.796 | 0.625 | | KF-40-CP | 2.750 | 3.437 | 0.625 | | KF-50-CP | 3.500 | 4.245 | 0.710 |
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KF SureSeal Clamps: | 
| MODEL NUMBER | A | B | C | | KF-10-SSC-L | 1.750 | 2.392 | 0.741 | | KF-16-SSC-L | 1.750 | 2.392 | 0.741 | | KF-40-SSC-L | 2.947 | 3.437 | 0.741 | | KF-50-SSC-L | 3.784 | 4.245 | 0.836 |
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KF Bulkhead Clamps: | Bulkhead clamps provide a simple means of fastening an KF flange to a baseplate. Each aluminum clamp is sold with stainless steel socket head cap screws and washers for attachment. Leave 0.075 inch minimum between the bottom of the tapped hole and the inside of the chamber wall.
| MODEL NUMBER | A | B | C | NUMBER OF
SCREWS | THROUGH HOLE
D | | KF-16-BCP | 2.00 | 1.50 | 0.361 | 6 | 0.90 | | KF-25-BCP | 2.37 | 1.89 | 0.387 | 6 | 1.26 | | KF-40-BCP | 2.94 | 2.44 | 0.366 | 6 | 1.84 | | KF-50-BCP | 3.75 | 3.25 | 0.404 | 8 | 2.35 |
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Description: | | Ebara offers aluminum and stainless steel centering rings for KF and ISO flanges. Buna, silicone and Viton O-rings are available for KF, while Buna and Viton are stocked for ISO centering rings. Aluminum ISO centering rings are provided with an aluminum spacer ring. Stainless steel ISO centering rings are also provided with aluminum spacer rings as an option. |
KF Aluminum Centering Rings with O-ring: | 
| MODEL NUMBER | O-RING
MATERIAL | A | B | | KF-10-CR-AV | Viton | 0.478 | 0.456 | | KF-10-CR-AB | Buna | 0.478 | 0.456 | | KF-16-CR-AV | Viton | 0.669 | 0.625 | | KF-16-CR-AB | Buna | 0.669 | 0.625 | | KF-25-CR-AV | Viton | 1.024 | 0.984 | | KF-25-CR-AB | Buna | 1.024 | 0.984 | | KF-40-CR-AV | Viton | 1.614 | 1.570 | | KF-40-CR-AB | Buna | 1.614 | 1.570 | | KF-50-CR-AV | Viton | 2.047 | 1.967 | | KF-50-CR-AB | Buna | 2.047 | 1.967 |
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KF Stainless Steel Centering Ring with O-ring: | 
| MODEL NUMBER | O-RING
MATERIAL | A | B | | KF-10-CR-SV | Viton | 0.478 | 0.456 | | KF-10-CR-SS | Silicone | 0.478 | 0.456 | | KF-10-CR-SB | Buna | 0.478 | 0.456 | | KF-16-CR-SV | Viton | 0.669 | 0.625 | | KF-16-CR-SS | Silicone | 0.669 | 0.625 | | KF-16-CR-SB | Buna | 0.669 | 0.625 | | KF-25-CR-SV | Viton | 1.024 | 0.984 | | KF-25-CR-SS | Silicone | 1.024 | 0.984 | | KF-25-CR-SB | Buna | 1.024 | 0.984 | | KF-40-CR-SV | Viton | 1.614 | 1.570 | | KF-40-CR-SS | Silicone | 1.614 | 1.570 | | KF-40-CR-SB | Buna | 1.614 | 1.570 | | KF-50-CR-SV | Viton | 2.047 | 1.967 | | KF-50-CR-SS | Silicone | 2.047 | 1.967 | | KF-50-CR-SB | Buna | 2.047 | 1.967 |
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KF 316L Stainless Steel Centering Ring with O-ring: | 
| MODEL NUMBER | O-RING
MATERIAL | A | B | | KF-25-CR-SV-316L | Viton | 1.024 | 0.984 | | KF-40-CR-SV-316L | Viton | 1.614 | 1.570 | | KF-50-CR-SV-316L | Viton | 2.047 | 1.967 |
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KF Screened Stainless Steel Centering Ring with Viton O-ring: |
| MODEL NUMBER | O-RING
MATERIAL | A | B | MESH | | KF-25-CR-SV-74 | Viton | 1.024 | 0.984 | 74 | | KF-40-CR-SV-74 | Viton | 1.614 | 1.570 | 74 | | KF-50-CR-SV-74 | Viton | 2.047 | 1.967 | 74 |
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KF Reducer Stainless Steel Centering Ring with Viton O-ring: | 
| MODEL NUMBER | O-RING
MATERIAL | A | B | | KF-10/16-CR | Viton | 0.48 | 0.67 | | KF-20/25-CR | Viton | 0.87 | 1.02 | | KF-32/40-CR | Viton | 1.34 | 1.61 |
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KF Stainless Steel Centering Ring with Viton O-ring and Over Pressure Ring: | 
| MODEL NUMBER | DESCRIPTION | | KF-10-CR-SV-PR | Contains model numbers KF-10-PR and KF-10-CR-SV | | KF-16-CR-SV-PR | Contains model numbers KF-16-PR and KF-16-CR-SV | | KF-25-CR-SV-PR | Contains model numbers KF-25-PR and KF-25-CR-SV | | KF-40-CR-SV-PR | Contains model numbers KF-40-PR and KF-40-CR-SV | | KF-50-CR-SV-PR | Contains model numbers KF-50-PR and KF-50-CR-SV |
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KF Stainless Steel Over Pressure Ring: | 
| MODEL NUMBER | A | B | C | MAXIMUM
PSIG | | KF-10-PR | 1.25 | 1.186 | 0.346 | 100 | | KF-16-PR | 1.25 | 1.186 | 0.346 | 100 | | KF-25-PR | 1.66 | 1.583 | 0.346 | 100 | | KF-40-PR | 2.25 | 2.169 | 0.346 | 75 | | KF-50-PR | 2.75 | 2.620 | 0.145 | 50 |
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KF Trapped Centering Ring with O-ring: | 
| MODEL NUMBER | O-RING
METAL | A | B | C | | KF-10/16-CRT-SV | Viton | 1.18 | 0.63 | 0.91 | | KF-25-CRT-SV | Viton | 1.58 | 0.95 | 1.30 | | KF-40-CRT-SV | Viton | 2.17 | 1.58 | 1.89 | | KF-50-CRT-SV | Viton | 2.95 | 1.97 | 2.32 |
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Description: | | NOTE: Other O-Ring Materials Available upon request |
Viton O-ring: | | MODEL NUMBER | FLANGE
TYPE | | KF-10-OR-V | KF-10 | | KF-16-OR-V | KF-16 | | KF-25-OR-V | KF-25 | | KF-40-OR-V | KF-40 | | KF-50-OR-V | KF-50 |
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Buna O-ring: | | MODEL NUMBER | FLANGE
TYPE | | KF-10-OR-B | KF-10 | | KF-16-OR-B | KF-16 | | KF-25-OR-B | KF-25 | | KF-40-OR-B | KF-40 | | KF-50-OR-B | KF-50 |
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Silicon O-ring: | | MODEL NUMBER | FLANGE
TYPE | | KF-10-OR-S | KF-10 | | KF-16-OR-S | KF-16 | | KF-25-OR-S | KF-25 | | KF-40-OR-S | KF-40 | | KF-50-OR-S | KF-50 |
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Description: | | Ebara manufactures a complete line of KF vacuum fittings. The tube portions are fabricated from 304 stainless steel. 316L stainless steel can be supplied on request. Ebara makes its own elbows, and all tees and crosses are made with the pulled-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. Ebara fittings are also available with CF, ISO and ASA flanges. Standard finish is bead blasted. Electropolished finish can also be provided as an option. Call for pricing. |
KF Half Nipple: |
| MODEL NUMBER | TUBE
OD | A | | 1N-KF-10 | 1/2 | 1.25 | | 1N-KF-16B | 3/4 | 1.15 | | 1N-KF-25B | 1 | 2.03 | | 1N-KF-40B | 1-1/2 | 2.40 | | 1N-KF-50B | 2 | 3.15 |
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KF Full Nipple: |
| MODEL NUMBER | TUBE
OD | A | | 2N-KF-10 | 1/2 | 2.50 | | 2N-KF-16B | 3/4 | 2.30 | | 2N-KF-25B | 1 | 4.06 | | 2N-KF-40B | 1-1/2 | 4.80 | | 2N-KF-50B | 2 | 6.30 |
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KF Reducer Nipple: |
| MODEL NUMBER | FLANGE 1 | FLANGE 2 | A | TUBE
OD | | 2NR-KF-16-10 | KF-16 | KF-10 | 1/2 | 1.40 | | 2NR-KF-25-10 | KF-25 | KF-10 | 1/2 | 1.40 | | 2NR-KF-25-16 | KF-25 | KF-16 | 3/4 | 1.30 | | 2NR-KF-40-10 | KF-40 | KF-10 | 1/2 | 1.40 | | 2NR-KF-40-16 | KF-40 | KF-16 | 3/4 | 1.30 | | 2NR-KF-40-25 | KF-40 | KF-25 | 1 | 2.18 | | 2NR-KF-50-10 | KF-50 | KF-10 | 1/2 | 1.40 | | 2NR-KF-50-16 | KF-50 | KF-16 | 3/4 | 1.30 | | 2NR-KF-50-25 | KF-50 | KF-25 | 1 | 2.18 | | 2NR-KF-50-40 | KF-50 | KF-40 | 1-1/2 | 2.55 |
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KF Conical Reducer Nipple: |
| MODEL NUMBER | FLANGE 1 | FLANGE 2 | A | B | | 2NRC-KF-25-16 | KF-25 | KF-16 | 0.620 | 1.57 | | 2NRC-KF-40-16 | KF-40 | KF-16 | 0.620 | 1.57 | | 2NRC-KF-50-16 | KF-50 | KF-16 | 0.620 | 1.57 | | 2NRC-KF-40-25 | KF-40 | KF-25 | 0.870 | 1.57 | | 2NRC-KF-50-25 | KF-50 | KF-25 | 0.870 | 1.57 | | 2NRC-KF-50-40 | KF-50 | KF-40 | 1.380 | 1.57 |
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KF 316L Conical Reducer Nipple: |
| MODEL NUMBER | FLANGE 1 | FLANGE 2 | A | B | | 2NRC-KF-40-25-316L | KF-40 | KF-25 | 0.870 | 1.57 | | 2NRC-KF-50-40-316L | KF-50 | KF-40 | 1.380 | 1.57 |
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KF 45° Radius Elbow: |
| MODEL NUMBER | TUBE
OD | A | | 2K-KF-25 | 1 | 0.77 | | 2K-KF-40 | 11/2 | 1.08 | | 2K-KF-50 | 2 | 1.39 |
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KF 45° Radius Elbow with Tangents: |
| MODEL NUMBER | TUBE
OD | A | | 2KL-KF-16 | 3/4 | 0.91 | | 2KL-KF-25 | 1 | 1.12 | | 2KL-KF-40 | 11/2 | 1.68 | | 2KL-KF-50 | 2 | 1.99 |
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KF 90° Radius Elbow: |
| MODEL NUMBER | TUBE
OD | A | B | | 2E-KF-10 | 1/2 | 1.25 | 0.75 | | 2E-KF-16B | 3/4 | 1.15 | 1.00 | | 2E-KF-25B | 1 | 1.65 | 1.50 | | 2E-KF-40B | 1-1/2 | 2.40 | 2.25 | | 2E-KF-40H | 1-1/2 | 2.56 | 2.25 | | 2E-KF-40HL | 1-1/2 | 5.12 | 2.25 | | 2E-KF-50B | 2 | 3.15 | 3.00 | | 2E-KF-50HL | 2 | 5.51 | 3.00 |
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KF 90° Mitered Elbow: |
| MODEL NUMBER | TUBE
OD | A | | 2E-KF-16MB | 3/4 | 1.15 | | 2E-KF-25MB | 1 | 2.03 | | 2E-KF-40MB | 1-1/2 | 2.40 | | 2E-KF-40MH | 1-1/2 | 2.56 | | 2E-KF-50MB | 2 | 3.15 | | 2E-KF-50MH | 2 | 2.76 |
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KF Tee: |
| MODEL NUMBER | TUBE
OD | A | | 3T-KF-10 | 1/2 | 1.25 | | 3T-KF-16B | 3/4 | 1.15 | | 3T-KF-25B | 1 | 2.03 | | 3T-KF-40B | 1-1/2 | 2.40 | | 3T-KF-40H | 1-1/2 | 2.56 | | 3T-KF-50B | 2 | 3.15 | | 3T-KF-50H | 2 | 2.76 |
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KF Reducer Tee: |
| MODEL NUMBER | TUBE 1&2
ARM OD | TUBE 3
LEG OD | A | B | | 3TR-KF-25-16B | 1 | 3/4 | 2.03 | 1.27 | | 3TR-KF-40-16B | 11/2 | 3/4 | 2.40 | 1.53 | | 3TR-KF-40-25B | 11/2 | 1 | 2.40 | 2.28 | | 3TR-KF-50-16B | 2 | 3/4 | 3.15 | 1.78 | | 3TR-KF-50-40B | 2 | 11/2 | 3.15 | 2.65 |
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KF 4-Way Cross: |
| MODEL NUMBER | TUBE
OD | A | | 4C-KF-10 | 1/2 | 1.25 | | 4C-KF-16B | 3/4 | 1.15 | | 4C-KF-25B | 1 | 2.03 | | 4C-KF-40B | 11/2 | 2.40 | | 4C-KF-40H | 11/2 | 2.56 | | 4C-KF-50B | 2 | 3.15 | | 4C-KF-50H | 2 | 2.76 |
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KF 4-Way Reducer Cross: |
| MODEL NUMBER | TUBE 1 & 2
OD | TUBE 3 & 4
OD | A | B | | 4CR-KF-25-16B | 1 | 3/4 | 2.03 | 1.27 | | 4CR-KF-40-16B | 11/2 | 3/4 | 2.40 | 1.53 | | 4CR-KF-40-25B | 11/2 | 1 | 2.40 | 2.28 | | 4CR-KF-50-16B | 2 | 3/4 | 3.15 | 1.78 | | 4CR-KF-50-40B | 2 | 11/2 | 3.15 | 2.65 |
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KF 5-Way Cross: |
| MODEL NUMBER | TUBE
OD | A | | 5C-KF-16 | 3/4 | 1.50 | | 5C-KF-25B | 1 | 2.03 | | 5C-KF-40B | 11/2 | 2.40 | | 5C-KF-50B | 2 | 3.15 |
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KF 6-Way Cross: |
| MODEL NUMBER | TUBE
OD | A | | 6C-KF-16 | 3/4 | 1.50 | | 6C-KF-25B | 1 | 2.03 | | 6C-KF-40B | 11/2 | 2.40 | | 6C-KF-50B | 2 | 3.15 |
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