How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
More
About Hose
More
High-Vacuum Exhaust Hose with Quick-Clamp Fittings

Connect to high-vacuum pumps to route exhaust fumes out of your work area. Also known as roughing hose. This hose is equipped with quick-clamp (KF) fittings; a clamp and a ring (both sold separately) are required for each fitting. Hose is flexible so you can snake it around equipment. It's reinforced with wire to prevent it from collapsing. Not for use in pressure applications.
For technical drawings and 3-D models, click on a part number.

- Temperature Range: 25° to 150° F
- Material: PVC Plastic
- Color: Clear
- Fitting Material: 304 Stainless Steel
For Tube OD | Flange OD | High-Vacuum Flange Size | ID | OD | Wall Thickness | Bend Radius | High Vacuum Connection Type | Max. Vacuum | Each | |
5 ft. Lg. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
3/4" | 1.18" | 16 | 3/4" | 1" | 0.139" | 3" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 0000000 |
1" | 1.57" | 25 | 1" | 1 5/16" | 0.145" | 4" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 1 7/8" | 0.18" | 6" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 3/8" | 0.195" | 8" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
10 ft. Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1" | 0.139" | 3" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 5/16" | 0.145" | 4" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 1 7/8" | 0.18" | 6" | ISO-KF | 1 × 10 -8 torr @ 72° F | 000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 3/8" | 0.195" | 8" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
15 ft. Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1" | 0.139" | 3" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 5/16" | 0.145" | 4" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 1 7/8" | 0.18" | 6" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 3/8" | 0.195" | 8" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
20 ft. Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1" | 0.139" | 3" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 5/16" | 0.145" | 4" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 1 7/8" | 0.18" | 6" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 3/8" | 0.195" | 8" | ISO-KF | 1 × 10 -8 torr @ 72° F | 0000000 | 000000 |

For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Each | |
With Wing Nut | |||||||
---|---|---|---|---|---|---|---|
1/2", 3/4" | 1.18" | 10, 16 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 00000000 | 00000 |
1" | 1.57" | 25 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
2" | 2.95" | 50 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |

Material | ||||||||
---|---|---|---|---|---|---|---|---|
For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | O-Ring | Inner Ring | Max. Vacuum | Each | |
3/4" | 1.18" | 16 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 00000000 | 00000 |
1" | 1.57" | 25 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
1 1/2" | 2.16" | 40 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
2" | 2.95" | 50 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
Abrasion-Resistant High-Vacuum Hose with Quick-Clamp Fittings

A braided exterior protects this hose from abrasion and over-bending. Also known as bellows, the ribbed interior makes it flexible enough to connect high-vacuum components that aren't directly aligned. It also reduces vibration between components such as pumps, valves, and chambers. Connect to your components with the quick-clamp (KF) fittings; a clamp and a ring (both sold separately) are required for each fitting. Not for use in pressure applications.


- Temperature Range: Not Rated
- Material: 304 Stainless Steel
- Fitting Material: 304 Stainless Steel
For Tube OD | Flange OD | High-Vacuum Flange Size | ID | OD | Wall Thickness | Bend Radius | High Vacuum Connection Type | Max. Vacuum | Each | |
6" Lg. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
3/4" | 1.18" | 16 | 3/4" | 1 3/16" | 0.006" | __ | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 0000000 |
1" | 1.57" | 25 | 1" | 1 7/16" | 0.006" | __ | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 2 1/8" | 0.006" | 10" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 5/8" | 0.006" | 11 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
12" Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1 3/16" | 0.008" | 6 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 7/16" | 0.008" | 7 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 2 1/8" | 0.008" | 10" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 5/8" | 0.008" | 11 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
24" Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1 3/16" | 0.008" | 6 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 7/16" | 0.008" | 7 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 2 1/8" | 0.008" | 10" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 5/8" | 0.008" | 11 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
36" Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1 3/16" | 0.008" | 6 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 7/16" | 0.008" | 7 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 2 1/8" | 0.008" | 10" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 5/8" | 0.008" | 11 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
39" Lg. | ||||||||||
3/4" | 1.18" | 16 | 3/4" | 1 3/16" | 0.008" | 6 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1" | 1.57" | 25 | 1" | 1 7/16" | 0.008" | 7 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
1 1/2" | 2.16" | 40 | 1 1/2" | 2 1/8" | 0.008" | 10" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
2" | 2.95" | 50 | 2" | 2 5/8" | 0.008" | 11 1/2" | ISO-KF | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |

For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Each | |
With Wing Nut | |||||||
---|---|---|---|---|---|---|---|
1/2", 3/4" | 1.18" | 10, 16 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 00000000 | 00000 |
1" | 1.57" | 25 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
2" | 2.95" | 50 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |

Material | ||||||||
---|---|---|---|---|---|---|---|---|
For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | O-Ring | Inner Ring | Max. Vacuum | Each | |
3/4" | 1.18" | 16 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 00000000 | 00000 |
1" | 1.57" | 25 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
1 1/2" | 2.16" | 40 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
2" | 2.95" | 50 | ISO-KF | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
High-Vacuum Hose with Claw-Clamp Fittings

More flexible than rigid stainless steel tubing, this hose allows you to link high-vacuum components that are misaligned. Also known as bellows. The ribbed design absorbs vibration so it doesn't transfer from one component to the next. Equipped with a claw-clamp (ISO-K) fitting on each end, this hose connects to large components with fittings starting at trade number 63. Each fitting on the hose requires four claw clamps and a ring (both sold separately) to connect. Not for use in pressure applications.
Double-claw clamps attach to the grooves on the fittings.
Single-claw clamps have a clamp on one end and an exposed bolt on the other. Thread the bolt-end directly into the body of pumps, valves, or other high-vacuum components.

- Temperature Range: Not Rated
- Material:
6" Lengths: 321 Stainless Steel
Other Lengths: 304 Stainless Steel - Fitting Material: 304 Stainless Steel
For Tube OD | Flange OD | High-Vacuum Flange Size | ID | OD | Wall Thickness | Bend Radius | High Vacuum Connection Type | Max. Vacuum | Each | |
6" Lg. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
2 1/2" | 3.74" | 63 | 2 1/2" | 3 5/16" | 0.008" | 2 3/4" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 0000000 |
3" | 4.33" | 80 | 3" | 3 15/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 15/16" | 0.008" | 3 1/2" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 7/8" | 0.01" | 5 1/4" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
12" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
24" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 00000000 |
36" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 00000000 |
39" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 00000000 |


For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Each | |
Double Claw | |||||||
---|---|---|---|---|---|---|---|
2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
Single Claw | |||||||
2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
6" | 7.09" | 160 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |

Material | |||||||||
---|---|---|---|---|---|---|---|---|---|
For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | O-Ring | Inner Ring | Max. Vacuum | Max. Temp., °F | Each | |
2 1/2" | 3.74" | 63 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 000000 |
3" | 4.33" | 80 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 000000 | 00000 |
4" | 5.12" | 100 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 00000 |
Ultra-High-Vacuum Hose with Flanges
Often found in semiconductor manufacturing and other demanding industrial applications, this hose handles nearly perfect vacuum. Sharp edges on the flanges dig into a copper gasket (sold separately) as you bolt the flanges together, creating a tighter seal than fittings with a rubber gasket. This allows the hose to maintain the ultra-high vacuum necessary for vacuum coating, heat treating, leak testing, and analyzing gases. The flanges are commonly referred to as ConFlat (CF) and UHV fittings. Thanks to its ribbed interior, this hose is flexible enough to connect misaligned components. That's why it's also called a bellows. The ribbing reduces vibration between components, such as vacuum pumps, valves, and chambers. Both the hose and flanges are made of stainless steel, so they resist rusting.
One of the flanges rotates, so you can easily match up the bolt holes with another flange. Make sure your mating flanges are the same size as these flanges.
Bolt kits are required to make a complete connection.
For technical drawings and 3-D models, click on a part number.


- Temperature Range: -200° to 900° F
- Maximum Vacuum: 10 -13 torr @ 72° F
- Material: 321 Stainless Steel
- Fitting Material: 304 Stainless Steel
Bolt Hole | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | ID | OD | Wall Thickness | Bend Radius | Bolt Circle Dia. | Dia. | No. of | Each | |
Fixed Flange × Rotating Flange | ||||||||||||
4" Lg. | ||||||||||||
3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 0000000 | 0000000 |
1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
6" Lg. | ||||||||||||
2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |
12" Lg. | ||||||||||||
3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 00000000 | 000000 |
1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |
24" Lg. | ||||||||||||
3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 00000000 | 000000 |
1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |
36" Lg. | ||||||||||||
3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 00000000 | 000000 |
1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |

For Flange OD | For High-Vacuum Flange Size | Bolt Dia. | Thread Size | No. of Bolts Included | No. of Nuts Included | No. of Washers Included | Bolt Material | Each | |
1 21/64" | 16 | 0.164" | 8-32 | 6 | 6 | 12 | 18-8 Stainless Steel | 0000000 | 00000 |
2 3/4" | 40 | 1/4" | 1/4"-28 | 6 | 6 | 12 | 18-8 Stainless Steel | 0000000 | 00000 |
4 1/2" | 63 | 5/16" | 5/16"-24 | 8 | 8 | 16 | 18-8 Stainless Steel | 0000000 | 00000 |
6" | 100 | 5/16" | 5/16"-24 | 16 | 16 | 32 | 18-8 Stainless Steel | 0000000 | 00000 |