About Pipe Size
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About Pressure Gauges
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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.
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Hand-Held High-Vacuum Gauges
Check the vacuum levels in high-vacuum pumps, valves, and chambers with this compact gauge. Use a ring and clamp (both sold separately) to connect them to another quick-clamp high-vacuum fitting, also known as KF, QF, and NW fittings. The digital display shows measurements in torr, mbar (millibar) and hPa (hectopascal).
- For Use With: Air
- Accuracy: ±10% @ 7.5 to 7.5 × 10 -3 torr, ±30% @ 75 to 7.5 torr
Vacuum Range | ||
|---|---|---|
| Torr | mbar | hPa |
| 750 to 7.5 × 10 -5 | 1000 to 5 × 10 -4 | 1000 to 5 × 10 -4 |
Gauges with Center Back Connection | Clamps | Rings | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High-Vacuum Flange Size | Wd. | Ht. | Dp. | Environment Temp. Range, °F | Process Temp. Range, °F | For Tube OD | Flange OD | Number of Batteries Included | Each | Each | Each | |||
Quick Clamp Tube Connection | ||||||||||||||
| 16 | 2 3/8" | 4 3/4" | 1" | 40° to 100° | 0° to 140° F | 3/4" | 1.18" | 1 | 000000 | 000000000 | 00000000 | 00000 | 00000000 | 00000 |
Absolute Pressure Gauges
Unlike other gauges that measure the difference between your system and the atmosphere, these give measurements relative to zero pressure. They’re often used in laboratory applications, and they are barometrically independent.
Gauges with a Torr scale are also known as Torr gauges.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air
- Accuracy: ±2% Full Scale (Not Graded)
Available Pressure Ranges | |||||
|---|---|---|---|---|---|
Numeric Increments | Graduation Marks | ||||
| Pressure Range, mbar | Pressure Range, Torr | mbar | Torr | mbar | Torr |
| 0 to 25 | 0 to 20 | 5 | 2 | 0.5 | 0.2 |
| 0 to 50 | 0 to 40 | 10 | 10 | 1 | 1 |
| 0 to 130 | 0 to 100 | 20 | 20 | 2 | 2 |
| 0 to 1,000 | 0 to 760 | 200 | 100 | 20 | 10 |
Bottom Connection | ||||||
|---|---|---|---|---|---|---|
| Dial Diameter | Pipe Size  | Environment Temp. Range, °F | Process Temp. Range, °F | Lens Material | Each | |
NPT Male | ||||||
| 4" | 1/4 | 5° to 120° | 0° to 145° | Glass | 000000 | 000000000 |