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For Use With
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Connects To
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Vent Thread Type
Maximum Temperature
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Maximum Pressure @ Temperature
Threaded Ring Gauges
Check a part’s external threads to make sure they fall within tolerance. You can use these for bolts, threaded rods, bits, and more. All gauges come with a manufacturer’s certificate of accuracy, also known as a certificate of compliance or a short form certification, that verifies the thread sizes are within tolerance.
The part is within tolerance if it’s easy to thread a go gauge onto, but difficult to thread a no-go gauge more than two turns. Use a threaded ring gauge holder to keep two gauges on hand at once for faster inspection.
Go gauges check the maximum external thread size.
No-go gauges check the minimum external thread size.
Threads have different classes of fit. Thread fit designates the tightness or looseness of the mating threads. For example, inch threads with a 3A fit have tighter tolerances than threads with a 2A fit.
Inch
| Thread Size  | Thread Type | Hardness | Material | For Thread Fit | Thread Direction | Pitch Dia. Tolerance | Each | |
Go Gauge | ||||||||
|---|---|---|---|---|---|---|---|---|
Class X | ||||||||
| 1"-14 | UNS | Rockwell C60 | Tool Steel | Class 2A | Right Hand | -0.0003" to 0" | 00000000 | 0000000 |
| 1"-14 | UNS | Rockwell C60 | Tool Steel | Class 3A | Right Hand | -0.0003" to 0" | 00000000 | 000000 |
No-Go Gauge | ||||||||
Class X | ||||||||
| 1"-14 | UNS | Rockwell C60 | Tool Steel | Class 2A | Right Hand | 0" to 0.0003" | 00000000 | 000000 |
| 1"-14 | UNS | Rockwell C60 | Tool Steel | Class 3A | Right Hand | 0" to 0.0003" | 00000000 | 000000 |
Threaded Ring Gauges with Calibration Certificate
Not only were these gauges calibrated in a lab, but they also come with a certificate that's traceable to NIST. The certificate, sometimes called a test report and long form certificate, details the tested measurements. They’re for checking a part’s external threads to ensure they fall within tolerance.
A part is within tolerance if it’s easy to thread a go gauge onto the part but difficult to thread a no-go gauge more than two turns. Inspect faster by holding more than one ring gauge with a threaded ring gauge holder.
Go gauges check the maximum external thread size.
No-go gauges check the minimum external thread size.
Threads have different classes of fit. Thread fit designates the tightness or looseness of the mating threads. For example, inch threads with a 3A fit have tighter tolerances than threads with a 2A fit.
Inch—Class X
| Thread Size | Thread Type | Thread Direction | Hardness | Material | Pitch Dia. Tolerance | Each | |
Go Gauge | |||||||
|---|---|---|---|---|---|---|---|
For Thread Fit Class 2A | |||||||
| 1"-14 | UNS | Right Hand | Rockwell C60 | Tool Steel | -0.0003" to 0" | 00000000 | 0000000 |
For Thread Fit Class 3A | |||||||
| 1"-14 | UNS | Right Hand | Rockwell C60 | Tool Steel | -0.0003" to 0" | 00000000 | 000000 |
No-Go Gauge | |||||||
For Thread Fit Class 2A | |||||||
| 1"-14 | UNS | Right Hand | Rockwell C60 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 |
For Thread Fit Class 3A | |||||||
| 1"-14 | UNS | Right Hand | Rockwell C60 | Tool Steel | 0" to 0.0003" | 00000000 | 000000 |
Oil-Level Indicators
Monitor hydraulic fluid or oil level in gear boxes, crank cases, and other reservoirs. These indicators mount from the outside of your tank. The gauge shield, which protects the indicator from impact, rotates 360° for optimal viewing. Use these indicators in nonpressure applications. All have a vent to prevent pressure from building up and causing an inaccurate level to display. You can also unthread the vent and replace it with your own vent, plug, fitting, or sensor.
Indicators with a 40-micron filter keep out particles as small as table salt.
Indicators with a swivel fitting have a two-piece construction, so they can be quickly disconnected.
Indicators with a drain allow you to sample hydraulic fluid from the reservoir.
Indicators
Female 90° Elbow
Male 90° Elbow
Male 90° Elbow with Swivel Fitting
Male 90° Elbow with Drain
Male Straight
Indicators | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Temp. Range, °F | Replacement Glass | ||||||||||
| Overall Ht. | Window Ht. | Body Wd. | Max. Pressure | Min. | Max. | Features | Window Material | Each | Each | ||
Brass 90° Elbow | |||||||||||
1/8 NPTF Female Thread | |||||||||||
| 4 11/16" | 2 3/4" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 000000 | 0000000 | 00000 |
1/8 NPTF Male Thread | |||||||||||
| 2 3/4" | 1 3/8" | 1 1/4" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 1 1/2" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 1 3/4" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 1/4" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 1/2" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 2 7/8" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 1/4" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 1/2" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 3/4" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 2 7/8" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
1/4 NPTF Female Thread | |||||||||||
| 3 3/16" | 1 3/8" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 00000 | 0000000 | 0000 |
| 3 11/16" | 1 7/8" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 00000 | 0000000 | 0000 |
| 4 11/16" | 2 3/4" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 00000 | 0000000 | 0000 |
| 6 3/16" | 4 1/4" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 7 3/16" | 5 1/4" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
1/4 NPTF Male Thread | |||||||||||
| 2 3/4" | 1 3/8" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 1 13/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 13/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 13/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 3/4" | 4 1/4" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 3/4" | 4 1/4" | 1 13/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 3/4" | 4 1/4" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 8 3/4" | 7 1/4" | 1 13/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
3/8 NPTF Female Thread | |||||||||||
| 3 3/16" | 1 3/8" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 00000 | 0000000 | 0000 |
| 3 11/16" | 1 7/8" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 00000 | 0000000 | 0000 |
| 4 11/16" | 2 3/4" | 7/8" | Not Rated | -40° | 250° | Vent | Glass | 000000 | 00000 | 0000000 | 0000 |
| 6 1/4" | 4 1/4" | 1" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/2" | 7 1/2" | 1" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/2" | 12 1/2" | 1" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
3/8 NPTF Male Thread | |||||||||||
| 2 3/4" | 1 3/8" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 1 7/8" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 2 3/4" | 1 3/8" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 1 7/8" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/4" | 1 7/8" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 1/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 1 7/8" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/4" | 2 3/4" | 2 11/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 3/4" | 3 1/4" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 3/4" | 4 1/4" | 1 9/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 7/8" | 4 1/4" | 1 5/8" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 7/8" | 4 1/4" | 2 7/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 7/8" | 4 1/4" | 3 3/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 000000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 1 5/8" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 2 3/8" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 2 7/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 3 3/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 000000 | 0000000 | 0000 |
| 14 1/8" | 12 1/4" | 3 3/16" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 000000 | 0000000 | 0000 |
| 14 1/8" | 12 1/2" | 1 5/8" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/8" | 12 1/2" | 2 7/16" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
1/2 NPTF Female Thread | |||||||||||
| 6 1/4" | 4 1/4" | 1" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/2" | 7 1/2" | 1" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/2" | 12 1/2" | 1" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
1/2 NPTF Male Thread | |||||||||||
| 5 7/8" | 4 1/4" | 1 7/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 7/8" | 4 1/4" | 2 3/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 7/8" | 4 1/4" | 2 1/4" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 7/8" | 4 1/4" | 3" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 1 7/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 2 3/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 2 1/4" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/8" | 7 1/2" | 3" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/8" | 12 1/4" | 3" | Not Rated | -40° | 250° | Vent, Drain | Glass | 0000000 | 000000 | 0000000 | 0000 |
| 14 1/8" | 12 1/2" | 1 7/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/8" | 12 1/2" | 2 3/16" | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/8" | 12 1/2" | 2 1/4" | Not Rated | -40° | 250° | Vent, Swivel Fitting | Glass | 0000000 | 00000 | 0000000 | 0000 |
Brass Straight | |||||||||||
1/8 NPTF Male Thread | |||||||||||
| 2 5/16" | 1 3/8" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 5/16" | 1 7/8" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 13/16" | 1 7/8" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5 13/16" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 6 5/16" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
1/4 NPTF Male Thread | |||||||||||
| 3" | 1 3/8" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/2" | 1 3/8" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/2" | 1 7/8" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4" | 1 7/8" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/2" | 2 3/4" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5" | 2 3/4" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 6" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 6 1/2" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 1/4" | 7 1/2" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 3/4" | 7 1/2" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
3/8 NPTF Male Thread | |||||||||||
| 3" | 1 3/8" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/2" | 1 3/8" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 3 1/2" | 1 7/8" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4" | 1 7/8" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 4 1/2" | 2 3/4" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 5" | 2 3/4" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 6" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 6 1/2" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 11 1/4" | 9 1/2" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 11 3/4" | 9 1/2" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 1/4" | 12 1/2" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 3/4" | 12 1/2" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
1/2 NPTF Male Thread | |||||||||||
| 6 3/16" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 6 11/16" | 4 1/4" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 7/16" | 7 1/2" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 9 15/16" | 7 1/2" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 11 7/16" | 9 1/2" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 11 15/16" | 9 1/2" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 7/16" | 12 1/2" | __ | Not Rated | -40° | 250° | Vent | Glass | 0000000 | 00000 | 0000000 | 0000 |
| 14 15/16" | 12 1/2" | __ | Not Rated | -40° | 250° | Vent, 40-Micron Filter | Glass | 0000000 | 00000 | 0000000 | 0000 |