5⁄8"-18 Thread Plug Gauges

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Unified Standard Class 2B

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Calibration Certificate Traceable to NIST

DFARS Specialty Metals

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REACH

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

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Material

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Gauge Measurement Type

No-Go

Size-Checking Gauge Class

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10 Products

Go/No-Go Threaded Plug Gauges with Handle

Speed up thread tolerance checks—the handle on these gauges gives you a good grip to quickly thread and unthread go or no-go gauges. Use these gauges to make sure nuts, tapped holes, and other parts fall within tolerance. All are precisely manufactured to confirm thread fit. If the plug gauges wear down, you can insert new ones (not included) onto the taperlock handle.

A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.

Go/no-go gauges have both a go gauge on one end of the handle and a no-go gauge on the other to speed up tests. Go gauges check the minimum internal thread size. No-go gauges check the maximum internal thread size.

Class X Gauge

Double-Ended Taperlock

Handle

Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Go/No-Go Gauges



	5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A534	0000000


	Go/No-Go Gauges with Calibration Certificate Traceable to NIST



			5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A43	000000

Go/No-Go Left-Hand Threaded Plug Gauges with Handle

A go and no-go gauge in one, these gauges check that left-hand threads fall within tolerance. Use them to confirm thread fit for nuts, tapped holes, and other parts. The taperlock handle speeds up tests, giving you a good grip to thread and unthread each gauge end. It also lets you swap out worn gauges for new ones (not included) on either end.

The go gauge checks the minimum internal thread size, and the no-go gauge checks the maximum. A part is within tolerance if it’s easy to thread the go gauge but difficult to thread the no-go gauge more than two turns.

Class X Gauge

Plug Gauges with Accuracy Certificate Traceable to NIST—Gauges with an accuracy certificate traceable to NIST include verification from the manufacturer that their thread sizes are within tolerance. The certificate is also known as a certificate of compliance or a short-form certification.

Plug Gauges with Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Plug Gauges with Accuracy Certificate Traceable to NIST



	5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N107	0000000


	Plug Gauges with Calibration Certificate Traceable to NIST



			5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N107	000000

Threaded Plug Gauges

Test if internal threads fall within tolerance. These plug gauges are often used in nuts and tapped holes to confirm thread fit. For precision and accuracy, they’re manufactured to tight tolerances.

Threads are within tolerance if it’s easy to thread a go gauge but difficult to thread a no-go gauge more than two turns.

Class X Gauge

Go Gauge—Go gauges check the minimum hole diameter.

No-Go Gauge—No-go gauges check the maximum hole diameter.

Accuracy Certificate Traceable to NIST—Gauges with an accuracy certificate traceable to NIST include verification from the manufacturer that their thread sizes are within tolerance. The certificate is also known as a certificate of compliance or a short-form certification.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	For Thread Fit		Each
Go Gauges



	5/8"-18	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N31	000000


	Go Gauges with Accuracy Certificate Traceable to NIST



			5/8"-18	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N121	00000


			No-Go Gauges



					5/8"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N73	00000


					5/8"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N74	00000


					No-Go Gauges with Accuracy Certificate Traceable to NIST



							5/8"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N163	00000


							5/8"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N164	00000