UNF Ring Gauges | McMaster-Carr

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216 Products

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.

Class X Gauges

Go Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

For Thread Fit—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.

						Go Gauge			No-Go Gauge
	Thread Size	Thread Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
For Class 2A Unified Standard Thread Fit







				UNF Thread

				0-80	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A121	0000000	0" to 0.0002"	3160A223	0000000


				1-72	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A125	000000	0" to 0.0002"	3160A227	000000
				2-64	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A129	000000	0" to 0.0002"	3160A232	000000
				3-56	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A405	000000	0" to 0.0002"	3160A407	000000
				4-48	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A138	000000	0" to 0.0002"	3160A241	000000
				5-44	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A401	000000	0" to 0.0002"	3160A403	000000
				6-40	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A147	000000	0" to 0.0002"	3160A249	000000
				8-36	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A152	000000	0" to 0.0002"	3160A254	000000
				10-32	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A156	000000	0" to 0.0003"	3160A258	000000
				12-28	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A161	000000	0" to 0.0003"	3160A263	000000
				1/4"-28	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A165	000000	0" to 0.0003"	3160A267	000000


				5/16"-24	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A169	000000	0" to 0.0003"	3160A272	000000
				3/8"-24	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A174	000000	0" to 0.0003"	3160A276	000000
				7/16"-20	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A178	000000	0" to 0.0003"	3160A281	000000
				1/2"-20	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A183	000000	0" to 0.0003"	3160A285	000000
				9/16"-18	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A114	000000	0" to 0.0003"	3160A118	000000
				5/8"-18	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A187	000000	0" to 0.0003"	3160A289	000000
				3/4"-16	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A192	000000	0" to 0.0003"	3160A294	000000
				7/8"-14	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A196	000000	0" to 0.0003"	3160A298	000000
				1"-12	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A201	000000	0" to 0.0003"	3160A303	000000
				1 1/8"-12	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A207	000000	0" to 0.0003"	3160A309	000000


				1 1/4"-12	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A212	000000	0" to 0.0003"	3160A314	000000
				1 3/8"-12	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A475	000000	0" to 0.0003"	3160A477	000000
				1 1/2"-12	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A221	000000	0" to 0.0003"	3160A323	000000


				For Class 3A Unified Standard Thread Fit







								UNF Thread

								0-80	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A119	000000	0" to 0.0002"	3160A222	000000


								1-72	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A124	000000	0" to 0.0002"	3160A226	000000
								2-64	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A128	000000	0" to 0.0002"	3160A231	000000
								3-56	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A406	000000	0" to 0.0002"	3160A408	000000
								4-48	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A137	000000	0" to 0.0002"	3160A239	000000
								5-44	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A402	000000	0" to 0.0002"	3160A404	000000
								6-40	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A146	000000	0" to 0.0002"	3160A248	000000
								8-36	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0002" to 0"	3160A151	000000	0" to 0.0002"	3160A253	000000
								10-32	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A155	000000	0" to 0.0003"	3160A257	000000
								12-28	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A159	000000	0" to 0.0003"	3160A262	000000
								1/4"-28	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A164	000000	0" to 0.0003"	3160A266	000000


5/16"-24	Right Hand							Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A168	000000	0" to 0.0003"	3160A271	000000
3/8"-24	Right Hand							Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A173	000000	0" to 0.0003"	3160A275	000000
7/16"-20	Right Hand							Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A177	000000	0" to 0.0003"	3160A279	000000
1/2"-20	Right Hand	Rockwell C60						Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A182	000000	0" to 0.0003"	3160A284	000000
9/16"-18	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A113	000000	0" to 0.0003"	3160A117	000000
5/8"-18	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A186	000000	0" to 0.0003"	3160A288	000000
3/4"-16	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A191	000000	0" to 0.0003"	3160A293	000000
7/8"-14	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A195	000000	0" to 0.0003"	3160A297	000000
1"-12	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A199	000000	0" to 0.0003"	3160A302	000000
1 1/8"-12	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A206	000000	0" to 0.0003"	3160A308	000000


1 1/4"-12	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A211	000000	0" to 0.0003"	3160A313	000000
1 3/8"-12	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A476	000000	0" to 0.0003"	3160A478	000000
1 1/2"-12	Right Hand	Rockwell C60	Tool Steel					Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A219	000000	0" to 0.0003"	3160A322	000000

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 Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

							Go Gauge			No-Go Gauge
	Thread Size	Thread Type	Hardness	Material	Thread Direction	Choose a Thread Fit	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
Class X Gauges



		0-80	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A301	0000000	0" to 0.0002"	2356A401	0000000


		1-72	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A303	000000	0" to 0.0002"	2356A403	000000
		2-64	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A011	000000	0" to 0.0002"	2356A012	000000
		3-56	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A013	000000	0" to 0.0002"	2356A014	000000
		4-48	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A309	000000	0" to 0.0002"	2356A409	000000
		5-44	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A015	000000	0" to 0.0002"	2356A016	000000
		6-40	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A314	000000	0" to 0.0002"	2356A414	000000
		8-36	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0002" to 0"	2356A316	000000	0" to 0.0002"	2356A416	000000
		10-32	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A318	000000	0" to 0.0003"	2356A418	000000
		12-28	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A017	000000	0" to 0.0003"	2356A018	000000
		1/4"-28	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A323	000000	0" to 0.0003"	2356A423	000000


		5/16"-24	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A325	000000	0" to 0.0003"	2356A425	000000
		3/8"-24	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A327	000000	0" to 0.0003"	2356A427	000000
		7/16"-20	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A329	000000	0" to 0.0003"	2356A429	000000
		1/2"-20	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A332	000000	0" to 0.0003"	2356A432	000000
		9/16"-18	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A181	000000	0" to 0.0003"	2356A185	000000
		5/8"-18	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A334	000000	0" to 0.0003"	2356A434	000000
		3/4"-16	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A336	000000	0" to 0.0003"	2356A436	000000
		7/8"-14	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A338	000000	0" to 0.0003"	2356A438	000000
		1"-12	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A341	000000	0" to 0.0003"	2356A441	000000
		1 1/8"-12	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A344	000000	0" to 0.0003"	2356A444	000000


		1 1/4"-12	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A346	000000	0" to 0.0003"	2356A446	000000
		1 3/8"-12	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A046	000000	0" to 0.0003"	2356A047	000000
		1 1/2"-12	UNF	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A, Unified Standard Class 3A	-0.0003" to 0"	2356A048	000000	0" to 0.0003"	2356A049	000000

Left-Hand Threaded Ring Gauges with Calibration Certificate

Calibrated in a lab and backed by a certificate traceable to NIST, these gauges check if left-hand threads fall within tolerance. The certificate, sometimes called a test report and long-form certificate, details the tested measurements. Use these gauges on screws, threaded rods, and other parts with external threads. For faster tests, hold more than one ring gauge with a threaded ring gauge holder.

Your part is within tolerance if it’s easy to thread a go gauge onto it but difficult to thread a no-go gauge more than two turns.

Class X Gauges

Go Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads. For inch threads, the higher the class number, the tighter the fit. These metric-threaded ring gauges are class 6g, which is comparable to the fit of those with unified standard class 2A threads.

						Go Gauge			No-Go Gauge
	Thread Size	Thread Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
For Class 2A Unified Standard Thread Fit







				UNF Thread

				10-32	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N11	0000000	0" to 0.0003"	7836N53	0000000


				1/4"-28	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N13	000000	0" to 0.0003"	7836N55	000000
				5/16"-24	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N15	000000	0" to 0.0003"	7836N57	000000
				3/8"-24	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N17	000000	0" to 0.0003"	7836N59	000000
				7/16"-20	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N19	000000	0" to 0.0003"	7836N62	000000
				1/2"-20	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N22	000000	0" to 0.0003"	7836N64	000000
				5/8"-18	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N24	000000	0" to 0.0003"	7836N66	000000
				3/4"-16	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N26	000000	0" to 0.0003"	7836N68	000000
				1 1/4"-12	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N28	000000	0" to 0.0003"	7836N71	000000


				For Class 3A Unified Standard Thread Fit







								UNF Thread

								10-32	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N12	000000	0" to 0.0003"	7836N54	000000


								1/4"-28	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N14	000000	0" to 0.0003"	7836N56	000000
								5/16"-24	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N16	000000	0" to 0.0003"	7836N58	000000
								3/8"-24	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N18	000000	0" to 0.0003"	7836N61	000000
								7/16"-20	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N21	000000	0" to 0.0003"	7836N63	000000
								1/2"-20	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N23	000000	0" to 0.0003"	7836N65	000000
								5/8"-18	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N25	000000	0" to 0.0003"	7836N67	000000
								3/4"-16	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N27	000000	0" to 0.0003"	7836N69	000000
								1 1/4"-12	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	7836N29	000000	0" to 0.0003"	7836N72	000000

Left-Hand Threaded Ring Gauges

Test if the left-hand threads on parts fall within tolerance. These gauges are often used with parts such as screws, bolts, and threaded rods. All 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.

Class X Gauges

Image of Product. Front orientation. Ring Gauges. Left-Hand Threaded Ring Gauges.

Go Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

						Go Gauge			No-Go Gauge
	Thread Size	Thread Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
For Class 2A Unified Standard Thread Fit







				UNF Thread

				10-32	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N11	0000000	0" to 0.0003"	8399N53	0000000


				1/4"-28	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N13	000000	0" to 0.0003"	8399N55	000000
				5/16"-24	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N15	000000	0" to 0.0003"	8399N57	000000
				3/8"-24	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N17	000000	0" to 0.0003"	8399N59	000000
				7/16"-20	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N19	000000	0" to 0.0003"	8399N62	000000
				1/2"-20	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N22	000000	0" to 0.0003"	8399N64	000000
				5/8"-18	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N24	000000	0" to 0.0003"	8399N66	000000
				3/4"-16	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N26	000000	0" to 0.0003"	8399N68	000000
				1 1/4"-12	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N28	000000	0" to 0.0003"	8399N71	000000


				For Class 3A Unified Standard Thread Fit







								UNF Thread

								10-32	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N12	000000	0" to 0.0003"	8399N54	000000


								1/4"-28	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N14	000000	0" to 0.0003"	8399N56	000000
								5/16"-24	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N16	000000	0" to 0.0003"	8399N58	000000
								3/8"-24	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N18	000000	0" to 0.0003"	8399N61	000000
								7/16"-20	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N21	000000	0" to 0.0003"	8399N63	000000
								1/2"-20	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N23	000000	0" to 0.0003"	8399N65	000000
								5/8"-18	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N25	000000	0" to 0.0003"	8399N67	000000
								3/4"-16	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N27	000000	0" to 0.0003"	8399N69	000000
								1 1/4"-12	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.0003" to 0"	8399N29	000000	0" to 0.0003"	8399N72	000000