Fed. Spec. GGG-R-791 Rulers

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180 Products

About High-Quality Rulers

What separates a throwaway ruler from one you’ll keep for decades, which type is best for everyday use, and how to compare materials.

High-Accuracy Rulers

With tolerances tight enough for machining detailed parts, these rulers are the most accurate we offer. They're also the most precise, with graduations as small as _1/64", so you can trust them for even the tiniest dimensions. Also known as machinists' rules.

All are precision made and etched in the U.S. to meet federal standards. Made of tempered steel for extra strength, they keep their shape even after multiple hard hits and drops, so they'll measure accurately for years to come. Their graduations are deeply engraved and blackened with ink, meaning they won't rub off like printed graduations can.

Satin Chrome-Plated Steel

Image of Product. Front orientation. Rulers. High-Accuracy Rulers, Chrome-Plated Steel.

Tough enough to handle most tasks, these rulers are chrome plated to resist rust. Their satin finish reduces glare for easy reading.

Starrett Rulers—These rulers are manufactured by Starrett, one of the most trusted names for precision measuring tools.

Calibration Certificate—When precision measurements are required for quality control or by regulation, use a ruler that includes a calibration certificate traceable to NIST. The certificate states that the ruler has passed a test for accuracy, so you can be confident your measurements are correct and consistent.

								Rulers		Rulers with Calibration Certificate
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Accuracy	Wd.	Thk.	Mfr. Model No.		Each		Each
Inch







				Rulers

				6"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	1/2"	1/64"	—	2042A55	000000	———	0


				6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	1/2"	1/64"	—	2042A65	00000	———	0
				6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	3/4"	3/64"	—	2042A81	00000	———	0
				6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	1/2"	1/64"	—	2042A61	00000	2056A32	000000
				6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	3/4"	3/64"	—	2042A76	00000	2056A16	00000
				6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.004"	1/2"	1/64"	—	2042A68	00000	———	0
				6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.004"	3/4"	3/64"	—	2042A85	00000	———	0
				6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	3/4"	3/64"	—	2042A72	00000	2056A11	00000
				12"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1/2"	1/64"	—	2042A56	00000	———	0
				12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1/2"	1/64"	—	2042A66	00000	———	0
				12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/64"	—	2042A82	00000	———	0


				12"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1/2"	1/64"	—	2042A62	00000	2056A33	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/64"	—	2042A77	00000	2056A17	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.005"	1/2"	1/64"	—	2042A69	00000	———	0
				12"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.005"	1"	3/64"	—	2042A86	00000	———	0
				12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/64"	—	2042A73	00000	2056A12	00000
				18"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	3/4"	1/64"	—	2042A57	00000	———	0
				18"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"	3/4"	1/64"	—	2042A67	00000	———	0
				18"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"	1 1/8"	3/64"	—	2042A83	00000	———	0
				18"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"	3/4"	1/64"	—	2042A63	00000	———	0
				18"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"	1 1/8"	3/64"	—	2042A78	00000	———	0


				18"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.006"	3/4"	1/64"	—	2042A71	00000	———	0
				18"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.006"	1 1/8"	3/64"	—	2042A87	00000	———	0
				18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1 1/8"	3/64"	—	2042A74	00000	———	0
				24"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	3/4"	1/64"	—	2042A58	00000	———	0
				24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	3/4"	1/64"	—	2042A88	00000	———	0
				24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1 1/8"	3/64"	—	2042A84	00000	———	0
				24"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	3/4"	1/64"	—	2042A64	00000	2056A34	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1 1/8"	3/64"	—	2042A79	00000	2056A18	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1 1/8"	3/64"	—	2042A75	00000	2056A13	000000
				36"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	3/4"	1/64"	—	2042A95	000000	2056A35	000000


				36"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1 1/4"	3/64"	—	2042A93	000000	2056A19	000000
				36"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1 1/4"	3/64"	—	2042A91	000000	2056A14	000000
				48"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.008"	1 1/4"	3/64"	—	2042A47	000000	———	0
				48"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.008"	3/4"	1/64"	—	2042A96	000000	———	0
				48"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.008"	1 1/4"	3/64"	—	2042A94	000000	2056A21	000000
				48"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.008"	1 1/4"	3/64"	—	2042A92	000000	2056A15	000000




						Starrett Rulers

						3"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	9/16"	3/64"	C604R-3	2117A17	00000	———	0


						6"	1/64" (8/64")	1/16" (1"), 1/32" (4/32")	-0.0035" to 0.004"	1/2"	1/64"	C309R-6	2285A21	00000	———	0
6"						1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	3/4"	3/64"	C604R-6	2117A11	00000	2117A69	00000
6"	1/64" (8/64"), 1/32" (4/32")					1/8" (1"), 1/16" (1"), 1/32" (4/32")	-0.0035" to 0.004"	3/4"	3/64"	C604RE-6	2117A27	00000	———	0
6"	1/50" (1/10"), 1/50" (1/10")					1/10" (1/10"), 1/10" (1/10")	-0.0035" to 0.004"	3/4"	3/64"	C606R-6	2117A31	00000	2117A72	00000
6"	1/32" (4/32"), 1/64" (8/64")					1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	1/2"	1/64"	C316R-6	2285A35	00000	———	0
6"	1/32" (4/32"), 1/64" (8/64")					1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	3/4"	3/64"	C616R-6	2117A21	00000	———	0
6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")				-0.0035" to 0.004"	1/2"	1/64"	C305R-6	2285A5	00000	2117A75	00000
6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/50" (1/10")	-0.0035" to 0.004"			1/2"	1/64"	C303R-6	2285A25	00000	———	0
12"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"			1"	3/64"	C604R-12	2117A12	00000	2117A28	000000
12"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1"), 1/32" (4/32")	-0.0035" to 0.005"			1"	3/64"	C604RE-12	2117A33	00000	———	0


12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"			1/2"	1/64"	C316R-12	2285A36	00000	———	0
12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"			1"	3/64"	C616R-12	2117A22	00000	———	0
12"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"			1/2"	1/64"	C305R-12	2285A6	00000	2117A76	000000
18"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"			1 1/8"	3/64"	C604R-18	2117A13	000000	———	0
18"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"			3/4"	1/64"	C305R-18	2285A7	000000	———	0
24"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"			1 1/4"	3/64"	C604R-24	2117A14	000000	2117A71	000000
24"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"			3/4"	1/64"	C305R-24	2285A8	000000	———	0
36"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"			1 1/4"	3/64"	C604R-36	2117A15	000000	2117A29	000000
72"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.007" to 0.012"			1 1/2"	3/32"	C404R-72	2117A43	000000	2117A44	00000000
72"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.007" to 0.012"			1 1/2"	3/32"	C416R-72	2117A19	00000000	———	0


Inch/Metric







						Rulers

						6"/150 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	1/2"	1/64"	—	6823A7	00000	———	0


						6"/150 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	3/4"	3/64"	—	6823A5	00000	2056A22	00000
						12"/300 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.005"/-0.09 mm to 0.13 mm	1/2"	1/64"	—	6823A8	00000	———	0
						12"/300 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.005"/-0.09 mm to 0.13 mm	1"	3/64"	—	6823A6	00000	2056A23	00000
						18"/450 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.006"/-0.09 mm to 0.15 mm	3/4"	1/64"	—	6823A51	00000	———	0
						18"/450 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.006"/-0.09 mm to 0.15 mm	1 1/8"	3/64"	—	6823A61	00000	———	0
						24"/600 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.007"/-0.09 mm to 0.18 mm	3/4"	1/64"	—	6823A52	00000	———	0
						24"/600 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.007"/-0.09 mm to 0.18 mm	1 1/8"	3/64"	—	6823A62	00000	2056A24	000000
						36"/900 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.007"/-0.09 mm to 0.18 mm	1 1/8"	3/64"	—	———	0	2056A25	000000
						48"/1,200 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.008"/-0.09 mm to 0.2 mm	1 1/4"	3/64"	—	———	0	2056A26	000000




								Starrett Rulers

								5 3/4"/150 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	1/2"	1/64"	C331-150	2285A55	00000	———	0


								5 3/4"/150 mm	1/10" (1/10"), 1/50" (1/10")	1 mm (10 mm), 0.5 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	1/2"	1/64"	C334-150	2285A45	00000	2117A77	00000
								5 3/4"/150 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	3/4"	3/64"	C636ME-150	2117A51	00000	2117A73	00000
								11 3/4"/300 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.005"/-0.09 mm to 0.15 mm	1/2"	1/64"	C331-300	2285A56	00000	———	0
				11 3/4"/300 mm				0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/-0.09 mm to 0.15 mm	1"	3/64"	C636-300	2117A52	00000	2117A74	000000
				19 1/2"/500 mm	0.5 mm (10 mm), 1/32" (4/32")			1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/-0.09 mm to 0.2 mm	1 1/8"	3/64"	C636-500	2117A53	000000	2117A67	000000
				39 1/4"/1,000 mm	0.5 mm (10 mm), 1/32" (4/32")			1 mm (10 mm), 1/64" (8/64")	-0.005" to 0.010"/-0.11 mm to 0.25 mm	1 1/4"	3/64"	C636-1000	2117A54	000000	2117A68	000000


				Metric







										Rulers

										150 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.1 mm	1/2"	1/64"	—	6823A3	00000	———	0


										150 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.1 mm	3/4"	3/64"	—	6823A1	00000	———	0
										300 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.13 mm	1/2"	1/64"	—	6823A4	00000	———	0
										300 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.13 mm	1"	3/64"	—	6823A2	00000	———	0
										450 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.15 mm	3/4"	1/64"	—	6823A31	00000	———	0
										450 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.15 mm	1 1/8"	3/64"	—	6823A41	00000	———	0
										600 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.18 mm	3/4"	1/64"	—	6823A32	00000	———	0
										600 mm	1 mm (10 mm), 0.5 mm (10 mm)	1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.18 mm	1 1/8"	3/64"	—	6823A42	00000	———	0




												Starrett Rulers

150 mm												0.5 mm (10 mm)	0.5 mm (10 mm), 1 mm (10 mm)	-0.09 mm to 0.1 mm	1/2"	1/64"	C330-150	2285A65	00000	———	0


150 mm	1 mm (10 mm), 0.5 mm (10 mm), 1 mm, 1 mm											1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.1 mm	3/4"	3/64"	C635E-150	2117A56	00000	———	0
300 mm	1 mm (10 mm), 0.5 mm (10 mm)											1 mm (10 mm), 0.5 mm (10 mm)	-0.09 mm to 0.15 mm	1"	3/64"	C635-300	2117A55	00000	———	0

Satin Chrome-Plated Steel with Easy-Align Hook End

Take accurate measurements even when you can't see the exact edge of what you're measuring, such as when working with round corners. Similar to a tape measure, these rulers have a hook on one end to catch the edge of an object, keeping the ruler straight. Turn the stud to remove or reverse the hook.

Tough enough to handle most tasks, these rulers are chrome plated to resist rust. Their satin finish reduces glare for easy reading.

Starrett Rulers—These rulers are manufactured by Starrett, one of the most trusted names for precision measuring tools.

								Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Accuracy	Wd.	Thk.	Mfr. Model No.		Each
Inch







				Starrett Rulers

				6"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	3/4"	3/64"	CH604R-6	2113A21	000000


				12"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/64"	CH604R-12	2113A22	00000

Wear-Resistant Titanium Nitride (TiN)-Coated Steel

Image of Product. Front orientation. ZoomedIn view. Contains Annotated, MultipleImages. Rulers. High-Accuracy Rulers, Wear-Resistant Titanium Nitride (TiN)-Coated Steel.

Our most scratch- and wear-resistant rulers withstand the busiest machine shops. These rulers are about 30% harder than chrome-plated steel rulers, so they'll keep looking like new even if they constantly slide and scrape against your workbench.

							Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Accuracy	Wd.	Thk.		Each
Inch



		6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	1/2"	1/64"	19845A13	000000


		6"	1/32" (4/32"), 1/64" (8/64")	1/10" (1/10"), 1/100" (1/10")	-0.0035" to 0.004"	3/4"	3/64"	19845A17	00000
		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	1/2"	1/64"	19845A11	00000
		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	3/4"	3/64"	19845A15	00000
		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1/2"	1/64"	19845A12	00000


		Inch/Metric



				6"/150 mm	1/32" (4/32"), 1/64" (8/64")	1 mm (10 mm), 0.5 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	1/2"	1/64"	19845A19	00000


				6"/150 mm	1/32" (4/32"), 1/64" (8/64")	1 mm (10 mm), 0.5 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	3/4"	3/64"	19845A21	00000
				12"/300 mm	1/32" (4/32"), 1/64" (8/64")	1 mm (10 mm), 0.5 mm (10 mm)	-0.0035" to 0.005"/-0.09 mm to 0.13 mm	1/2"	1/64"	19845A2	00000
				12"/300 mm	1/32" (4/32"), 1/64" (8/64")	1 mm (10 mm), 0.5 mm (10 mm)	-0.0035" to 0.005"/-0.09 mm to 0.13 mm	1"	3/64"	19845A22	00000

Starrett High-Accuracy Combination Square Blades


Inch	Inch/Metric

Use these blades with Starrett High-Accuracy Combination Square Heads. They meet Fed. Spec. GGG-R-791, which establishes uniform standards for accuracy, graduations, and size. Blades are labeled with numeric increments that are less than 1" for quick reading. All have a corrosion-resistant satin chrome-plated finish that reduces glare and wear-resistant etched markings.

								Graduation
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Color	Color	Type		Each
Inch







				Satin Chrome-Plated Steel

				4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Silver	Black	Etched	1955A32	000000


				6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Silver	Black	Etched	1955A34	00000
				6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.002" to 0.004"	3/4"	5/64"	Silver	Black	Etched	1955A35	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Silver	Black	Etched	1955A36	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Silver	Black	Etched	1955A37	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	1955A41	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	1955A42	000000
				36"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	1955A51	000000


				Inch/Metric







								Satin Chrome-Plated Steel

								11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/-0.09 mm to 0.15 mm	1"	3/32"	Silver	Black	Etched	1955A44	000000

Magnetic High-Accuracy Rulers

Take machine-shop-accurate measurements while keeping your hands free. These rulers have magnets on both ends to cling to most metallic surfaces. Also known as machinists’ rules, they have the tightest tolerances we offer. They’re also our most precise, with graduations as small as _1/64", so you can trust them for even the tiniest dimensions.

Satin Chrome-Plated Steel

Image of Product. Front orientation. ZoomedIn view. Contains Annotated, MultipleImages. Rulers. Magnetic High-Accuracy Rulers.

Tough enough to handle most tasks, these rulers are chrome plated to resist rust. Their satin finish reduces glare for easy reading.

							Rulers
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Accuracy	Wd.	Thk.		Each
Inch



		6"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.004"	3/4"	3/64"	2077A21	000000


		12"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/64"	2077A22	00000
		24"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1 1/8"	3/64"	2077A23	00000
		36"	1/64" (8/64"), 1/32" (4/32")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1 1/8"	3/64"	2077A24	000000


		Inch/Metric



				6"/150 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.004"/-0.09 mm to 0.1 mm	3/4"	3/64"	2077A32	00000


				12"/300 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.005"/-0.09 mm to 0.13 mm	1"	3/64"	2077A33	00000
				24"/600 mm	1/32" (4/32"), 1/64" (8/64")	0.5 mm (10 mm), 1 mm (10 mm)	-0.0035" to 0.007"/-0.09 mm to 0.18 mm	1 1/8"	3/64"	2077A34	00000

Starrett High-Accuracy Combination Squares

Replace your try square, miter square, depth gauge, height gauge, center-point finder, and level. The blade on these squares meets Fed. Spec. GGG-R-791H, which establishes uniform standards for accuracy, graduations, and size. Blades are labeled with numeric increments that are less than 1" for quick reading.

Blades with Square Head


	Inch

Square head checks 90° angles.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation			Cast Iron Square Head		Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each		Each
Inch



		4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Steel	Satin	Chrome, Silver	Black	Etched	2 1/4"	2108A21	0000000	2107A21	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt for Square and Center Heads	1955A81	000000

Blades with Square Head and Center Head


	Inch

Square head checks 90° angles.

Center head identifies the center on pipes, rods, and shafts.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each
Inch



		4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Steel	Satin	Chrome, Silver	Black	Etched	2 1/4"	2108A11	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt for Square and Center Heads	1955A81	000000

Blades with Square Head with Built-In Level and Scriber


	Inch/Metric

Inch

Square head checks 90° angles.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head			Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each	Head Lg.		Each
Inch



		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	—	Silver	Black	Etched	2 13/32"	2108A44	0000000	—	———	0


		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	2 13/32"	2108A22	000000	2 13/32"	2107A22	0000000
		6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	2 13/32"	2108A28	000000	2 13/32"	2107A28	000000
		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A45	000000	—	———	0
		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A23	000000	3 5/8"	2107A23	000000
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A29	000000	3 5/8"	2107A29	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A25	000000	3 5/8"	2107A25	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A32	000000


		Inch/Metric



				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A26	000000	3 5/8"	2107A26	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	0000000
Replacement Lockbolt for Square and Center Heads	1955A82	00000
Replacement Lockbolt for Square, Center, and Protractor Heads	1955A83	0000

Blades with Square Head with Built-In Level, Center Head, and Scriber


	Inch

Square head checks 90° angles.

Center head identifies the center on pipes, rods, and shafts.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head			Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each	Head Lg.		Each
Inch



		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	2 13/32"	2107A12	0000000


		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A13	0000000	3 5/8"	2107A13	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	0000000
Replacement Lockbolt for Center Heads	1955A85	00000
Replacement Lockbolt for Square and Center Heads	1955A82	00000
Replacement Lockbolt for Square, Center, and Protractor Heads	1955A83	0000

Blades with Square Head with Built-In Level, Center Head, Protractor Head, and Scriber


	Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Etched—Etched graduation marks are wear resistant.

					Blade				Graduation		Cast Iron Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Color	Color	Type	Head Lg.		Each
Inch



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	2108A57	0000000


		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	2108A59	000000

Replacements for Squares

Blades with Square Head with Built-In Level, Center Head, Reversible Protractor Head, and Scriber


	Inch/Metric

Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head			Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each	Head Lg.		Each
Inch



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A51	0000000	—	———	0


		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A51	0000000
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A54	000000	—	———	0
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A54	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A53	000000	—	———	0
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A53	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A56	000000


		Inch/Metric



				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A55	000000	—	———	0


				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A57	000000

Replacements for Squares