Starrett Gauge Blocks | McMaster-Carr

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Manufacturer

Starrett

System of Measurement

Number of Pieces

Shape

Certificate Type

Calibration Certificate Traceable to NIST

Material

Ceramic

Steel

Gauge Block Grade

Manufacturer Model Number

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

Export Control Classification Number (ECCN)

EAR99

REACH

Not Compliant

DFARS Specialty Metals

Exempt

RoHS

Not Compliant

Length

Height

Width

Number of Holes

Counterbore Diameter

17/32"

Hole Style

Counterbored

Unthreaded

Hole Center-to-Center

1 3/16"

1 1/2"

Squareness Tolerance

0.0001"

Total Number of Holes

Container Type

Hole Diameter

20 Products

Starrett Gauge Block Sets with Calibration Certificate

Use the Starrett gauge blocks in these sets individually or together to take precise measurements or calibrate your measuring tools. They are often used to mark layouts, align machine components, and check that parts are within tolerance. All have been laboratory calibrated and include NIST traceable certification with the tested measurements. The blocks are individually numbered for recalibration.

Each block has a grade per ASME B89.1.9. Grades are based on tolerance—the smaller the tolerance, the greater the accuracy. Grade 0 means these gauge blocks are our most accurate. They help verify that precise measuring instruments, such as micrometers and calipers, are taking accurate readings.

Use a gauge block holder (not included) to create a custom repeatable measurement by stacking multiple blocks together. To prevent your gauge block combinations from wearing down over time, add wear blocks (not included) on each end.

Inch


Rectangle	Square

Square—Square blocks have a hole that runs through their center. Stack multiple square blocks together and secure them with a rod (not included).

Grade 0 Gauge Block—Grade 0 gauge blocks are our most accurate. They help verify that precise measuring instruments, such as micrometers and calipers, are taking accurate readings.

Ceramic—Ceramic blocks are more resistant to wear and corrosion than steel blocks. They won’t expand or contract as temperatures change. Use them in cleanrooms—they’re nonmagnetic so they won’t pick up any iron or dust.

Steel—Steel blocks are the most common choice for gauge blocks.

	Material	Specs. Met		Each
Rectangle







	Grade 0 Gauge Block

	9	RS9.A1	One block each in sizes 0.0625", 0.100", 0.125", 0.200", 0.250", 0.300", 0.500", 1.000", and 2.000"	Steel	ASME B89.1.9	2305A1	0000000


	28	RS 28.A1	Nine blocks in sizes 0.010" to 0.090" in 0.01" increments Nine blocks in sizes 0.0201" to 0.0209" in 0.0001" increments Nine blocks in sizes 0.021" to 0.029" in 0.001" increments One block in size 0.02005"	Steel	ASME B89.1.9	2305A201	00000000
	34	RS34.A1	Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments Nine blocks in sizes 0.101" to 0.109" in 0.001" increments Nine blocks in sizes 0.110" to 0.190" in 0.01" increments One block each in sizes 0.100", 0.200", 0.300", 0.500", 1.000", 2.000", and 4.000"	Steel	ASME B89.1.9	2305A9	00000000
	34	RY 34.A1	Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments Nine blocks in sizes 0.101" to 0.109" in 0.001" increments Nine blocks in sizes 0.110" to 0.190" in 0.01" increments One block each in sizes 0.500", 1.000", 2.000", and 4.000" Three blocks in sizes 0.100" to 0.300" in 0.1" increments	Ceramic	ASME B89.1.9	2305A203	00000000
	81	RS81.A1	19 blocks in sizes 0.050" to 0.950" in 0.05" increments 49 blocks in sizes 0.101" to 0.149" in 0.001" increments Four blocks in sizes 1.000" to 4.000" in 1" increments Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments	Steel	ASME B89.1.9	2305A3	00000000
	81	RY 81.A1	19 blocks in sizes 0.050" to 0.950" in 0.05" increments 49 blocks in sizes 0.101" to 0.149" in 0.001" increments Four blocks in sizes 1.000" to 4.000" in 1" increments Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments	Ceramic	ASME B89.1.9	2305A204	00000000
	88	RS 88.A1	19 blocks in sizes 0.050" to 0.950" in 0.05" increments 49 blocks in sizes 0.101" to 0.149" in 0.001" increments Four blocks in sizes 1.000" to 4.000" in 1" increments Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments One block each in sizes 0.063", 0.078", 0.092", 0.100025", 0.10005", 0.100075", and 0.109"	Steel	ASME B89.1.9	2305A202	00000000
	88	RY 88.A1	19 blocks in sizes 0.050" to 0.950" in 0.05" increments 49 blocks in sizes 0.101" to 0.149" in 0.001" increments Four blocks in sizes 1.000" to 4.000" in 1" increments Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments One block each in sizes 0.063", 0.078", 0.092", 0.100025", 0.10005", 0.100075", and 0.109"	Ceramic	ASME B89.1.9	2305A205	00000000


	Square







					Grade 0 Gauge Block

					28	SS 28.A1	Nine blocks in sizes 0.010" to 0.090" in 0.01" increments Nine blocks in sizes 0.0201" to 0.0209" in 0.0001" increments Nine blocks in sizes 0.021" to 0.029" in 0.001" increments One block in size 0.02005"	Steel	ASME B89.1.9	2305A206	00000000


					81	SS 81.A1	19 blocks in sizes 0.050" to 0.950" in 0.05" increments 49 blocks in sizes 0.101" to 0.149" in 0.001" increments Four blocks in sizes 1.000" to 4.000" in 1" increments Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments	Steel	ASME B89.1.9	2305A207	00000000
					88	SS 88.A1	19 blocks in sizes 0.050" to 0.950" in 0.05" increments 49 blocks in sizes 0.101" to 0.149" in 0.001" increments Four blocks in sizes 1.000" to 4.000" in 1" increments Nine blocks in sizes 0.1001" to 0.1009" in 0.0001" increments One block each in sizes 0.063", 0.078", 0.092", 0.100025", 0.10005", 0.100075", and 0.109"	Steel	ASME B89.1.9	2305A208	00000000

Metric


Rectangle	Square

Square—Square blocks have a hole that runs through their center. Stack multiple square blocks together and secure them with a rod (not included).

Grade 0 Gauge Block—Grade 0 gauge blocks are our most accurate. They help verify that precise measuring instruments, such as micrometers and calipers, are taking accurate readings.

Steel—Steel blocks are the most common choice for gauge blocks.

	Material	Specs. Met		Each
Rectangle







	Grade 0 Gauge Block

	9	RS 9.MA1	One block each in sizes 1, 2, 2.25, 2.5, 3, 5, 10, 15, and 25 mm	Steel	ASME B89.1.9	2305A4	0000000


	45	RS 45.MA1	Nine blocks in sizes 1 to 9 mm in 1 mm increments Nine blocks in sizes 1.001 to 1.009 mm in 0.001 mm increments Nine blocks in sizes 1.01 to 1.09 mm in 0.01 mm increments Nine blocks in sizes 1.1 to 1.9 mm in 0.1 mm increments Nine blocks in sizes 10 to 90 mm in 10 mm increments	Steel	ASME B89.1.9	2305A209	00000000
	45	RY 45.MA1	Nine blocks in sizes 1 to 9 mm in 1 mm increments Nine blocks in sizes 1.001 to 1.009 mm in 0.001 mm increments Nine blocks in sizes 1.01 to 1.09 mm in 0.01 mm increments Nine blocks in sizes 1.1 to 1.9 mm in 0.1 mm increments Nine blocks in sizes 10 to 90 mm in 10 mm increments	Ceramic	ASME B89.1.9	2305A212	00000000
	88	RS 88.MA1	19 blocks in sizes 0.5 to 9.5 mm in 0.5 mm increments 49 blocks in sizes 1.01 mm to 1.49 mm in 0.01 mm increments Nine blocks in sizes 1.001 to 1.009 mm in 0.001 mm increments One block in size 1.0005 mm Ten blocks in sizes 10 to 100 mm in 10 mm increments	Steel	ASME B89.1.9	2305A85	00000000
	88	RY 88.MA1	19 blocks in sizes 0.5 to 9.5 mm in 0.5 mm increments 49 blocks in sizes 1.01 to 1.49 mm in 0.01 mm increments Nine blocks in sizes 1.001 to 1.009 mm in 0.001 mm increments One block in size 1.0005 mm Ten blocks in sizes 10 to 100 mm in 10 mm increments	Ceramic	ASME B89.1.9	2305A213	00000000
	112	RS 112.MA1	49 blocks in sizes 0.5 to 24.5 mm in 0.5 mm increments 49 blocks in sizes 1.01 to 1.49 mm in 0.01 mm increments Four blocks in sizes 25 to 100 mm in 25 mm increments Nine blocks in sizes 1.001 to 1.009 mm in 0.001 mm increments One block in size 1.0005 mm	Steel	ASME B89.1.9	2305A211	00000000


	Square







					Grade 0 Gauge Block

					88	S2S 88.MA1	19 blocks in sizes 0.5 mm to 9.5 mm in 0.5 mm increments 49 blocks in sizes 2.01 to 2.49 mm in 0.01 mm increments Nine blocks in sizes 2.001 to 2.009 mm in 0.001 mm increments One block in size 2.0005 mm Ten blocks in sizes 10 mm to 100 mm in 10 mm increments	Steel	ASME B89.1.9	2305A215	00000000


					112	S2S 112.MA1	49 blocks in sizes 0.5 to 24.5 mm in 0.5 mm increments 49 blocks in sizes 2.01 to 2.49 mm in 0.01 mm increments Four blocks in sizes 25 to 100 mm in 25 mm increments Nine blocks in sizes 2.001 to 2.009 mm in 0.001 mm increments One block in size 2.0005 mm	Steel	ASME B89.1.9	2305A216	00000000

Setup Blocks

Create setups with precise angles and accurate spacing for measuring, inspection, or machining. These blocks are precision ground to tight tolerances on all six faces, making them flat, square, and parallel. Made of hardened steel, they resist wear, so they’ll stay precise even with heavy use.

Starrett Blocks with 5 Holes Total

Image of Product. Front orientation. Contains Annotated. Setup Blocks. Setup Blocks , Total of 5 Holes.

				Tolerance						Hole
	Lg.	Wd.	Ht.	Lg.	Wd.	Ht.	Squareness	Parallel	Material	Style (No. of)	Dia.	Ctr.-to-Ctr. (A)	Ctr.-to-Ctr. (B)	Counterbore Dia.	Container Type		Each
Made in the U.S.



		1"	3"	2"	0.0001"	0.0001"	0.0001"	0.0001"	0.0001"	Hardened Steel	Unthreaded and Counterbored (5)	11/32"	1 1/2"	1 3/16"	17/32"	Metal Case	21275A201	0000000