Starrett Gauge Blocks | McMaster-Carr

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Manufacturer

Starrett

Number of Pieces

112

Certificate Type

Calibration Certificate Traceable to NIST

System of Measurement

Shape

Manufacturer Model Number

Material

Gauge Block Grade

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

REACH

RoHS

19 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.

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

Steel blocks are the most common choice. 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.

Inch

Rectangular

Square

Rectangular
Number of Pieces	Manufacturer Model Number	Includes	Material	Specifications Met		Each
Grade 0
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	000000	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	00000000	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	000000	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	00000000	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	000000	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	00000000	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	00000000	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	00000000	00000000
Square
Grade 0
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	00000000	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	00000000	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	00000000	00000000

Metric

Rectangular

Square

Rectangular
Number of Pieces	Manufacturer Model Number	Includes	Material	Specifications Met		Each
Grade 0
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	000000	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	00000000	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	00000000	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	0000000	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	00000000	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	00000000	00000000
Square
Grade 0
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	00000000	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	00000000	00000000