Gauge Blocks



A true source of measurement, use these gauge blocks to calibrate measuring equipment, mark precise layouts, or position your fixture or machine components just right. All blocks include a certificate of compliance to certify their sizes are within tolerance. The certificate also lists when each block will require 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 gauge blocks are our most accurate. They help verify that precise measuring instruments, such as micrometers and calipers, are taking accurate readings. Grade AS-1 gauge blocks have a slightly higher tolerance. They’re the most common grade of gauge block.
Square blocks have a hole that runs through their center. Stack multiple square blocks together and secure them with a rod (not included).
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.
Use a gauge block holder (not included) to create a custom repeatable measurement by stacking multiple blocks together.
Add wear blocks (not included) on each end of your gauge block combinations to prevent them from wearing down over time.
For technical drawings and 3-D models, click on a part number.
Gauge Size | Gauge Size Tolerance | Lg. | Wd. | Manufacturer | Material | Specifications Met | Each | |
Rectangular | ||||||||
---|---|---|---|---|---|---|---|---|
Grade 0 | ||||||||
0.05" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.0625" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.0781" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.10005" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1001" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1002" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1004" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1005" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.104" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.105" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.106" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.108" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.109" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.11" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.111" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.112" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.116" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.117" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.118" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.119" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.12" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.122" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.123" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.124" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.125" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.126" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.129" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.13" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.136" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.137" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.138" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.14" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.141" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.142" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.143" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.144" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.146" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.147" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.148" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.149" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.15" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.2" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.25" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.3" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.35" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.4" | -0.000005" to 0.000005" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.45" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.5" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.55" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.65" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.7" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.75" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.8" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.9" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
1" | -0.000006" to 0.000006" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
4" | -0.00012" to 0.00012" | 1.378" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.5mm | -0.00014mm to 0.00014mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
1mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
1.4mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
1.5mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
2mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
3mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
4mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
5mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
6mm | -0.00012mm to 0.00012mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
10mm | -0.00012mm to 0.00012mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
11.5mm | -0.00014mm to 0.00014mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
13mm | -0.00014mm to 0.00014mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
20mm | -0.00014mm to 0.00014mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
21mm | -0.00014mm to 0.00014mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
25mm | -0.00014mm to 0.00014mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
40mm | -0.0002mm to 0.0002mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
50mm | -0.0002mm to 0.0002mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
75mm | -0.00025mm to 0.00025mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
100mm | -0.0003mm to 0.0003mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
Grade AS-1 | ||||||||
0.03125" | -0.00012" to 0.00012" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.114" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.117" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.119" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.135" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.138" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.143" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.147" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.149" | -0.000008" to 0.000008" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.8" | -0.00012" to 0.00012" | 1.181" | 0.35" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.5mm | -0.0003mm to 0.0003mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
1.3mm | -0.0002mm to 0.0002mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
1.5mm | -0.0002mm to 0.0002mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
3mm | -0.0002mm to 0.0002mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
8mm | -0.0002mm to 0.0002mm | 30mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
13mm | -0.0003mm to 0.0003mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
14mm | -0.0003mm to 0.0003mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
20mm | -0.0003mm to 0.0003mm | 35mm | 9mm | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
Square | ||||||||
Grade 0 | ||||||||
0.05" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.0625" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.125" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.15" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.18" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.2" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.25" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.3" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.35" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.4" | -0.000005" to 0.000005" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.5" | -0.000006" to 0.000006" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
0.75" | -0.000006" to 0.000006" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
1" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
2" | -0.0001" to 0.0001" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
Grade AS-1 | ||||||||
0.05" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.0625" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.1" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.2" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.25" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.35" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.4" | -0.000008" to 0.000008" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
0.5" | -0.00012" to 0.00012" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 00000 |
1" | -0.00016" to 0.00016" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
2" | -0.0002" to 0.0002" | 0.95" | 0.95" | Mitutoyo | Ceramic | ASME B89.1.9 | 00000000 | 000000 |
Mitutoyo Gauge Block Sets with Calibration Certificate



Use the Mitutoyo 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 come with a certificate traceable to NIST to certify they were calibrated in a lab and meet tight tolerances. The blocks are individually numbered for recalibration.
Put multiple gauge blocks together in a gauge holder (not included) to create a custom repeatable measurement. Add wear blocks (not included) on each end to prevent your gauge block combinations from wearing down over time.
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 gauge blocks are our most accurate. They help verify that precise measuring instruments, such as micrometers and calipers, are taking accurate readings. Grade AS-1 gauge blocks have a slightly higher tolerance. They’re the most common grade of gauge block.
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.
Number of Pieces | Manufacturer Model Number | Includes | Material | Specifications Met | Each | |
Inch | ||||||
---|---|---|---|---|---|---|
Grade 0 | ||||||
35 | 516-314-26 | 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" One block in size 0.10005" Three blocks in sizes 0.100" to 0.300" in 0.1" increments | Ceramic | ASME B89.1.9 | 0000000 | 000000000 |
81 | 516-302-26 | 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 | 0000000 | 00000000 |
Grade AS-1 | ||||||
35 | 516-315-26 | 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" One block in size 0.10005" Three blocks in sizes 0.100" to 0.300" in 0.1" increments | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
81 | 516-303-26 | 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 | 0000000 | 00000000 |
Metric | ||||||
Grade 0 | ||||||
47 | 516-358-26 | 24 blocks in sizes 1 to 24 mm in 1 mm increments Four blocks in sizes 25 to 100 mm in 25 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 One block in size 1.005 mm | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
56 | 516-354-26 | 24 blocks in sizes 1 to 24 mm in 1 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 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 One block in size 0.5 mm | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
87 | 516-346-26 | 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 Ten blocks in sizes 10 to 100 mm in 10 mm increments | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
103 | 516-342-26 | 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 One block in size 1.005 mm | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
112 | 516-338-26 | 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 | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
Grade AS-1 | ||||||
47 | 516-359-26 | 24 blocks in sizes 1 to 24 mm in 1 mm increments Four blocks in sizes 25 to 100 mm in 25 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 One block in size 1.005 mm | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
112 | 516-339-26 | 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 | Ceramic | ASME B89.1.9 | 0000000 | 00000000 |
Mitutoyo Gauge Block Sets



Use the Mitutoyo 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 blocks include a certificate of compliance to certify their sizes are within tolerance. The certificate also lists when each block will require recalibration.
Put multiple gauge blocks together in a gauge holder (not included) to create a custom repeatable measurement. Add wear blocks (not included) on each end of your gauge block combinations to prevent them from wearing down over time.
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 gauge blocks are our most accurate. They help verify that precise measuring instruments, such as micrometers and calipers, are taking accurate readings. Grade AS-1 gauge blocks have a slightly higher tolerance. They’re the most common grade of gauge block.
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.

Number of Pieces | Manufacturer Model Number | Includes | Material | Each | |
Rectangular | |||||
---|---|---|---|---|---|
Grade 0 | |||||
35 | 516-314-26 | 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" One block in size 0.10005" Three blocks in sizes 0.100" to 0.300" in 0.1" increments | Ceramic | 00000000 | 000000000 |
81 | 516-302-26 | 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 | 00000000 | 00000000 |
Grade AS-1 | |||||
35 | 516-315-26 | 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" One block in size 0.10005" Three blocks in sizes 0.100" to 0.300" in 0.1" increments | Ceramic | 00000000 | 00000000 |
81 | 516-303-26 | 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 | 00000000 | 00000000 |

Number of Pieces | Manufacturer Model Number | Includes | Material | Each | |
Rectangular | |||||
---|---|---|---|---|---|
Grade 0 | |||||
47 | 516-358-26 | 24 blocks in sizes 1 to 24 mm in 1 mm increments Four blocks in sizes 25 to 100 mm in 25 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 One block in size 1.005 mm | Ceramic | 00000000 | 000000000 |
56 | 516-354-26 | 24 blocks in sizes 1 to 24 mm in 1 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 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 One block in size 0.5 mm | Ceramic | 00000000 | 00000000 |
87 | 516-346-26 | 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 Ten blocks in sizes 10 to 100 mm in 10 mm increments | Ceramic | 00000000 | 00000000 |
103 | 516-342-26 | 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 One block in size 1.005 mm | Ceramic | 00000000 | 00000000 |
112 | 516-338-26 | 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 | Ceramic | 00000000 | 00000000 |
Grade AS-1 | |||||
47 | 516-359-26 | 24 blocks in sizes 1 to 24 mm in 1 mm increments Four blocks in sizes 25 to 100 mm in 25 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 One block in size 1.005 mm | Ceramic | 00000000 | 00000000 |
56 | 516-355-26 | 24 blocks in sizes 1 to 24 mm in 1 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 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 One block in size 0.5 mm | Ceramic | 00000000 | 00000000 |
87 | 516-347-26 | 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 Ten blocks in sizes 10 to 100 mm in 10 mm increments | Ceramic | 00000000 | 00000000 |
103 | 516-343-26 | 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 One block in size 1.005 mm | Ceramic | 00000000 | 00000000 |
112 | 516-339-26 | 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 | Ceramic | 00000000 | 00000000 |
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.
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.




Number of Pieces | Manufacturer Model Number | Includes | Material | Specifications Met | Each | |
Rectangular | ||||||
---|---|---|---|---|---|---|
Grade 0 | ||||||
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 | 000000000 |
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 | 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 |




Number of Pieces | Manufacturer Model Number | Includes | Material | Specifications Met | Each | |
Rectangular | ||||||
---|---|---|---|---|---|---|
Grade 0 | ||||||
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 | 000000000 |
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 |