Inside Hole Micrometers
Find the inside diameter of cylinders and rings. These micrometers have a plain thimble, which relies on operator feel for accurate measurements.
124 series have solid steel extensions that attach at one end of the micrometer head.
823 series have lightweight tubular extensions that can attach at either end of the micrometer head.
| Measuring Range | Accuracy | Measuring Increments | Material | Number of Extension Rods | Extension Rod Dia. | Number of Heads | Head Travel | Includes | Manufacturer | Manufacturer Model Number | Each | |
124 Series—Plain Thimble | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2"-8" | ±0.0001" | 0.001" | Steel | 6 | 1/4" | 1 | 1/2" | __ | Starrett | 124AZ | 000000 | 0000000 |
| 2"-12" | ±0.0001" | 0.001" | Steel | 10 | 1/4" | 1 | 1/2" | __ | Starrett | 124BZ | 000000 | 000000 |
| 2"-32" | ±0.0001" | 0.001" | Steel | 10 | 1/4", 11/32" | 2 | 1/2", 1" | __ | Starrett | 124DZ | 000000 | 00000000 |
| 8"-32" | ±0.0001" | 0.001" | Steel | 4 | 11/32" | 1 | 1" | __ | Starrett | 124CZ | 000000 | 000000 |
823 Series—Plain Thimble | ||||||||||||
| 1.5"-8" | ±0.0001" | 0.001" | Steel | 5 | 3/8" | 1 | 1/2" | 5 1/2" Lg. Handle | Starrett | 823AZ | 000000 | 000000 |
| 1.5"-12" | ±0.0001" | 0.001" | Steel | 8 | 3/8" | 1 | 1/2" | 5 1/2" Lg. Handle | Starrett | 823BZ | 000000 | 000000 |
| 1.5"-32" | ±0.0001" | 0.001" | Steel | 10 | 3/8" | 2 | 1/2", 1" | 5 1/2" Lg. Handle | Starrett | 823FZ | 000000 | 00000000 |
| 4"-24" | ±0.0001" | 0.001" | Steel | 7 | 3/8" | 1 | 1" | __ | Starrett | 823CZ | 000000 | 000000 |
| 4"-32" | ±0.0001" | 0.001" | Steel | 8 | 3/8" | 1 | 1" | __ | Starrett | 823DZ | 000000 | 000000 |
| 4"-40" | ±0.0001" | 0.001" | Steel | 10 | 3/8" | 1 | 1" | __ | Starrett | 823EZ | 000000 | 000000 |
Collars for Inside Hole Micrometers
| Material | Manufacturer | Manufacturer Model Number | For Manufacturer Model Number | Each | |
| Steel | Starrett | PT01579 | 124AZ, 124BZ | 0000000 | 000000 |
Handles for Inside Hole Micrometers
Screw into your micrometer head to extend its reach for measuring deep holes.
| Handle Lg. | Manufacturer | Manufacturer Model Number | For Manufacturer Model Number | Each | |
| 6 1/2" | Starrett | 124H | 124AZ, 124BZ, 124DZ | 000000 | 000000 |
Starrett Telescoping Bore Gauge Sets
Spring tension forces two telescoping steel contacts to expand inside the bore; turn the screw to lock the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
| Number of Gauges | Measuring Range | Max. Dp. Measured | Material | Includes | Manufacturer Model Number | Each | |
| 4 | 5/16"-2 1/8" | 2" | Steel | One gauge with 5/16"-1/2" measuring range One gauge with 1/2"-3/4" measuring range One gauge with 3/4"-1 1/4" measuring range One gauge with 1 1/4"-2 1/8" measuring range | S579GZ | 000000 | 0000000 |
| 6 | 5/16"-6" | 2" | Steel | One gauge with 5/16"-1/2" measuring range One gauge with 1/2"-3/4" measuring range One gauge with 3/4"-1 1/4" measuring range One gauge with 1 1/4"-2 1/8" measuring range One gauge with 2 1/8"-3 1/2" measuring range One gauge with 3 1/2"-6" measuring range | S579HZ | 000000 | 000000 |
Starrett Telescoping Bore Gauges
Spring tension forces two telescoping steel contacts to expand inside the bore; turn the screw to lock the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
| Measuring Range | Max. Dp. Measured | Material | Handle Lg. | Manufacturer Model Number | Each | |
| 5/16"-1/2" | 2" | Steel | 2 7/8" | 579A | 000000 | 000000 |
| 1/2"-3/4" | 2" | Steel | 2 7/8" | 579B | 000000 | 00000 |
| 3/4"-1 1/4" | 2" | Steel | 2 7/8" | 579C | 000000 | 00000 |
| 1 1/4"-2 1/8" | 2" | Steel | 2 7/8" | 579D | 000000 | 00000 |
| 2 1/8"-3 1/2" | 2" | Steel | 2 7/8" | 579E | 000000 | 00000 |
| 3 1/2"-6" | 2" | Steel | 4" | 579F | 000000 | 00000 |
Economy Telescoping Bore Gauge Sets
Spring tension forces two telescoping steel contacts to expand inside the bore; turn the screw to lock the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
| Number of Gauges | Measuring Range | Material | Includes | Each | |
| 4 | 5/16"-2 1/8" | Chrome-Plated Brass, Steel | One gauge with 5/16"-1/2" measuring range One gauge with 1/2"-3/4" measuring range One gauge with 3/4"-1 1/4" measuring range One gauge with 1 1/4"-2 1/8" measuring range | 0000000 | 000000 |
| 6 | 5/16"-6" | Chrome-Plated Brass, Steel | One gauge with 5/16"-1/2" measuring range One gauge with 1/2"-3/4" measuring range One gauge with 3/4"-1 1/4" measuring range One gauge with 1 1/4"-2 1/8" measuring range One gauge with 2 1/8"-3 1/2" measuring range One gauge with 3 1/2"-6" measuring range | 0000000 | 000000 |
Starrett Small-Bore Gauges
Insert into small bores, slots, grooves, and recesses and turn the knob on the handle to expand the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
Full-ball gauges are best for deep bores.
Half-ball gauges are best for flat, shallow areas.
| Measuring Range | Max. Dp. Measured | Material | Manufacturer Model Number | Each | |
Full Ball | |||||
|---|---|---|---|---|---|
| 0.125"-0.2" | 2 1/2" | Steel | 829A | 000000 | 000000 |
| 0.2"-0.3" | 2 1/2" | Steel | 829B | 000000 | 00000 |
| 0.3"-0.4" | 2.7" | Steel | 829C | 000000 | 00000 |
| 0.4"-0.5" | 3" | Steel | 829D | 000000 | 00000 |
Half Ball | |||||
| 0.125"-0.2" | 2" | Steel | 831A | 000000 | 00000 |
| 0.2"-0.3" | 3" | Steel | 831B | 000000 | 00000 |
| 0.3"-0.4" | 3" | Steel | 831C | 000000 | 00000 |
| 0.4"-0.5" | 3" | Steel | 831D | 000000 | 00000 |
Starrett Small-Bore Gauge Sets
Insert into small bores, slots, grooves, and recesses and turn the knob on the handle to expand the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.
Full-ball gauges are best for deep bores.
Half-ball gauges are best for flat, shallow areas.
| Measuring Range | Material | Number of Gauges | Includes | Manufacturer Model Number | Each | |
Full Ball | ||||||
|---|---|---|---|---|---|---|
| 0.125"-0.5" | Steel | 4 | One full-ball gauge with 0.125"-0.200" measuring range and 2 1/2" max. depth One full-ball gauge with 0.200"-0.300" measuring range and 2 1/2" max. depth One full-ball gauge with 0.300"-0.400" measuring range and 2.7" max. depth One full-ball gauge with 0.400"-0.500" measuring range and 3" max. depth | S829EZ | 000000 | 0000000 |
Half Ball | ||||||
| 0.125"-0.5" | Steel | 4 | One half-ball gauge with 0.125"-0.200" measuring range and 2" max. depth One half-ball gauge with 0.200"-0.300" measuring range and 3" max. depth One half-ball gauge with 0.300"-0.400" measuring range and 3" max. depth One half-ball gauge with 0.400"-0.500" measuring range and 3" max. depth | S831EZ | 000000 | 000000 |
Economy Small-Bore Gauge Sets
Insert into small bores, slots, grooves, and recesses and turn the knob on the handle to expand the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts. The full-ball design makes these gauges good for measuring deep bores.
| Measuring Range | End Shape | Material | Number of Gauges | Includes | Each | |
| 0.125"-0.5" | Full Ball | Steel | 4 | One full-ball gauge with 0.125"-0.200" measuring range and 61/64" max. depth One full-ball gauge with 0.200"-0.300" measuring range and 1 3/64" max. depth One full-ball gauge with 0.300"-0.400" measuring range and 1 5/32" max. depth One full-ball gauge with 0.400"-0.500" measuring range and 1 19/64" max. depth | 0000000 | 000000 |
Mitutoyo Dial Bore Gauges
Measure the inside diameter of holes and cylindrical bores, as well as identify out-of-roundness problems. Switch between anvils to measure holes of different diameters. They have highly sensitive, wear-resistant jeweled bearings for a long service life.
Dial | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measuring Range | Accuracy | Measuring Increments | Max. Dp. Measured | Probe Type | Measurement per Dial Revolution | Material | Industry Designation | Dia. | Face Color | Number of Anvils | Manufacturer Model Number | Each | |
| 0.4"-0.7" | ±0.0002" | 0.0001" | 2.4" | B | 0.01" | Steel | AGD Group 2 | 2 1/4" | White | 8 | 526-123 | 000000000 | 0000000 |
| 0.7"-1.4" | ±0.00008" | 0.0001" | 4" | C | 0.01" | Steel | AGD Group 2 | 2 1/4" | White | 9 | 511-751 | 000000000 | 000000 |
| 1.4"-2.5" | ±0.00008" | 0.0001" | 6" | C | 0.01" | Steel | AGD Group 2 | 2 1/4" | White | 6 | 511-752 | 000000000 | 000000 |
| 2"-6" | ±0.00008" | 0.0001" | 6" | C | 0.01" | Steel | AGD Group 2 | 2 1/4" | White | 11 | 511-753 | 000000000 | 000000 |
Mitutoyo Dial Bore Gauge Sets
Set includes one dial head that fits onto three gauge bodies. Use these to measure the inside diameter of holes and cylindrical bores, as well as identify out-of-roundness problems. Switch between anvils to measure holes of different diameters. The dial head has highly sensitive, wear-resistant jeweled bearings for a long service life.
Dial | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measuring Range | Accuracy | Measuring Increments | Max. Dp. Measured | Probe Type | Measurement per Dial Revolution | Material | Industry Designation | Dia. | Face Color | Number of Anvils | Manufacturer Model Number | Each | |
| 0.7"-6" | ±0.00008" | 0.0001" | 4", 6" | C | 0.01" | Steel | AGD Group 2 | 2 1/4" | White | 26 | 511-932 | 00000000 | 000000000 |
Economy Dial Bore Gauges
Use these bore gauges to measure the inside diameter of holes and cylindrical bores, as well as identify out-of-roundness problems. Switch between anvils to measure bores of different diameters. All have highly sensitive, wear-resistant jeweled bearings for a long service life.
For technical drawings and 3-D models, click on a part number.
Dial | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measuring Range | Accuracy | Measuring Increments | Max. Dp. Measured | Probe Type | Measurement per Dial Revolution | Material | Industry Designation | Dia. | Face Color | Number of Anvils | Contact Point Material | Each | |
| 0.7"-1.5" | ±0.0009" | 0.0005" | 8" | A | 0.05" | Steel | AGD Group 2 | 2 1/4" | White | 8 | Carbide | 0000000 | 0000000 |
| 1.4"-6" | ±0.0009" | 0.0005" | 9" | C | 0.05" | Steel | AGD Group 2 | 2 1/4" | White | 15 | Carbide | 0000000 | 000000 |
| 2"-6" | ±0.0009" | 0.0005" | 9" | C | 0.05" | Steel | AGD Group 2 | 2 1/4" | White | 11 | Carbide | 0000000 | 000000 |
Mitutoyo Electronic Inside Hole Calipers
Short, narrow contacts allow these calipers to take hard-to-reach measurements, such as the dimensions of internal grooves and slots. They are IP67 rated for protection from dust and temporary water submersion. Each has a zero-set button which allows you to start measuring at any point.
Measuring Range | Accuracy | Measuring Increments | Contact Point | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | Metric | Inch | Metric | Inch | Metric | Max. Dp. Measured | Body Material | Batteries Included | Leg Lg. | Foot Lg. | Type | Head Dia. | Environmental Rating | Manufacturer Model Number | Each | |
| 0.2"-0.59" | 5 mm-15 mm | ±0.0008" | ±0.015 mm | 0.0002" | 0.005 mm | 1.37" | Steel | Yes | 1 3/8" | 0.094" | Ball | 0.024" | IP67 | 209-935 | 0000000 | 0000000 |
| 0.4"-1.18" | 10 mm-30 mm | ±0.0015" | ±0.03 mm | 0.0005" | 0.01 mm | 3.3" | Steel | Yes | 3 5/16" | 0.213" | Ball | 0.04" | IP67 | 209-936 | 0000000 | 000000 |
| 1.19"-1.97" | 30 mm-50 mm | ±0.0015" | ±0.03 mm | 0.0005" | 0.01 mm | 3.3" | Steel | Yes | 3 5/16" | 0.201" | Ball | 0.04" | IP67 | 209-938 | 0000000 | 000000 |
| 1.98"-2.76" | 50 mm-70 mm | ±0.0015" | ±0.03 mm | 0.0005" | 0.01 mm | 3.3" | Steel | Yes | 3 5/16" | 0.48" | Ball | 0.04" | IP67 | 209-940 | 0000000 | 000000 |
| Replacement Batteries (2/Pkg.) | 0000000 | Pkg. | 000000 |
Mitutoyo Electronic Inside Hole Calipers with Calibration Certificate
These calipers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. Short, narrow contacts allow them to take hard-to-reach measurements, such as the dimensions of internal grooves and slots. All are IP67 rated for protection from dust and temporary water submersion. They have a zero-set button which allows you to start measuring at any point.
Measuring Range | Accuracy | Measuring Increments | Contact Point | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | Metric | Inch | Metric | Inch | Metric | Max. Dp. Measured | Body Material | Batteries Included | Leg Lg. | Foot Lg. | Type | Head Dia. | Environmental Rating | Manufacturer Model Number | Each | |
| 0.2"-0.59" | 5 mm-15 mm | ±0.0008" | ±0.015 mm | 0.0002" | 0.005 mm | 1.37" | Steel | Yes | 1 3/8" | 0.094" | Ball | 0.024" | IP67 | 209-935 | 0000000 | 0000000 |
| 0.4"-1.18" | 10 mm-30 mm | ±0.0015" | ±0.03 mm | 0.0005" | 0.01 mm | 3.3" | Steel | Yes | 3 5/16" | 0.213" | Ball | 0.04" | IP67 | 209-936 | 0000000 | 000000 |
| 1.19"-1.97" | 30 mm-50 mm | ±0.0015" | ±0.03 mm | 0.0005" | 0.01 mm | 3.3" | Steel | Yes | 3 5/16" | 0.201" | Ball | 0.04" | IP67 | 209-938 | 0000000 | 000000 |
| 1.98"-2.76" | 50 mm-70 mm | ±0.0015" | ±0.03 mm | 0.0005" | 0.01 mm | 3.3" | Steel | Yes | 3 5/16" | 0.48" | Ball | 0.04" | IP67 | 209-940 | 0000000 | 000000 |
| Replacement Batteries (2/Pkg.) | 0000000 | Pkg. | 000000 |
Economy Electronic Inside Hole Calipers
Short, narrow contacts allow these calipers to take hard-to-reach measurements, such as the dimensions of internal grooves and slots.
Electronic Bore Gauges
Use this gauge to measure the inside diameter of holes and cylindrical bores, as well as identify out-of-roundness problems. Switch between anvils to measure bores of different diameters. It has zero-position memory, also known as absolute (ABS) positioning, which retains the measuring position when the gauge is turned off. A zero-set button allows you to start measuring at any point.