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 |
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 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 |
Starrett 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.
Collars (sold separately) extend a micrometer’s measuring range. Handles (sold separately) screw into a micrometer head to extends its reach for measuring deep holes.
| Measuring Range | Accuracy | Measuring Increments | Material | Number of Extension Rods | Extension Rod Dia. | Number of Heads | Head Travel | Includes | Manufacturer Model Number | Each | |
124 Series—Plain Thimble | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2"-8" | ±0.0001" | 0.001" | Steel | 6 | 1/4" | 1 | 1/2" | __ | 124AZ | 000000 | 0000000 |
| 2"-12" | ±0.0001" | 0.001" | Steel | 10 | 1/4" | 1 | 1/2" | __ | 124BZ | 000000 | 000000 |
| 2"-32" | ±0.0001" | 0.001" | Steel | 10 | 1/4", 11/32" | 2 | 1/2", 1" | __ | 124DZ | 000000 | 00000000 |
| 8"-32" | ±0.0001" | 0.001" | Steel | 4 | 11/32" | 1 | 1" | __ | 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 | 823AZ | 000000 | 000000 |
| 1.5"-12" | ±0.0001" | 0.001" | Steel | 8 | 3/8" | 1 | 1/2" | 5 1/2" Lg. Handle | 823BZ | 000000 | 000000 |
| 1.5"-32" | ±0.0001" | 0.001" | Steel | 10 | 3/8" | 2 | 1/2", 1" | 5 1/2" Lg. Handle | 823FZ | 000000 | 000000 |
| 4"-24" | ±0.0001" | 0.001" | Steel | 7 | 3/8" | 1 | 1" | __ | 823CZ | 000000 | 000000 |
| 4"-32" | ±0.0001" | 0.001" | Steel | 8 | 3/8" | 1 | 1" | __ | 823DZ | 000000 | 000000 |
| 4"-40" | ±0.0001" | 0.001" | Steel | 10 | 3/8" | 1 | 1" | __ | 823EZ | 000000 | 000000 |
Starrett Depth Gauges
Reach deep into small holes and slots for precise depth measurements. This gauge has a rod to measures the depth of recesses where the blade won’t fit. The blade has a hook which grabs the edge of an object for easy alignment. Markings are etched for wear resistance.
Graduation Marks (Numeric Increments) | Measuring Blade | Base | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Angle Measured | Includes | Measuring Range | Front Right | Back Left | Tip Wd. | Wd. | Wd. | Material | Wd. | Lg. | Color | Graduation Color | Overall Ht. | Features | Mfr. Model No. | Each | |
Bottom to Top/Top to Bottom Reading Direction | ||||||||||||||||||
| 6" | 30°, 45°, 60° | 6" Lg. × 5/64" Dia. Steel Rod | 0"-4 1/2" | 64ths (1") | 32nds (1") | 0.47" | 0.19" | 3/16" | Steel | 2 5/8" | 1 9/16" | Silver | Black | 6" | Protractor | 236HB | 000000 | 0000000 |
Starrett Depth Micrometers
Measure the depth of holes, slots, shoulders, and projections by changing out the steel extension rods supplied in 1" incremental lengths. The thimble has a constant-force mechanism, so that once the spindle contacts the surface of the measured object, it will stop tightening. This ensures repeatable measurements and prevents over-tightening.
For technical drawings and 3-D models, click on a part number.
Micrometers | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | Extension Rods | Replacement Cases | ||||||||||||
| Measuring Range | Accuracy | Measuring Increments | Wd. | Lg. | Material | No. of | Lg. | Dia. | Overall Ht. | Manufacturer Model No. | Each | Each | ||
Ratchet Thimble | ||||||||||||||
| 0"-3" | ±0.0001" | 0.001" | 2 1/2" | 5/8" | Steel | 3 | 1", 2", 3" | 1/8" | 3 1/2" | 440Z-3RL | 000000 | 0000000 | 0000000 | 000000 |
| 0"-3" | ±0.0001" | 0.001" | 4" | 39/64" | Steel | 3 | 1", 2", 3" | 5/32" | 3 1/2" | 445BZ-3RL | 0000000 | 000000 | 000000 | 00 |
| 0"-6" | ±0.0001" | 0.001" | 2 1/2" | 5/8" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 1/8" | 3 1/2" | 440Z-6RL | 000000 | 000000 | 0000000 | 00000 |
| 0"-6" | ±0.0001" | 0.001" | 4" | 39/64" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 5/32" | 3 1/2" | 445BZ-6RL | 0000000 | 000000 | 000000 | 00 |
| 0"-6" | ±0.0001" | 0.001" | 6" | 39/64" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 5/32" | 3 1/2" | 445DZ-6RL | 0000000 | 000000 | 000000 | 00 |
| 0"-9" | ±0.0001" | 0.001" | 4" | 39/64" | Steel | 9 | 1", 2", 3", 4", 5", 6", 7", 8", 9" | 5/32" | 3 1/2" | 445BZ-9RL | 0000000 | 000000 | 000000 | 00 |
| 0mm-75mm | ±0.007 mm | 0.01mm | 63.5mm | 39/64" | Steel | 3 | 1", 2", 3" | 3.2mm | 3 1/2" | 440MZ-75RL | 0000000 | 000000 | 0000000 | 00000 |
| 0mm-150mm | ±0.007 mm | 0.01mm | 63.5mm | 39/64" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 3.2mm | 3 1/2" | 440MZ-150RL | 0000000 | 000000 | 0000000 | 00000 |
Starrett Depth Micrometers with Calibration Certificate
These micrometers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. Change out the steel extension rods supplied in 1" incremental lengths to measure the depth of holes, slots, shoulders, and projections. The thimble has a constant-force mechanism, so that once the spindle contacts the surface of the measured object, it will stop tightening. This ensures repeatable measurements and prevents over-tightening.
For technical drawings and 3-D models, click on a part number.
Micrometers | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | Extension Rods | Replacement Cases | ||||||||||||
| Measuring Range | Accuracy | Measuring Increments | Wd. | Lg. | Material | No. of | Lg. | Dia. | Overall Ht. | Manufacturer Model No. | Each | Each | ||
Ratchet Thimble | ||||||||||||||
| 0"-3" | ±0.0001" | 0.001" | 2 1/2" | 5/8" | Steel | 3 | 1", 2", 3" | 1/8" | 3 1/2" | 440Z-3RL | 0000000 | 0000000 | 0000000 | 000000 |
| 0"-3" | ±0.0001" | 0.001" | 4" | 39/64" | Steel | 3 | 1", 2", 3" | 5/32" | 3 1/2" | 445BZ-3RL | 0000000 | 000000 | 000000 | 00 |
| 0"-6" | ±0.0001" | 0.001" | 2 1/2" | 5/8" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 1/8" | 3 1/2" | 440Z-6RL | 0000000 | 000000 | 0000000 | 00000 |
| 0"-6" | ±0.0001" | 0.001" | 4" | 39/64" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 5/32" | 3 1/2" | 445BZ-6RL | 0000000 | 000000 | 000000 | 00 |
| 0"-6" | ±0.0001" | 0.001" | 6" | 39/64" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 5/32" | 3 1/2" | 445DZ-6RL | 0000000 | 000000 | 000000 | 00 |
| 0"-9" | ±0.0001" | 0.001" | 4" | 39/64" | Steel | 9 | 1", 2", 3", 4", 5", 6", 7", 8", 9" | 5/32" | 3 1/2" | 445BZ-9RL | 0000000 | 000000 | 000000 | 00 |
| 0mm-75mm | ±0.007 mm | 0.01mm | 63.5mm | 39/64" | Steel | 3 | 1", 2", 3" | 3.2mm | 3 1/2" | 440MZ-75RL | 0000000 | 000000 | 0000000 | 00000 |
| 0mm-150mm | ±0.007 mm | 0.01mm | 63.5mm | 39/64" | Steel | 6 | 1", 2", 3", 4", 5", 6" | 3.2mm | 3 1/2" | 440MZ-150RL | 0000000 | 000000 | 0000000 | 00000 |