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
Measure the diameter of small holes, grooves, and recesses. These gauges help you find deviations in size or roundness that can cause precision parts, such as engine or valve cylinders, to wear quickly or run poorly. They have a full-ball probe, which has a 360° contact surface that’s easy to center in tight spaces. Compared to gauges with an anvil, spring-loaded contact, or half-ball probe, they’re less likely to tilt inside a bore and skew measurements.
Insert the probe into a bore and turn the knob on the handle to expand the contacts. Measure the distance across the contacts with a micrometer to find the bore diameter.
Measuring Range | Material | Number of Gauges | Includes | Each | |
Full-Ball Small Bore | |||||
---|---|---|---|---|---|
0.125"-0.5" | 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 |
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 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 |
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 |
Caliper-Style Inside Hole Micrometers
The jaws on these micrometers work like caliper jaws to precisely measure inner diameters. These micrometers have a friction thimble with a constant-force mechanism, so they stop tightening once both jaws touch the sides for repeatable measurements. When the jaws stop tightening, the thimble continues turning with resistance, preventing overtightening. Use the included setting ring to calibrate and verify the accuracy of these micrometers.
Micrometers with pointed tips help you measure small shapes on your workpiece. Their thin tips fit into recesses and grooves, such as those found in keyways.
Micrometers with anvil tips are used to take quick ID measurements. A wide surface keeps the tips from catching on ridges or bumps, so it’s easy to position them across the diameter of your workpiece.
Measuring Range | Accuracy | Measuring Increments | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Inch | Metric | Inch | Metric | Inch | Metric | Body Material | Jaw Material | Batteries Included | Includes | Each | |
Pointed Tips | |||||||||||
Friction Thimble | |||||||||||
0.2"-1.2" | 5 mm-30 mm | ±0.0002" | ±0.005 mm | 0.00005" | 0.001 mm | Steel | Steel | Yes | Setting Ring | 000000 | 0000000 |
Anvil Tips | |||||||||||
Friction Thimble | |||||||||||
1"-2" | 25 mm-50 mm | ±0.0002" | ±0.005 mm | 0.00005" | 0.001 mm | Steel | Steel | Yes | Setting Ring | 000000 | 000000 |
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 |
Inside Hole Micrometers for Grooves
Reach into bores to measure the precise size and location of grooves. These micrometers have two discs on their measuring spindle to find a groove’s edge. Slide the spindle into your bore, press the discs against the wall and into the groove, and twist the thimble to measure the distance between the two discs. A speeder knob moves the measuring spindle more quickly toward or away from your groove, without turning the thimble repeatedly. When the spindle touches the groove you’re measuring, it will stop tightening, but the speeder knob will continue turning with a clicking sound. The spindle doesn’t rotate, so the contact points won’t spin or slip out of a groove.
Measuring Range | |||||||||
---|---|---|---|---|---|---|---|---|---|
Inside | Outside | Accuracy | Measuring Increments | Material | Overall Lg. | Manufacturer | Manufacturer Model Number | Each | |
Ratchet-Stop Thimble—Nonrotating Spindle | |||||||||
0.055"-1.05" | 0"-1" | ±0.0004" | 0.001" | Steel | 9 1/2" | Mitutoyo | 146-232 | 0000000 | 0000000 |
1.05"-2.05" | 1"-2" | ±0.0004" | 0.001" | Steel | 9 1/2" | Mitutoyo | 146-233 | 0000000 | 000000 |
2.05"-3.05" | 2"-3" | ±0.0004" | 0.001" | Steel | 9 1/2" | Mitutoyo | 146-234 | 0000000 | 000000 |
3.05"-4.05" | 3"-4" | ±0.0004" | 0.001" | Steel | 9 1/2" | Mitutoyo | 146-235 | 0000000 | 000000 |
Economy Inside Hole Micrometers
Measure the inside diameter of cylinders and rings. These micrometers have a plain thimble that turns freely without friction or a stopping device. It relies on user feel for accurate measurements. All include steel extensions that you can attach to one end of the micrometer head.
Mitutoyo Electronic Inside Hole Micrometers
With an LCD screen, these micrometers make it easy to read inside diameter measurements taken from cylinders and rings. Place the micrometer inside your bore, then turn the thimble until the spindle makes contact with both sides. For an accurate reading, stop turning as soon as you feel resistance on the thimble.
USB data cables (sold separately) connect micrometers directly to your PC.
10-pin data cables (sold separately) connect micrometers to a Mitutoyo miniprocessor or multiplexer.
Wireless data transmitters and receivers (sold separately) let you send data from micrometers to your PC without a cable.
Measuring Range | Accuracy | Measuring Increments | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Inch | Metric | Inch | Metric | Inch | Metric | Material | Number of Extension Rods | Extension Rod Dia. | Number of Heads | Head Travel | Batteries Included | Manufacturer Model Number | Each | |
303 Series—Plain Thimble | ||||||||||||||
8"-40" | 204 mm-1,016 mm | ±0.0015" | ±0.040 mm | 0.0001" | 0.001 mm | Steel | 6 | 5/8" | 1 | 1" | Yes | 339-303 | 0000000 | 000000000 |
Mitutoyo Inside Hole Micrometers
Find the inside diameter of cylinders and rings. Rotate the plain thimble until it fits snugly inside the space you’re measuring. These micrometers rely on the operator to determine a secure fit to take accurate measurements. Attach one of the included extension rods to the micrometer head to measure in hard-to-reach spaces.