Hand Tools
Inside and depth gages
Inside dimensions, hole depth, slots and steps
These instruments measure the depth of holes, slots, steps and cavities, as well as inside diameters.
They come in electronic (with data output and hardened base), dial (quick reading by dial), vernier (battery-free) and micrometer (highest accuracy) types.
The hardened and ground base seats perfectly on the part for reliable, repeatable measurement.
Main features
Measures the depth of holes, slots and steps
Hardened and ground base
Electronic, dial and vernier models
Brand
Typical applications
- Hole depth measurement
- Slot and cavity depth
- Step measurement
- Bead height control
- Inspection of machined parts
- Tolerance verification
- Metrology laboratory
- Quality control
- Maintenance and tooling
Featured products
| Product | Type | Description | Ranges |
|---|---|---|---|
| 3753B | Electronic depth gage | IP67 protection, data output, and hardened base; a fast and accurate method for depth of holes, slots, and recesses. 7" and 12" extension bases for large openings. | 0–6" to 0–32" (150–300 mm base) |
| 643 / 644 | Dial depth gage | Direct dial reading on a hardened and ground 2½" base; the fastest and most convenient within its range. | 0–6" · 0–12" (150–300 mm) |
| 236 / 237 | Vernier and rule depth gage | Direct reading on a ground base, no battery; for depth of holes, slots, and steps. | 6" (150 mm) · 12" (300 mm) |
| 440 / 445 / 449 | Depth micrometer | Hardened base of 2½–6" with interchangeable rods for maximum accuracy; wireless version available. | 0–3" a 0–9" |
| 829 | Small hole gage | Split-ball or full-ball contacts; ideal for accurately measuring small holes, slots, and cavities (read with a micrometer). | Small hole gage set |
| 229 / 579 | Telescoping gage | 229 with a telescoping arm and 579 self-centering two-arm with uniform tension; they determine the actual size of holes and slots (read with a micrometer). | 5⁄16"–6" (8–150 mm) |
| 270 / 269A | Taper gage | Hardened, ground steel blade graduated in thousandths of an inch or 0.02 mm for sizing holes, slots and recesses. | Depends on graduation |
| Accessories | Depth and inside gage accessories | Extension bases (7" and 12"), rods, contacts and spare parts. | — |
Note: The data shown is for reference only and may vary depending on the model, the manufacturer and the conditions of use.
Related products
CalipersOutside, inside, depth and step measurement, with digital or vernier reading.
MicrometersHigh-precision outside measurement, with carbide faces and electronic models.
Indicators and dial gagesDial and digital indicators for tolerance verification.
Bore gagesInside diameter measurement, including 3-point AccuBore.
SquaresSquareness and right-angle verification in the shop.