A precision depth micrometer covering 0–150 mm with interchangeable extension rods for measuring shoulder depths, slot depths and step heights — Multi Trade Combines stocks Mitutoyo instruments at Guwahati, price on request.
A depth micrometer is a precision measuring instrument for determining the depth of a hole, slot, step or recess from a reference surface. Its flat, wide base sits stably on the workpiece surface while a measuring rod extends down into the feature being measured. The thimble and barrel reading mechanism gives depth to 0.01 mm resolution — the same mechanical reading principle as an outside micrometer, but configured for depth measurement.
The measuring range of a basic depth micrometer is typically 0–25 mm on a single spindle. Interchangeable extension rods extend this to 50 mm, 75 mm, 100 mm and 125 mm — giving a total range of 0–150 mm with a standard three-rod set. For deeper features, longer extension rod sets are available.
Mitutoyo depth micrometers are the benchmark for precision in Indian workshops. Multi Trade Combines is an authorised Mitutoyo dealer in Guwahati and stocks the 0–150 mm depth micrometer sets at our AT Road counter.
| Brand | Mitutoyo |
|---|---|
| Category | Measuring Tools |
| Key specs | 0–150 mm with extensions |
| Resolution | 0.01 mm standard |
| Base width | Flat reference base — typically 45 mm or 60 mm width |
| Extension rods | Interchangeable rods for 0–25, 25–50, 50–75, 75–100, 100–125, 125–150 mm |
| Availability | In stock — price on request |
Depth micrometers are part of a complete precision measurement set:
A depth micrometer measures the depth of blind holes, slots, steps, shoulders, keyways and recesses to an accuracy of 0.01 mm. It is used for verifying machined depths to drawing tolerances — for example, checking that a bearing housing step is exactly the right depth to give the correct axial location of a bearing, or that a keyway is the correct depth before fitting a key. It is also used in mould and die work to verify cavity depths. In a general engineering workshop in Guwahati or Dibrugarh, a depth micrometer is a standard quality-control instrument alongside outside and inside micrometers.
Both instruments measure depth, but a depth micrometer gives higher accuracy (0.01 mm vs typically 0.02 mm for a vernier depth gauge) and has a more stable flat base that seats evenly on the reference surface. Depth micrometers with interchangeable rods extend the range — a standard set covers 0–150 mm using three extension rods. A depth vernier is faster and more convenient for quick checks; a depth micrometer is used when the tolerance demands it. For ISO-grade machining, mould work and bearing fits, the depth micrometer is the correct instrument.