Description
Tesa Imicro Internal Micrometer Set — 3.5–6.5 mm Bore Measurement
The Tesa Imicro is a Swiss-made internal micrometer system engineered for small-bore measurement where a standard three-point bore mic or telescoping gauge simply won’t resolve fine enough detail. This set covers the 3.5–6.5 mm range across four individual heads, making it the right tool when you need direct, repeatable readings inside bores, valve guides, hydraulic spools, collet seats, and miniature bearing housings. Calibrated setting rings are included, so you can zero with confidence right off the bench — no chasing a master gauge across the workshop.
- Direct-reading thimble mechanism with 0.001 mm graduation — Reading in single-micron increments matters when you’re checking bore-to-shaft clearances or qualifying a ground hole against a tolerance band. The Imicro’s barrel and thimble geometry gives you a clean, unambiguous reading without conversion or interpolation, unlike telescoping gauges that require a separate outside mic to extract the number.
- Interchangeable measuring heads on a common extension stem — Each head mounts to the same shank, meaning the geometry of the contact points is consistent across the range. This matters for repeatability: you’re not switching between dissimilar tools and introducing technique variables when stepping from one size range to the next.
- Supplied setting rings (5T753 and 5T810 visible) — Setting rings are ground reference standards traceable to known dimensions. Using them to zero the mic before measurement eliminates accumulated errors from wear on the measuring faces and compensates for temperature variation, especially critical when working in a shop environment rather than a temperature-controlled metrology lab.
- Compact, carbide-tipped contact geometry — The slim profile of the Imicro head allows entry into bores that would reject the anvil geometry of a conventional internal mic or three-point head. Purpose-built for the sub-7 mm range where few precision instruments operate reliably.
- Ideal for: qualifying collet bores and collet chuck seats, checking valve guide internal diameters on engine rebuilds, verifying small hydraulic spool bores, inspecting miniature bearing housing fits, and production checking of drilled-and-reamed small-diameter holes on CNC turning centres and machining centres.
Condition
Used (Like New / Minimal Use, Full Set Intact)
This set presents in exceptional used condition. The measuring heads show only the lightest handling marks consistent with careful bench use — there is no visible wear on the measuring faces, no corrosion pitting on the thimble or barrel, and the knurled thimble grip retains its full texture. The carbide contact points show no chipping or flat-spotting. Both setting rings (5T753 and 5T810) are present and their ground reference surfaces are clean and free of scoring or raised burrs. The screwdriver/adjustment tool with its orange handle is included and undamaged. Mechanically, the thimble action on all four heads is smooth with no perceptible backlash or binding — these feel like a set that was pulled out infrequently and stored correctly rather than run hard in daily production. The original blue/cream plastic carry case is present and fully functional, with the moulded insert retaining all components securely. As with any used precision instrument, it is good practice to verify each head against its respective setting ring before committing measurements to a workpiece — a process that takes under two minutes per head and is standard toolroom procedure regardless of condition.
Included
- 4 x Tesa Imicro measuring heads (covering 3.5–6.5 mm range)
- 1 x Common extension stem / shank
- 2 x Ground setting rings (marked 5T753 and 5T810)
- 1 x Adjustment screwdriver (orange handle)
- 1 x Original Tesa carry case with moulded insert
Not Included
- Calibration certificate (none supplied — verify against setting rings before use)
Brand Information
Tesa is a Swiss metrology manufacturer founded in 1941 in Renens, near Lausanne, and is part of the Hexagon Manufacturing Intelligence group. Tesa occupies the same upper tier of the global precision measurement market as Mitutoyo, Mahr, and Sylvac — tools built to toolroom and metrology-lab standards rather than general trade use. Swiss manufacture carries genuine weight in this product category: Tesa’s internal mics, indicators, and gauge blocks are specified by aerospace, watchmaking, and precision engineering industries where measurement uncertainty directly affects part conformance. Buying Tesa used is a legitimate path to Swiss-grade accuracy at a working-shop price point.
Specifications
| Feature | Specification |
|---|---|
| Brand | Tesa (Tesa Technology, Switzerland) |
| Model / Part Number | Imicro — 00813409 |
| Type | Internal Micrometer Set (bore mic / hole mic) |
| Total Measuring Range | 3.5–6.5 mm (across four heads) |
| Graduation / Resolution | 0.001 mm (1 micron) |
| Number of Measuring Heads | 4 |
| Setting Standards Included | 2 x ground setting rings (5T753 and 5T810) |
| Measuring Face Material | Carbide-tipped contact points |
| Adjustment Tool | Included (screwdriver, orange handle) |
| Country of Origin | Switzerland |
| Case / Packaging | Original Tesa moulded plastic carry case |
| Condition | Used (Like New / Minimal Use) |
| Included Items | 4 x Imicro heads, 1 x stem, 2 x setting rings, 1 x adjustment screwdriver, original case |
| Not Included | Calibration certificate |
Keywords
Tesa Imicro, Tesa 00813409, Tesa internal micrometer, bore mic 3.5mm, hole micrometer set, small bore micrometer, Swiss internal micrometer, Tesa bore gauge, internal micrometer with setting ring, toolroom bore measurement, small bore gauge, precision internal mic
