Insize 2921 Rotary Bore Gauge
The Insize 2921 Rotary Bore Gauge is designed to measure bore diameters where the opening is too small for a standard fixed-anvil gauge to pass through. Its rotary anvil rotates to a compact profile for insertion, then extends to full measuring position once inside the bore, allowing accurate diameter checks on bores with restricted access. Available in ranges such as 80-150mm (2921-150) and 3.2"-5.9" (2921-E150), the gauge is built for mechanical operation with a steel anvil contact and is designed to work with a dial indicator or dial comparator to complete the readout. This makes the 2921 series a strong fit for aerospace, automotive, and general manufacturing applications where bore access is limited but measurement accuracy still needs to meet demanding tolerances.
Key Features
- Rotary anvil design allows the gauge to pass through small bore openings and expand for measurement
- Delivers 2µm accuracy and 1µm repeatability (without dial indicator)
- Compatible with 0.01mm or 0.001mm graduation dial indicators, or a dial comparator
- Works with Insize setting rings (code 6312) for accurate calibration before use
- Steel anvil contact point built for durability in industrial environments
- Available in multiple ranges to fit a variety of restricted-access bore applications
Specifications
| Specification |
Detail |
| Measurement Ranges Available |
80-150mm; 3.2"-5.9" (model 2921-E150) |
| Accuracy (without dial indicator) |
2µm |
| Repeatability (without dial indicator) |
1µm |
| Anvil Type |
Rotary, for bores with small openings |
| Contact Point Material |
Steel |
| Minimum Opening Diameter (d) |
57mm when bore diameter D ≤ 95mm; d = D-38 when D > 95mm |
| Compatible Dial Indicator Graduations |
0.01mm or 0.001mm |
| Compatible Setting Ring |
Insize setting ring (code 6312), sold separately |
| Operation Type |
Mechanical |
Items Included
- Insize rotary bore gauge in the selected range
- Fitted storage/carrying case
- Instruction manual
Insize 2921 Rotary Bore Gauge Data Sheet
