Three Point Interal Micrometers
1. For through hole measuring
2.With extension rod for deep hole measuring
3.With set ring under 100mm
4.Contact points can be carbide or hardened steel
Size for single:
| Item No. | Range(mm) | Grad.(mm) | Accuracy | Setting rings(mm) | Extension rods | A(mm) | B(mm) | C(mm) |
| 422-006 | 6-8 | 0.001 | ±0.004 | 8 | 5.8x100 | 1.5 | 2.5 | 52 |
| 422-008 | 8-10 | 0.001 | ±0.004 | 8 | 5.8x100 | 1.5 | 2.5 | 52 |
| 422-010 | 10-12 | 0.001 | ±0.004 | 10 | 5.8x100 | 1.5 | 2.5 | 52 |
| 422-011 | 11-14 | 0.005 | ±0.004 | 14 | 10.8x100 | 2 | 4.5 | 78 |
| 422-014 | 14-17 | 0.005 | ±0.004 | 14 | 10.8x100 | 2 | 4.5 | 78 |
| 422-017 | 17-20 | 0.005 | ±0.004 | 20 | 10.8x100 | 2 | 4.5 | 78 |
| 422-020 | 20-25 | 0.005 | ±0.004 | 20 | 17x150 | 7 | 7 | 82 |
| 422-025 | 25-30 | 0.005 | ±0.004 | 30 | 17x150 | 7 | 7 | 82 |
| 422-030 | 30-35 | 0.005 | ±0.004 | 30 | 17x150 | 7 | 7 | 82 |
| 422-031 | 30-40 | 0.005 | ±0.004 | 30 | 23.5x150 | 2.5 | 11 | 97 |
| 422-035 | 35-40 | 0.005 | ±0.004 | 40 | 17x150 | 7 | 7 | 82 |
| 422-040 | 40-50 | 0.005 | ±0.005 | 40 | 23.5x150 | 2.5 | 11 | 97 |
| 422-050 | 50-60 | 0.005 | ±0.005 | 60 | 23.5x150 | 4 | 13 | 100 |
| 422-060 | 60-70 | 0.005 | ±0.005 | 60 | 23.5x150 | 4 | 13 | 100 |
| 422-070 | 70-80 | 0.005 | ±0.005 | 80 | 23.5x150 | 4 | 13 | 100 |
| 422-080 | 80-90 | 0.005 | ±0.005 | 80 | 23.5x150 | 4 | 13 | 100 |
| 422-090 | 90-100 | 0.005 | ±0.005 | 90 | 23.5x150 | 4 | 13 | 100 |
Size for sets:
| Item No. | Range(mm) | Individual range(mm) | Setting rings(mm) | Pcs/set | Extension rods |
| 422-406 | 6-12 | 6-8,8-10,10-12 | Ø8,Ø10 |
3 | 5.8x100 |
| 422-411 | 11-20 | 11-14,14-17,17-20 | Ø14,Ø20 | 3 | 10.8x100 |
| 422-420 | 20-40 | 20-25,25-30,30-25,35-40 | Ø25,Ø35 | 4 | 17x150 |
| 422-430 | 30-50 | 30-40,40-50 | Ø40 | 2 | 17x150 |
| 422-450 | 50-100 | 50-60,60-70,70-80,80-90,90-100 |
Ø60,Ø80 Ø90 |
5 | 17x150 |

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