Convert Tonne square metres to Kilogram square millimetres
Convert Tonne square metres (t·m²) to Kilogram square millimetres (kg·mm²) instantly and accurately.
Conversion Formula
kg·mm² = t·m² × 1000000000
About Tonne square metres
The tonne square metre (t·m²) equals 1000 kg·m², used for large industrial rotors and heavy rotating machinery. A 60-tonne paper-machine calendar roll of 0.5 m radius has I ≈7.5 t·m²; synchronous hydro-generator rotors: 50-2000 t·m²; large marine propulsion shafts: 5-50 t·m². 1 t·m² = 1000 kg·m² ≈737.6 slug·ft² ≈23 730 lb·ft².
About Kilogram square millimetres
The kilogram square millimetre (kg·mm²) equals 10⁻⁶ kg·m², widely used in CAD software and precision mechanical engineering. SolidWorks, CATIA, and Siemens NX report mass moment of inertia in kg·mm² for gear blanks, pulley hubs, and precision spindle assemblies. Industrial small servo motor rotors: 100-10 000 kg·mm². 1 kg·mm² = 10⁻⁶ kg·m² = 10 g·cm² = 0.01 kg·cm².
Quick Reference Table
| Tonne square metres (t·m²) | Kilogram square millimetres (kg·mm²) |
|---|---|
| 1 t·m² | 1000000000 kg·mm² |
| 2 t·m² | 2 × 109 kg·mm² |
| 5 t·m² | 5 × 109 kg·mm² |
| 10 t·m² | 1 × 1010 kg·mm² |
| 25 t·m² | 2.5 × 1010 kg·mm² |
| 50 t·m² | 5 × 1010 kg·mm² |
| 100 t·m² | 1 × 1011 kg·mm² |