Convert Kilogram square millimetres to Tonne square metres
Convert Kilogram square millimetres (kg·mm²) to Tonne square metres (t·m²) instantly and accurately.
Conversion Formula
t·m² = kg·mm² × 1.000000000e-9
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.
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.
Quick Reference Table
| Kilogram square millimetres (kg·mm²) | Tonne square metres (t·m²) |
|---|---|
| 1 kg·mm² | 1 × 10-9 t·m² |
| 2 kg·mm² | 2 × 10-9 t·m² |
| 5 kg·mm² | 5 × 10-9 t·m² |
| 10 kg·mm² | 1 × 10-8 t·m² |
| 25 kg·mm² | 2.5 × 10-8 t·m² |
| 50 kg·mm² | 5 × 10-8 t·m² |
| 100 kg·mm² | 1 × 10-7 t·m² |