Convert Pound square feet to Kilogram square millimetres
Convert Pound square feet (lb·ft²) to Kilogram square millimetres (kg·mm²) instantly and accurately.
Conversion Formula
kg·mm² = lb·ft² × 42140.11009
About Pound square feet
The pound square foot (lb·ft²) equals ≈0.04214 kg·m², the dominant imperial unit for machine and vehicle rotational inertias. Aircraft control-surface counterbalancing, propeller blade inertia, and turbocharger rotor dynamics are specified in lb·ft²; steam turbine discs and helicopter tail-rotor assemblies: 1-10 000 lb·ft². 1 lb·ft² ≈0.04214 kg·m² = 144 lb·in² ≈0.03108 slug·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
| Pound square feet (lb·ft²) | Kilogram square millimetres (kg·mm²) |
|---|---|
| 1 lb·ft² | 42140.1 kg·mm² |
| 2 lb·ft² | 84280.2 kg·mm² |
| 5 lb·ft² | 210701 kg·mm² |
| 10 lb·ft² | 421401 kg·mm² |
| 25 lb·ft² | 1053500 kg·mm² |
| 50 lb·ft² | 2107010 kg·mm² |
| 100 lb·ft² | 4214010 kg·mm² |