Convert Kilogram square millimetres to Pound square inches
Convert Kilogram square millimetres (kg·mm²) to Pound square inches (lb·in²) instantly and accurately.
Conversion Formula
lb·in² = kg·mm² × 0.003417171898
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 Pound square inches
The pound square inch (lb·in²) equals ≈2.926 × 10⁻⁴ kg·m², the standard US customary unit for motor and machinery rotors. Rockwell Automation, Parker Hannifin, and Allied Motion servo sizing catalogs express rotor inertia in lb·in²; US machine-tool spindle and conveyor drive specifications use lb·in². High-speed spindle rotors: 5-50 lb·in². 1 lb·in² ≈2.926 × 10⁻⁴ kg·m² = 1/144 lb·ft².
Quick Reference Table
| Kilogram square millimetres (kg·mm²) | Pound square inches (lb·in²) |
|---|---|
| 1 kg·mm² | 0.00341717 lb·in² |
| 2 kg·mm² | 0.00683434 lb·in² |
| 5 kg·mm² | 0.0170859 lb·in² |
| 10 kg·mm² | 0.0341717 lb·in² |
| 25 kg·mm² | 0.0854293 lb·in² |
| 50 kg·mm² | 0.170859 lb·in² |
| 100 kg·mm² | 0.341717 lb·in² |