Convert Poundal feet to Gram-force millimetres
Convert Poundal feet (pdl·ft) to Gram-force millimetres (gf·mm) instantly and accurately.
Conversion Formula
gf·mm = pdl·ft × 4297.095348
About Poundal feet
The poundal foot (pdl·ft) equals ≈ 0.04214 N·m, the torque unit of the absolute foot-pound-second system, where force is in poundals (1 pdl = 1 lb·ft/s²) rather than pound-force. It appeared in pre-SI British and American engineering texts and NACA aerodynamic stability reports alongside slug inertia values. 1 pdl·ft = 0.45359237 × 0.3048² N·m ≈ 0.04214 N·m ≈ 0.3730 lbf·in.
About Gram-force millimetres
The gram-force millimetre (gf·mm) equals 9.80665 × 10⁻⁶ N·m, the natural unit for precision micro-mechanisms. Swiss watchmaking datasheets list hairspring and balance-wheel detent torques in gf·mm; micro-servo holding torques, precision force gauge spring calibration, and miniature dental handpiece torque limits also fall in this range. A typical watch hairspring torque is 0.1-5 gf·mm. 1 gf·mm = 9.80665 × 10⁻⁶ N·m = 100 dyn·cm = 0.1 gf·cm.
Quick Reference Table
| Poundal feet (pdl·ft) | Gram-force millimetres (gf·mm) |
|---|---|
| 1 pdl·ft | 4297.1 gf·mm |
| 2 pdl·ft | 8594.19 gf·mm |
| 5 pdl·ft | 21485.5 gf·mm |
| 10 pdl·ft | 42971 gf·mm |
| 25 pdl·ft | 107427 gf·mm |
| 50 pdl·ft | 214855 gf·mm |
| 100 pdl·ft | 429710 gf·mm |