6 material differences · fewer than 12
Tractor oneFord NAA1953–1954No measured PTO figureTractor twoInternational Harvester B-2501955–1961No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1953–1954; 1955–1961). The figures below are side by side so you can judge them yourself; each says whether it was measured, claimed or declared by its source.
Field by field
6 material differences · 5 fields identical or within 5%, which is not counted as material
| Field | NAA | B-250 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 30.0 hp | 29.6 hp | — |
| Engine declared | — | INTERNATIONAL HARVESTER BD-144 | — |
| Displacement declared | — | 2.36 L | — |
| Maximum torque declared | — | 105 lb·ft · 142 N·m | — |
| Transmission | |||
| Top speed declared | 12.4 mph · 20 km/h | 12.4 mph · 20 km/h | — |
| Hydraulics & hitch | |||
| Pump flow declared | 2.7–6.0 gpm · 10.2–22.7 L/min | 5.0 gpm · 18.9 L/min | differs |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 2,842 lb · 1,289 kg | 3,333 lb · 1,512 kg | +17% B-250 |
| Wheelbase declared | 73.9 in · 1,876 mm | 74.1 in · 1,883 mm | — |
| Length declared | 120.7 in · 3,067 mm | 151.4 in · 3,845 mm | +25% B-250 |
| Width declared | 64.8–86.0 in · 1,645–2,184 mm | 63.8 in · 1,620 mm | differs |
| Height, over the steering wheel declared | 57.2 in · 1,454 mm | 59.2 in · 1,503 mm | — |
| Ground clearance declared | 20.9 in · 530 mm | 15.6 in · 397 mm | +34% NAA |
| Turning radius, braked declared | — | 10.2 ft · 3.12 m | — |
| Fuel tank declared | 61.3 qt · 58 L | 41.2 qt · 39.0 L | +49% NAA |
Ford NAA sources
Source
- Source: Traktorenlexikon, “Ford NAA”
International Harvester B-250 sources
Source
- Source: Traktorenlexikon, “IHC B-250”
- Source: Traktorenlexikon, “McCormick B-250”