NEMA motor frame sizes
Frames 56–449T · D, 2E, 2F, BA, U, N-W · HP per frame · suffix key
Foot-mounted frames, NEMA MG 1 — all dimensions in inches
| Frame | D | 2E | 2F | BA | H | U | N-W | HP 1800 |
|---|---|---|---|---|---|---|---|---|
| 56 | 3.50 | 4.88 | 3.00 | 2.75 | 0.34 | 0.625 | 1.88 | 1/4–1 |
| 143T | 3.50 | 5.50 | 4.00 | 2.25 | 0.34 | 0.875 | 2.25 | 1 |
| 145T | 3.50 | 5.50 | 5.00 | 2.25 | 0.34 | 0.875 | 2.25 | 1.5–2 |
| 182T | 4.50 | 7.50 | 4.50 | 2.75 | 0.41 | 1.125 | 2.75 | 3 |
| 184T | 4.50 | 7.50 | 5.50 | 2.75 | 0.41 | 1.125 | 2.75 | 5 |
| 213T | 5.25 | 8.50 | 5.50 | 3.50 | 0.41 | 1.375 | 3.38 | 7.5 |
| 215T | 5.25 | 8.50 | 7.00 | 3.50 | 0.41 | 1.375 | 3.38 | 10 |
| 254T | 6.25 | 10.00 | 8.25 | 4.25 | 0.53 | 1.625 | 4.00 | 15 |
| 256T | 6.25 | 10.00 | 10.00 | 4.25 | 0.53 | 1.625 | 4.00 | 20 |
| 284T | 7.00 | 11.00 | 9.50 | 4.75 | 0.53 | 1.875 | 4.62 | 25 |
| 286T | 7.00 | 11.00 | 11.00 | 4.75 | 0.53 | 1.875 | 4.62 | 30 |
| 324T | 8.00 | 12.50 | 10.50 | 5.25 | 0.66 | 2.125 | 5.25 | 40 |
| 326T | 8.00 | 12.50 | 12.00 | 5.25 | 0.66 | 2.125 | 5.25 | 50 |
| 364T | 9.00 | 14.00 | 11.25 | 5.88 | 0.66 | 2.375 | 5.88 | 60 |
| 365T | 9.00 | 14.00 | 12.25 | 5.88 | 0.66 | 2.375 | 5.88 | 75 |
| 404T | 10.00 | 16.00 | 12.25 | 6.62 | 0.81 | 2.875 | 7.25 | 100 |
| 405T | 10.00 | 16.00 | 13.75 | 6.62 | 0.81 | 2.875 | 7.25 | 125 |
| 444T | 11.00 | 18.00 | 14.50 | 7.50 | 0.81 | 3.375 | 8.50 | 150 |
| 445T | 11.00 | 18.00 | 16.50 | 7.50 | 0.81 | 3.375 | 8.50 | 200 |
| 447T | 11.00 | 18.00 | 20.00 | 7.50 | 0.81 | 3.375 | 8.50 | 250 |
| 449T | 11.00 | 18.00 | 25.00 | 7.50 | 0.81 | 3.375 | 8.50 | 300 |
Frame suffixes
| Suffix | Means |
|---|---|
| T | Current standard (1964 on) dimensions |
| U | Older, pre-1964 rerate: bigger frame, same HP |
| TS | Short shaft, for belt-free direct coupling (2-pole) |
| C | C-face: tapped holes in the end shield |
| D | D-flange: through holes, larger flange |
| Y | Non-standard mounting — see the maker's drawing |
| Z | Non-standard shaft extension |
| J | Jet pump shaft, C-face |
| JM / JP | Close-coupled pump shaft, C-face |
The first two digits of a T frame ÷ 4 = the shaft height D in inches: a 184T has its shaft 4.5 in up. The third digit is the foot length — 182T and 184T share everything except 2F.
D = shaft height, 2E = foot holes across the shaft, 2F = along it, BA = shaft shoulder to the nearest foot holes, H = foot hole, U = shaft diameter, N-W = usable shaft length. HP is the usual rating for a 4-pole (1800 rpm) TEFC motor in that frame.