Toroid core dimensions by model — outer/inner diameter, height, volume and max power for the common FT and T sizes.
Toroid core dimensions by model — outer/inner diameter, height, volume and max power for the common FT and T sizes.

| Model | OD (in) | ID (in) | Ht (in) | Vol (in3) | Max Power (W) |
|---|---|---|---|---|---|
| FB-XX-101 | 0.138 | 0.051 | 0.128 | 0.002 | |
| FB-XX-2401 | 0.380 | 0.197 | 0.190 | 0.016 | |
| FB-XX-4852 | 0.485 | 0.200 | 1.000 | 0.153 | |
| FB-XX-7351 | 0.735 | 0.400 | 1.125 | 0.336 | |
| FB-XX-1020 | 1.020 | 0.505 | 1.125 | 0.694 | |
| FT23-XX | 0.230 | 0.120 | 0.060 | 0.002 | 1 |
| FT37-XX | 0.375 | 0.187 | 0.125 | 0.010 | 1 |
| FT50-XX | 0.500 | 0.281 | 0.188 | 0.025 | 5 |
| FT82-XX | 0.825 | 0.520 | 0.250 | 0.081 | 25 |
| FT114-XX | 1.140 | 0.478 | 0.295 | 0.248 | 50 |
| FT140-XX | 1.400 | 0.900 | 0.500 | 0.452 | 100 |
| FT240-XX | 2.400 | 1.400 | 0.500 | 1.492 | 500 |
| FT290-XX | 2.900 | 1.530 | 0.500 | 2.383 | 750 |
| T25-XX | 0.255 | 0.120 | 0.096 | 0.004 | 10 |
| T30-XX | 0.307 | 0.151 | 0.128 | 0.007 | 2 |
| T37-XX | 0.375 | 0.205 | 0.128 | 0.010 | 5 |
| T44-XX | 0.440 | 0.229 | 0.159 | 0.018 | 7 |
| T50-XX | 0.500 | 0.303 | 0.190 | 0.024 | 12 |
| T68-XX | 0.690 | 0.370 | 0.190 | 0.051 | 25 |
| T80-XX | 0.795 | 0.495 | 0.250 | 0.076 | 40 |
| T94-XX | 0.942 | 0.560 | 0.312 | 0.141 | 75 |
| T106-XX | 1.060 | 0.570 | 0.437 | 0.274 | 100 |
| T130-XX | 1.300 | 0.780 | 0.437 | 0.371 | 150 |
| T157-XX | 1.570 | 0.950 | 0.570 | 0.699 | 250 |
| T184-XX | 1.840 | 0.950 | 0.710 | 1.385 | 500 |
| T200-XX | 2.000 | 1.250 | 0.550 | 1.053 | 500 |
| T225-XX | 2.250 | 1.400 | 1.000 | 2.437 | 1000 |