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The dimension table is read by IEC frame number and number of poles, not by power. First you find the row (e.g. 132M, 4 poles); the letters in the columns then give the motor's foot holes, shaft height, shaft end and overall length in millimetres.
What the letters stand for
| Letter | Meaning | Used for |
|---|---|---|
| H | Height of the shaft axis above the underside of the feet | Axis alignment in a coupled drive |
| A / B | Transverse / longitudinal distance between foot holes | Hole pattern of the baseframe |
| C | Distance from the shaft shoulder to the nearest foot hole | Position of the pulley or coupling |
| K | Foot hole diameter | Bolt selection |
| D × E | Shaft diameter × shaft end length | Hub bore and pulley seating length |
| F / GA | Key width / height over shaft and key | Machining of the keyway |
| L | Overall length including the fan cover | Layout on the machine |
| M / N / P | Flange pitch circle / spigot / outside diameter | Flange mounting |
Same frame, different shaft
When reading the table row by row, do not skip the pole column. In DRG records, the 280S frame carries a 65×140 mm shaft in its 2-pole version and a 75×140 mm shaft in its 4-pole version; in the 315S frame the difference is between 65×140 and 85×170. So even with the same frame number, the faster motor may have a thinner shaft and an existing pulley hub will not fit.
Two points to check before the table
- Mounting type: Foot-mounted and flange-mounted rows may be in separate tables; the flange sizes for B5 are not the same as those for B14.
- Overall length: The L value can vary with frame material and power; on the machine, also leave an air gap behind the fan cowl so the motor can breathe.
For fine details such as tolerances or key size, the dimensioned drawing of the model is a safer reference than the table; the DRG technical drawing and catalogue page provides 2D drawings and STEP models. You can compare the frame you have sized on product pages such as the one for the aluminium 132M model rated 7.5 kW or in the full list of motor models.