IEC 112M Frame Motors and Dimensions

DRG Motor offers three standard ratings and one compact model in the IEC 112M frame: 4 kW in 2 and 4 poles, 2.2 kW in 6 poles, and 5.5 kW in 4 poles with the compact DRG-112M-4K-AL. All share a 112 mm shaft height, a 28×60 mm shaft, 190×140 mm foot holes and a 250 mm B5 flange; the standard 4-pole 5.5 kW motor is not a 112M but a 132S.

Grey DRG three-phase asynchronous electric motor of the IEC 112M frame size

You can filter all seven products of this frame by power and speed in the online shop, and see the aluminium and cast iron versions side by side in the three-phase asynchronous electric motors category. Below we go through the models, the catalogue dimensions and the two points that most often cause confusion with 112M: the compact 5.5 kW and the voltage change at 4 kW.

Which DRG models use the 112M frame?

112M is the standard frame for 4 kW. The same power fits this frame in 2 poles (3000 rpm class) and 4 poles (1500 rpm class); in 6 poles (1000 rpm class) the frame carries 2.2 kW. Every standard model is listed with both an aluminium and a cast iron housing; the compact 5.5 kW is aluminium only. The table shows the speed class next to the rated speed: “1500 rpm” is a class, the nameplate value is the actual speed at rated load.

Model	Power / poles	Speed class → rated speed	Housing
DRG-112M-2-AL	4 kW (5.5 HP) / 2 poles	3000 → 2905 rpm	aluminium
DRG-112M-2-GG	4 kW (5.5 HP) / 2 poles	3000 → 2905 rpm	cast iron
DRG-112M-4-AL	4 kW (5.5 HP) / 4 poles	1500 → 1450 rpm	aluminium
DRG-112M-4-GG	4 kW (5.5 HP) / 4 poles	1500 → 1450 rpm	cast iron
DRG-112M-4K-AL	5.5 kW (7.5 HP) / 4 poles (compact)	1500 → 1460 rpm	aluminium
DRG-112M-6-AL	2.2 kW (3 HP) / 6 poles	1000 → 955 rpm	aluminium
DRG-112M-6-GG	2.2 kW (3 HP) / 6 poles	1000 → 955 rpm	cast iron

Choosing aluminium or cast iron does not change the dimensions; in the data both housings have identical B3 dimensions, current and torque. The choice depends on environment and duty; see the aluminium vs cast iron housing comparison.

Nameplate values: voltage, current and torque

Sharing a frame does not make the motors electrically interchangeable. The 2-pole and 4-pole 4 kW motors carry the same shaft, yet the 4-pole one delivers almost twice the torque, so the coupling, pulley or gearbox input must be checked against it. Torque follows T = 9550 × P / n using the rated speed; for 4 poles, 4 kW: 9550 × 4 / 1450 ≈ 26.3 Nm.

Type	Voltage (Δ/Y)	Current at 400 V	Rated torque
DRG-112M-2-AL	400/690 V	7.45 A	13.1 Nm
DRG-112M-4-AL	400/690 V	7.95 A	26.3 Nm
DRG-112M-4K-AL	400/690 V	10.7 A	36 Nm
DRG-112M-6-AL	230/400 V	5.09 A	22 Nm

The cast iron versions (DRG-112M-2-GG, DRG-112M-4-GG, DRG-112M-6-GG) have the same current and torque. For protection and cable sizing use the motor current chart and the motor cable size calculator.

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112M B3 foot and shaft dimensions

In the DRG catalogue all 112M models, including the compact one, share the same B3 dimension line. Shaft diameter is 28 mm, shaft length 60 mm and key width 8 mm. Foot holes are 4–Φ12 mm; bearing 6206-ZZ-C3, cable entry 2 × M32×1,5.

Dimension	Meaning	Value (mm)
H	Shaft centre height	112
A	Foot hole spacing (across)	190
B	Foot hole spacing (lengthwise)	140
C	Shaft shoulder to first foot hole	70
K	Foot holes (qty – diameter)	4–Φ12
D	Shaft diameter	28
E	Shaft length	60
F	Key width	8
AC	Housing diameter	230
AD	Shaft axis to terminal box top	188
L	Overall length	394

When replacing an old 112M motor, compare H, A, B and C first: base holes and coupling alignment depend on them. The dimensions are shown on the 2D technical drawings, and every frame is listed in the DRG Motor catalogue.

112M B5 flange dimensions

For flange mounting, the catalogue B5 (large flange) line applies. Outer diameter P, spigot diameter N, bolt circle M and hole diameter S are separate dimensions; matching a flange by its outer diameter alone leads to mistakes.

Dimension	Meaning	Value (mm)
P	Flange outer diameter	250
M	Bolt circle diameter	215
N	Spigot (pilot) diameter	180
S	Flange hole diameter	14.5
T	Spigot depth	4
LA	Flange thickness	14
G	Key bottom dimension	24
DH	Shaft end tapped hole	M10×22
L	Overall length (B5)	394

For this frame the B5 flange is P 250 mm, M 215 mm, N 180 mm, S 14.5 mm. For a side-by-side view of all frames see the B5 motor flange dimensions table. The B14 (small flange) table is not part of the catalogue, so no B14 dimensions are given here. If you need B14 or a foot-and-small-flange (B34) version, send us the flange outer diameter, bolt circle, spigot diameter and thread on WhatsApp and we will confirm. More detail is in the B34 ordering dimensions article.

Compact DRG-112M-4K-AL: why 5.5 kW in a 112M?

In the standard range, 4-pole 5.5 kW belongs to the 132S frame (DRG-132S-4-AL and DRG-132S-4-GG). DRG-112M-4K-AL offers the same power one frame size down, with 112M dimensions; the “K” in the code marks the compact design. Both motors have the same nameplate ratings but different mechanical interfaces:

Item	DRG-112M-4K-AL (compact)	DRG-132S-4-AL (standard)
Power / rated speed	5.5 kW / 1460 rpm	5.5 kW / 1460 rpm
Shaft height H	112 mm	132 mm
Shaft D×E / key F	28×60 / 8 mm	38×80 / 10 mm
Feet A×B / C	190×140 / 70 mm	216×140 / 89 mm
B5 flange P / M / N	250 / 215 / 180 mm	300 / 265 / 230 mm
Overall length L	394 mm	438 mm
Bearing	6206-ZZ-C3	6208-ZZ-C3
Current at 400 V / torque	10.7 A / 36 Nm	10.7 A / 36 Nm

In practice: if your machine has a 112M interface (28 mm shaft, 250 mm flange or 190×140 feet) and 4 kW is not enough, the compact model allows more power without changing the mechanics; however, current rises from 7.95 A to 10.7 A and torque from 26.3 Nm to 36 Nm. Cable, overload setting and the coupling or gearbox input must be checked for this torque. For a new design, or when the mating part expects a 38 mm shaft, 132S is the right choice. Flanged 5.5 kW options are covered in the 5.5 kW flange motor article.

The switch to 400/690 V at 4 kW and terminal connection

The 112M frame hosts two different nameplate voltages. The 6-pole 2.2 kW models are rated 230/400 V (Δ/Y); the 4 kW and compact 5.5 kW models are 400/690 V (Δ/Y). In the DRG range, motors up to 3 kW are 230/400 V and from 4 kW upward 400/690 V. On a 400 V three-phase supply this means:

A 230/400 V motor (6 poles, 2.2 kW) is connected in star (Y) on 400 V.
A 400/690 V motor (4 kW and 5.5 kW) is connected in delta (Δ) on 400 V; these motors can also be used with star-delta starting on a 400 V supply.
If your old 4 kW motor was rated 230/400 V, do not copy the old link arrangement; set the terminal links according to the new nameplate.

For flanged 4 kW applications see 4 kW flange motor: flange and shaft dimensions in 112M and 132M; we do not repeat that here.

Dimensions to confirm before ordering

Power and poles: 4 kW exists at two speeds in this frame; 5.5 kW only as the compact 4-pole.
Shaft: 28×60 mm, key 8 mm; does the mating bore and keyway match?
Mounting: B3 feet or B5 flange? On B5, measure P / M / N / S together.
For a gearbox: read the input bore, key, input flange/adapter and permitted input torque from the gearbox nameplate; the frame code alone does not prove fit. See choosing a flange motor for a gearbox.
Voltage: on a 400 V supply, 4 kW and above in delta, 6-pole 2.2 kW in star.

The ordering sequence by shaft and frame is in the motor frame size order guide, and shaft diameters by power in the motor shaft diameter by kW table. Send a photo of your motor nameplate and the shaft/flange dimensions, and we will check together which 112M model corresponds.

Send a photo of your current motor nameplate and we will find the suitable DRG model together.Send on WhatsApp

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Frequently asked questions

Is there a 5.5 kW motor in the 112M frame?

Yes, but only as a compact model: DRG-112M-4K-AL, 4 poles, aluminium housing. The standard 5.5 kW 4-pole motor is a 132S with a 38×80 mm shaft.

Do the 2-pole and 4-pole 112M motors have the same shaft?

Yes. In the catalogue data all 2, 4 and 6-pole 112M models use a 28×60 mm shaft and a 8 mm key. The difference is torque: 13.1 Nm in 2 poles, 26.3 Nm in 4 poles.

Are the mounting dimensions of the compact 5.5 kW and the 4 kW the same?

In the catalogue B3 line, H, A, B, C, D, E and L are identical. Current and torque differ, so even if the mechanics fit, cable, protection and coupling must be checked.

Why is the 6-pole 112M rated 2.2 kW?

The more poles, the less power the same frame delivers. In 112M the 6-pole motor gives 2.2 kW at 955 rpm and 22 Nm, and unlike the 4 kW its nameplate voltage is 230/400 V (Δ/Y).

Electric Motors Related to This Topic — Models and Current Prices

Suitability is not decided by power alone: compare the speed, voltage, mounting, shaft and fixing dimensions of your machine with the product data; if unsure, send us the nameplate of your current motor.