IEC 63 and 71 Frame Electric Motors

DRG Motor offers a single model in IEC frame 63: DRG-632-2, a 0.25 kW, 3000 rpm class motor with an aluminium housing, a 11×23 mm shaft and a 63 mm shaft height. Frame 71 has 6 entries from 0.25 to 0.55 kW; all share the 14×30 mm shaft, the 71 mm shaft height and the same foot dimensions, and only DRG-712-2 is also available in cast iron. For B5 flange mounting the outer diameter P is 140 mm on frame 63 and 160 mm on frame 71.

Grey DRG three-phase asynchronous electric motor – example of a small IEC motor such as frames 63 and 71

All models of these two frames are listed with product cards in the DRG Motor online shop; the wider product group is on the three-phase asynchronous electric motors page, and the lightweight options are grouped under aluminium housing electric motors. Below we go through the models, dimensions and the details to check before ordering.

Which DRG models are built on frames 63 and 71?

There are seven product codes but six electrical types: DRG-712-2 is sold with both an aluminium (AL) and a cast iron (GG) housing. In the code, the first digits give the frame (63, 71), the following 1 or 2 marks the length/power step within that frame, and the number after the dash is the pole count.

Model	Frame / housing	Power / speed class	Rated speed
DRG-632-2-AL	63 / aluminium	0.25 kW (0.37 HP) / 3000 rpm (2 poles)	2730 rpm
DRG-711-4-AL	71 / aluminium	0.25 kW (0.37 HP) / 1500 rpm (4 poles)	1340 rpm
DRG-712-6-AL	71 / aluminium	0.25 kW (0.37 HP) / 1000 rpm (6 poles)	855 rpm
DRG-711-2-AL	71 / aluminium	0.37 kW (0.5 HP) / 3000 rpm (2 poles)	2750 rpm
DRG-712-4-AL	71 / aluminium	0.37 kW (0.5 HP) / 1500 rpm (4 poles)	1340 rpm
DRG-712-2-AL	71 / aluminium	0.55 kW (0.75 HP) / 3000 rpm (2 poles)	2750 rpm
DRG-712-2-GG	71 / cast iron	0.55 kW (0.75 HP) / 3000 rpm (2 poles)	2750 rpm

The first takeaway: a 0.25 kW motor appears in three places. The 2-pole (3000 rpm class) version is frame 63, while the 4-pole and 6-pole 0.25 kW motors are frame 71. "0.25 kW" alone does not define the frame; the speed has to be given too.

Speed class, rated speed and torque

"3000 rpm", "1500 rpm" and "1000 rpm" are synchronous speed classes. The real rated speed under load is printed on the nameplate and is lower: 2730 rpm for DRG-632-2, 855 rpm for DRG-712-6. Shaft torque is calculated with that rated speed:

T (Nm) = 9550 × P (kW) / n (rpm) → DRG-712-6: 9550 × 0.25 / 855 ≈ 2.79 Nm.

At the same 0.25 kW, torque rises as speed falls: DRG-632-2 0.87 Nm, DRG-711-4 1.78 Nm, DRG-712-6 2.79 Nm. For a small mixer or a slow drive, the 6-pole frame 71 gives roughly three times the torque of the frame 63 motor with the same power. Current and torque values:

Model	Current (400 V)	Torque	Bearing
DRG-632-2-AL	0.64 A	0.87 Nm	6201-ZZ-C3
DRG-711-4-AL	0.66 A	1.78 Nm	6202-ZZ-C3
DRG-712-6-AL	0.77 A	2.79 Nm	6202-ZZ-C3
DRG-711-2-AL	0.89 A	1.28 Nm	6202-ZZ-C3
DRG-712-4-AL	0.92 A	2.64 Nm	6202-ZZ-C3
DRG-712-2-AL	1.24 A	1.91 Nm	6202-ZZ-C3
DRG-712-2-GG	1.24 A	1.91 Nm	6202-ZZ-C3

When setting the overload relay, use the nameplate value; typical currents for other ratings are in the motor current chart, and cable size can be checked with the motor cable size calculator.

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Foot (B3) mounting and shaft dimensions: 63 versus 71

The two frames look close, yet none of their mounting dimensions match. The shaft grows from 11 to 14 mm, its length from 23 to 30 mm, the key from 4 to 5 mm, and the foot hole spacing from 100 × 80 to 112 × 90 mm. All six frame 71 entries share the same B3 dimensions, so changing power or poles within frame 71 does not change the base.

Dimension	Meaning	Frame 63 (mm)	Frame 71 (mm)
H	Shaft centre height	63	71
A	Foot hole spacing (across)	100	112
B	Foot hole spacing (along)	80	90
C	Shaft shoulder to front foot hole	40	45
K	Foot holes	4–Φ7	4–Φ7
D×E	Shaft diameter × length	11 × 23	14 × 30
F	Key width	4	5
AC	Housing diameter	120	136
AD	Axis to top of terminal box	113	119
L	Overall length	217	242

Bearings differ as well: 6201-ZZ-C3 on frame 63, 6202-ZZ-C3 on frame 71. Both frames have a 1 × M20×1.5 cable entry. All dimension letters are shown in the DRG Motor 2D technical drawings.

B5 flange rows: P, N, M and S one by one

On a B5 (large) flange four values are checked together: outer diameter P, spigot diameter N, bolt circle M and hole diameter S. Spigot depth T and flange thickness LA should also be compared with the recess depth on the machine. The DRG catalogue has one row per frame for 2, 4 and 6 poles:

Dimension	Meaning	63 B5 (mm)	71 B5 (mm)
P	Flange outer diameter	140	160
M	Bolt circle diameter	115	130
N	Spigot (pilot) diameter	95	110
S	Flange hole diameter	10	10
T	Spigot depth	3	3.5
LA	Flange thickness	10	10
D×E	Shaft diameter × length	11 × 23	14 × 30
F	Key width	4	5
G	Keyway bottom dimension	8.5	11
DH	Shaft end thread	M4×12	M5×12
L	Overall length	217	242
KK	Cable entry	1–M20×1.5	1–M20×1.5

Note that S (10 mm) and LA (10 mm) are identical on both frames, so the hole size alone does not tell them apart; the real difference is in P (140 → 160 mm), M (115 → 130 mm) and N (95 → 110 mm). For other frames see the B5 motor flange dimensions table.

Aluminium or cast iron?

Frame 63 has no cast iron option; DRG-632-2 is aluminium only. On frame 71 the 0.25 and 0.37 kW models are also listed in aluminium only. Housing material becomes a choice only at 0.55 kW 2-pole: DRG-712-2-AL and DRG-712-2-GG have the same power, rated speed (2750 rpm), 400 V current (1.24 A) and B3 dimensions. The difference is the housing: aluminium is lighter, cast iron is preferred where shocks and vibration are heavy. A general comparison is in aluminium housing vs cast iron housing.

230/400 V connection: why it matters on small frames

All seven entries are wound for 230/400 V (Δ/Y). On a 400 V line-to-line supply they are connected in star (Y); on a 230 V line-to-line supply (for example a frequency inverter with that output) in delta (Δ). These are three-phase motors and are not connected directly to a single-phase socket. The most common mistake on small machines is leaving the terminal links as they were in a previous installation: a frame 71 motor left in delta on a 400 V network quickly draws overcurrent. Compare the nameplate voltage with the link position before start-up.

Use on small machines and differences that lead to wrong selection

Frames 63 and 71 are used where little power is needed: small fans, light conveyor drives, dosing and mixing units, auxiliary motions on packaging machines. At this scale selection errors usually come from the mechanical interface rather than power:

Looking for 0.37 kW 6-pole: this combination does not exist on frame 71; in the DRG range it is DRG-801-6 on frame 80, with a 19×40 mm shaft.
Looking for 0.55 kW 4-pole: on frame 71, 0.55 kW is 2-pole only; the 4-pole equivalent is DRG-801-4 on frame 80. Shaft and flange change, so coupling and mounting must be rechecked.
Old motor is 0.25 kW 4-pole: the replacement is DRG-711-4, not frame 63; frame 63 has no 4-pole model.
Mixing up the 11 and 14 mm shafts: a 3 mm difference is hard to see; measure with a caliper before ordering a coupling.

Confirmation for B14 or gearbox connections

The DRG catalogue has no B14 small-flange table for frames 63 and 71, so we give no B14 dimensions here and do not claim that B14/B34 exists on every frame. If you need B14 or B34, send the outer diameter, bolt circle, spigot diameter and thread of your existing flange via WhatsApp and we will confirm it together. General information on B14 is in B14 flange electric motors.

If the motor is to drive a worm or other gearbox, the gearbox size code alone is not enough: the gearbox maker, ratio, input adapter/flange, input bore, key and permitted load must be verified. Compare what you read on the gearbox nameplate and input with the DRG data like this:

Check	Where to read it on the machine / gearbox side	63 DRG	71 DRG
Shaft diameter × length	Bore diameter and depth of the coupling or input	11 × 23 mm	14 × 30 mm
Key width	Keyway in the bore	4 mm	5 mm
B5 flange P / M / N	Input flange outer diameter, bolt circle, spigot recess	140 / 115 / 95 mm	160 / 130 / 110 mm
Foot (B3) mounting	Base hole spacing A × B and shaft height H	100 × 80, H 63 mm	112 × 90, H 71 mm

The selection logic is explained in flange motor for gearbox: B5 and B14 selection, and suitable motor groups on the worm gearbox electric motor page. DRG Motor is a manufacturer, supplier and seller of electric motors; it does not sell gearboxes, only the motor.

Checklist before ordering

Power (kW) together with speed class: 0.25 kW 2-pole is frame 63, 4/6-pole is frame 71.
Shaft diameter and length: 11×23 mm (63) or 14×30 mm (71), key 4 / 5 mm.
Mounting: B3 foot spacing (A × B), or B5 flange P, M, N and S separately.
Housing: cast iron only for 0.55 kW 2-pole on frame 71.
Supply: 230/400 V (Δ/Y) and terminal link position.

Send a nameplate photo and the shaft/flange values you measured with a caliper, and we will pin down the right DRG model with you.

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 4-pole DRG motor on frame 63?

No. The only DRG model on frame 63 is DRG-632-2 (0.25 kW, 2-pole). For 0.25 kW 4-pole there is DRG-711-4, for 6-pole DRG-712-6.

Do shaft and foot dimensions change with power on frame 71?

Not in the DRG data: every frame 71 entry has a 14×30 mm shaft, 112 × 90 mm foot spacing and 242 mm overall length. What changes is power, speed, current and torque.

Can a frame 71 motor replace a frame 63 motor?

Electrically it may be possible, but the mechanics change: shaft 11 → 14 mm, shaft height 63 → 71 mm, B5 flange outer diameter 140 → 160 mm. The coupling, base holes or adapter must be reworked.

Where do I get the B14 flange dimensions for frame 71?

Since the DRG catalogue has no B14 table, we take the dimensions from you and confirm them. Sending P, M, N and the thread of your existing flange is enough. Shaft sizes across ratings are compared in the motor shaft diameter by kW table, mounting types in B3, B5, B14 and B35 compared, and all dimensions in the DRG Motor technical and product catalogue 2026.

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.