IEC Frame Size | 07 Nov 2013 | |

IEC Frame Size

General
Usual IEC sizes
Mechanical tolerance
1. Recommended shaft basis fit
2. Recommended tolerance fields for key width

General

The IEC 72 defines motor frame size standards for regions that use SI units.

Regions using "inch" units work with NEMA standards (see page NEMA Frame Size). Therefore most motor series are offered with both standard frame sizes.

Usual IEC sizes

All dimensions in mm

Figure: Reference graphic for dimensions

IEC	Torque* in Nm	Flange (P)	Bolt Circle (M)	Mounting Holes (S)	Register Diameter (N)	Shaft Diameter (D)	Shaft Length (E)	Keyway width (F)	remaining shaft thickness to keyway (G)
63	1,22	140	115	9	95	11	23	4	8,5
71	2,8	160	130	10	110	14	30	5	11
80	8,25	200	165	12	130	19	40	6	15,5
90	18,5	200	165	12	130	24	50	8	20
100	31,5	250	215	14	180	28	60	8	24
112	31,5	250	215	14	180	28	60	8	24
132	92,5	300	265	14	230	38	80	10	33
160	132	350	300	19	250	42	110	12	37
180	212	350	300	19	250	48	110	14	42.5
200	345	400	350	19	300	55	110	16	49

* Rated torque with permanent operation according to IEC 72

Mechanical tolerance

ISO tolerance to DIN 748, DIN 7160, DIN 42948 .

Diameter shaft end (dimension „D“)	up to 28 mm	j 6
	38 to 50 mm	k 6
	more than 50 mm	m 6
Register Diameter (dimension „N”)	up to 230 mm	j 6
Register Diameter (dimension „N”)	more than 230 mm	h 6

Recommended shaft basis fit

Hub alignment	Hole basis fit	Shaft basis fit
on long shafts, fixed	H7/j6	J7/h6, h8, h9
on shaft end, fixed	H7/k6, m6	K7, M7/h6, N7/h8
on shaft, slidable	H7/h6, j6	H7, J7/h6, h8

Recommended tolerance fields for key width

Hub character	Key width		Fit character
Hub character	Shaft	Hub	Fit character
slideable	H9	D10	Sliding fit
easily mountable	N9	JS9	Transition fit
for bi-directional torque	P9	P9	Tight fit