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ELECTRIC MOTORS 207
TABLE 12-3. IEC Versus NEMA Mounting Dimensions
For foot-mounted motors, the IEC frame designation consists of the shaft height followed by the shaft extension expressed
in millimeters, while the NEMA system uses a specific number for each frame.
Frame Size H/D A/2E B/2F C/BA K/H
IEC/NEMA IEC/NEMA IEC/NEMA IEC/NEMA IEC/NEMA IEC/NEMA
90S/143 90/86.9 140/139.7 100/101.6 56/57.2 10/8.6
90L/145 90/88.9 140/139.7 125/127 56/57.2 10/8.6
112S/180 H2/H4.3 190/190.5 114/114.3 70/69.9 12/10.4
112M/184 112/114. 3 190/190.5 140/139.7 89/88.9 12/10.4
132S/213 132/133.4 216/215.9 140/139.7 89/88.9 12/10.4
132M/216 132/133.4 216/215.9 178/177.8 89/88.9 12/10.4
160M/254 160/158.8 254/254 210/209.5 108/108 15/13.5
160L/256 160/158.8 254/254 254/254 108/108 15/13.5
180M/284 180/177.8 279/279.4 241/241.3 121/120.6 15/13.5
180L/286 180/177.8 279/279.4 279/279.4 121/120.6 15/13.5
200M/324 200/203.2 318/317.5 267/266.7 133/133.4 19/16.8
200L/326 200/203.2 318/317.5 305/304.8 133/133.4 19/16.8
225S/364 225/228.6 356/355.6 286/285.8 149/149.4 19/16.8
225M/365 225/228.6 356/355.6 311/311.1 149/149.4 19/16.8
250S/404 250/254 406/406.4 311/311.2 168/168.1 24/20.6
250M/405 250/254 406/406.4 349/349.2 168/168.1 24/20.6
280S/444 280/279.4 457/457.2 368/368.3 190/190.5 24/20.6
280M/445 280/279.4 457/457.2 419/419.1 190/190.5 24/20.6
315S/504 315/317.5 508/508 406/406.4 216/215.9 28/—
315M/505 315/317.5 508/508 457/457.2 216/215.9 28/—
355S/585 355/368.3 610/584.2 500/508 254/254 28/—
355M/586 355/368.3 610/584.2 560/558.8 254/254 28/—
400S/684 400/431.8 686/685.8 560/558.8 280/292.1 35/—
400M/685 400/431.8 686/685.8 630/635 280/292.1 35/—
Note: All dimensions are in millimeters.
TABLE 12-4. IEC Versus NEMA Mounting Dimensions Nomenclature
IEC NEMA
Letter Letter Dimension
H D Distance from shaft centerline to foot bottom
A 2E Distance between centerlines of foot mounting holes (end view)
B 2F Distance between centerlines of foot mounting holes (side view)
C BA Distance from shoulder on shaft to centerline of mounting holes in the nearest feet
K H Diameter of holes or width of slots in the feet
D U Diameter of shaft extension
M AJ Pitch circle diameter of fixing holes in face, flange, or base
N AK Diameter of spigot on face, flange, or base
S BF Diameter of threaded or clearance hole in face, flange, or base
