SUFFIXES TO NEMA FRAMES AND WHAT THEY MEAN
Note: “D” dimension (shaft height) of a motor or generator in these frame sizes equals Ό the value of the first two digits in the frame number.  

K  -

 sump pump motors. (See NEMA MG1-1998, 18.78.)
  For Example: 284 frame is 28/4 = 7, “D” = 7”  

LP or LPH-

 Type P flange-mounted, vertical solid-shaft motors having dimensions in accordance with MG 1-1998, 18.251.             (The letters “LP” and “LPH” are considered as one suffix and should not be separated.)

A  –

Industrial direct-current machine.   M  -
 		 Oil burner motors. (See NEMA MG1-1998, 18.106.)

B  –

Carbonator pump motors. (See NEMA MG1-1998, 18.270 – 18.281.)   N  - Oil burner motors. (See NEMA MG1-1998, 18.106)

 C -  

 

 Type C face mounting on drive end.   P or PH - Type P flange-mounted, vertical hollow-shaft motors having dimensions in accordance with NEMA MG 1-1998,         18.238.
CH –       Face mounting dimensions are different from those for the frame designator having the suffix letter “C”. (the letters “CH” are considered as one suffix and should not be separated.)   R  - Drive end tapered shaft extension having dimensions in accordance with NEMA MG1-1998, 4.4.2.

D  -

 Type D flange mounting on drive end.   S  - Standard short shaft for direct connection.
 E - Shaft extension dimensions for elevator motors in frames larger than 326T frames.   T  - Included as part of a frame designation for which standard dimensions have been established.
FC -  Face mounting on opposite drive end.   U  - Previously used as part of a frame designation for which standard dimensions had been established.
 G - Gasoline pump motors. (See NEMA MG1 – 1009. 18.91.)   V  - Vertical mounting only.
 H - Indicates a small machine having an “F” dimension larger than that of the same frame without the suffix letter “H”. (See NEMA MG1 – 1998, 4.4.1 and 4.5.1.)   VP  - Type P flange-mounted, vertical solid-shaft motors having dimensions in accordance with NEMA MG 1-1998, 18.237. (The letters “VP” are considered as one suffix and should not be separated.
HP or HPH - Type P flange-mounted, vertical solid-shaft motors having dimensions in accordance with NEMA MG 1-1009, 18.252. (The letter “HP” and “HPH” are considered as one suffix and should not be separated.)   X  - Wound-rotor crane motors with double shaft extension. (See NEMA MG 1-1998, 18.229 and 18.230)
J  - Jet pump motors. (See NEMA MG1-1009, 18.132.)    Y  - Special mounting dimensions. (Contact the manufacture for dimensions.)
JM  - Face-mounted, close-coupled pump motor having antifriction bearings and dimensions in accordance with Table 1 of MG1-1998, 18.250. (The letters “JM” are considered as one suffix and should not be separated.)   Z  - All mounting dimensions are standard except the shaft extension(s). It is also used to designate double shaft  extension(s).
JP  - Type C face-mounted, close-couple pump motor having antifriction bearings and dimensions in accordance with Table 2 of MG1-1998, 18.250. (The letters “JP” are considered as one suffix and should not be separated.)   Note: Manufactures may use any letter preceding the frame number, but will have no reference to standard mounting dimensions.