The following are dimensional size charts for standard electric motor NEMA standard frames and configuration. Standardized motor dimensions are established by the National Electrical Manufacturers Association (NEMA) - are tabulated below and apply to all base-mounted motors listed herein that carry a NEMA frame designation

Drawings represent standard TEFC general purpose motors Refer Data Section 502 for various models, OPEN or TEFC *D im e ns oa rf c ly. Leader in Energy Efficient Industrial Electric Motors and Drives NEMAKeyseat NEMAKeyseat Shaft DimensionsShaft Dimensions (U)(R) (S)(U) (R)(S) 3/8 21/64 FLAT 1-7/8 1-19/32 1/2 1/2 29/64 FLAT 2-1/8 1-27/32 1/2

The above chart provides typical Baldor•Reliance motor dimensions. For more exact dimensional data, please check the specific drawing for each catalog number. Dimensional data for 444T through 449TS frame sizes reflect the use of a top mounted conduit box with a cantilevered mounting arm.

Shaft Diameter and Length: Provides critical data for coupling the motor with mechanical components. Key Specifications: Ensures proper alignment and torque transmission. How to Use the Chart. Locate your current motor’s frame size on its nameplate. Match the frame size with the corresponding row on the chart.

These dimensions are specific to each manufacturer. Suffix letters after the NEMA frame size indicates that the frame differs in some way from the standard frame. Below is a list of suffixes that may be found after the frame size: J JM JP. Note: These charts are provided for reference use only.