The Gates Rubber Company Denver, Colorado USA …

1 gatesfacts Technical Information Library Gates Compass Power Transmission CD-ROM version The Gates Rubber Company Denver, Colorado USA _____ Page 1 NEMA Motor Shaft Diameters PA NOTE NEMA has developed standards over the years for shaft diameters based on motor frame sizes. When doing a Design Flexibility Analysis, use these shaft diameters to help exclude unacceptable drive combinations. Refer to Table 1 for Open Motors or Table 2 for Totally Enclosed Fan Cooled Motors (TEFC) to find a frame size based on motor HP. Use Table 3 to find the shaft diameter for that motor. These shaft diameters are based on the 1964 NEMA Reratings. Use Tables 4-6 for 1953 NEMA Reratings (U Frames). Also included is the shaft length and keyseat width. Note that NEMA has determined the maximum pull a motor can handle satisfactorily to prevent premature motor bearing failure. This pull is translated back to a minimum allowable sheave, pulley or sprocket diameter.

2 These NEMA minimum allowable diameter are referenced in the various Gates design catalogs. 1964 NEMA RERATING (T FRAMES) HP 900 rpm 1200 rpm 1800 rpm 3600 rpm HP 900 rpm 1200 rpm 1800 rpm 3600 rpm 1 2 182T 184T 213T 145T 182T 184T 143T 145T 145T 143T 145T 1 2 182T 184T 213T 145T 182T 184T 143T 145T 145T 143T 145T 3 5 215T 254T 256T 213T 215T 254T 182T 184T 213T 145T 182T 184T 3 5 215T 254T 256T 213T 215T 254T 182T 184T 213T 182T 184T 213T 10 15 20 284T 286T 324T 256T 284T 286T 215T 254T 256T 213T 215T 254T 10 15 20 284T 286T 324T 256T 284T 286T 215T 254T 256T 215T 254T 256T 25 30 40 326T 264T 265T 324T 326T 364T 284T 286T 324T 256T 284TS 286TS 25 30 40 326T 264T 265T 324T 326T 364T 284T 286T 324T 284TS 286TS 324TS 50 60 75 404T 405T 444T 365T 404T 405T 326T 364TS 365TS 324TS 326TS 364TS 50 60 75 404T 405T 444T 365T 404T 405T 326T 364TS 365TS 326TS 364TS 365TS 100 125 150 445T 444T 445T 404TS 405TS 444TS 365TS 404TS 405TS 100 125 150 445T 444T 445T 405TS 444TS 445TS 405TS 444TS 445TS 200 250 445TS 444TS 445TS

3 Motor Shaft Shaft Keyseat Motor Shaft Shaft KeyseaThree Phase Frame Sizes Open Motors - General Purpose Three Phase Frame Sizes TEFC - General Purpose TABLE 1 TABLE 2 gatesfacts Technical Information Library Gates Compass Power Transmission CD-ROM version The Gates Rubber Company Denver, Colorado USA _____ Page 2 Frame Diameter Length Width Frame Diameter Length t Width 143T 145T 182T 184T .875 .875 .188 .188 .250 .250 326T 326TS 364T 364TS .500 .500 .625 .500 213T 215T 254T 256T .312 .312 .375 .375 365T 365TS 404T 404TS .625 .500 .750 .500 284T 284TS 286T 286TS .500 .375 .500 .375 405T 405TS 444T 444TS .750 .500 .875 .625 324T 324TS .500 .500 445T 445TS .875 .625 1952 NEMA RERATING (U FRAMES) HP 900 rpm 1200 rpm 1800 rpm 3600 rpm HP 900 rpm 1200 rpm 1800 rpm 3600 rpm 1 2 213 213 215 184 184 213 182 184 184 182 184 1 2 213 213 215 184 184 213 182 184 184 182 184 3 5 254U 256U 284U 215 254U 256U 213 215 254U 184 213 215 3 5 254U 256U 284U 215 254U 256U 213 215 254U 184 213 215 10 15 20 286U 326U 364U 284U 324U 326U 256U 284U 286U 254U 256U 284U 10 15 20 286U 326U 364U 284U 324U 326U 256U 284U 286U 254U 256U 286U 25 30 40 365U 404U 405U 364U 365U 404U 324U 326U 364U 286U 324S 326S 25 30 40 365U 404U 405U 364U 365U 404U 324U 326U 364U 324U 326S 364US 50 60 75 444U 445U 405U 444U 445U 365US 404US 405US 364US 365US 407US 50 60 75 444U 445U 405U 444U 445U 365US 405US 444US 365US 405US 444US 100 125 150 444US 445US 405US 444US 445US 100 445US 445US Motor Frame Shaft Diameter Shaft Length Keyseat Width Motor Frame Shaft Diameter Shaft Length Keyseat Three Phase Frame Sizes Open Motors.

4 General Purpose Three Phase Frame Sizes TEFC - General Purpose TABLE 4 TABLE 5 TABLE 3 gatesfacts Technical Information Library Gates Compass Power Transmission CD-ROM version The Gates Rubber Company Denver, Colorado USA _____ Page 3 Width 182 184 213 215 .188 .188 .250 .250 364U 364US 365U 365US .500 .500 .500 .500 254U 256U 284U 286U .312 .312 .375 .375 404U 404US 405U 405US .625 .500 .625 .500 324S 324U 326S 326U .375 .500 .375 .500 444U 444US 445U 445US .750 .500 .750 .500 TABLE 6