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Motors
NEMA Guidelines
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MOTORS
NEMA Letter Designations Following Frame Number C: Face-mount; see this page. H: Designated 56H motors have 2 sets of 2F mounting holes—3" and 5". J: Face-mount for jet pumps; see this page for dimensions.
K: Has hub for sump pump mounting; see column at left for dimensions. M, N: Flange mount for oil burner. T, U: Integral HP motor dimension standards set by NEMA in 1964 and 1953.
V: Vertical mount. Y: Nonstandard mounting; see manufacturer’s drawing for mounting dimensions. Z: Nonstandard shaft (N-W+U dimensions); see manufacturer’s drawing for shaft dimensions.
Motor Dimensional Chart Standardized motor dimensions—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.
NEMA Frame
All Dimensions in Inches V§ Key D* 2E 2F BA H N-W U Min. Wide Thick Long 42 2 5⁄8 3 1⁄2 1 11⁄16 2 1⁄16 9⁄32 slot 1 1⁄8 3⁄8 — — 3⁄64 flat — 48 3 4 1⁄4 2 3⁄4 2 1⁄2 11⁄32 slot 1 1⁄2 1⁄2 — — 3⁄64 flat — 48H 3 4 1⁄4 4 3⁄4 2 1⁄2 11⁄32 slot 1 1⁄2 1⁄2 — — 3⁄64 flat — 56 3 1⁄2 4 7⁄8 3 2 3⁄4 11⁄32 slot 1 7⁄8 † 5⁄8 † — 3⁄16 † 3⁄16 † 1 3⁄8 ‡ 56H 3 1⁄2 4 7⁄8 3 & 5‡ 2 3⁄4 11⁄32 slot 1 7⁄8 † 5⁄8 † — 3⁄16 † 3⁄16 † 1 3⁄8 † 56HZ 3 1⁄2 ** ** ** ** 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 66 4 1⁄8 5 7⁄8 5 3 1⁄8 13⁄32 slot 2 1⁄4 3⁄4 — 3⁄16 3⁄16 1 7⁄8 143T 3 1⁄2 5 1⁄2 4 2 1⁄4 11⁄32 dia. 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 145T 3 1⁄2 5 1⁄2 5 2 1⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 146AT 3 1⁄2 5 1⁄2 5 1⁄2 2 3⁄4
11⁄32 dia.
2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 148AT 3 1⁄2 5 1⁄2 7 2 3⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 149AT 3 1⁄2 5 1⁄2 8 2 3⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 1412AT 3 1⁄2 5 1⁄2 11 2 3⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 182 4 1⁄2 7 1⁄2 4 1⁄2 2 3⁄4
13⁄32 dia.
2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 184 4 1⁄2 7 1⁄2 5 1⁄2 2 3⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 182T 4 1⁄2 7 1⁄2 4 1⁄2 2 3⁄4 2 3⁄4 1 1⁄8 2 1⁄2 1⁄4 1⁄4 1 3⁄8 184T 4 1⁄2 7 1⁄2 5 1⁄2 2 3⁄4 2 3⁄4 1 1⁄8 2 1⁄2 1⁄4 1⁄4 1 3⁄8 182AT 4 1⁄2 7 1⁄2 4 1⁄2 2 3⁄4
13⁄32 dia.
2 1⁄4 1 1⁄8 2 1⁄4 1⁄4 1 3⁄8 L182ACY 4 1⁄2 7 1⁄2 4 1⁄2 2 3⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 L182AT 4 1⁄2 7 1⁄2 4 1⁄2 2 3⁄4 2 1⁄4 1 1⁄8 2 1⁄4 1⁄4 1 3⁄8 186ACY 4 1⁄2 7 1⁄2 7 2 3⁄4 2 1⁄4 7⁄8 2 3⁄16 3⁄16 1 3⁄8 186AT 4 1⁄2 7 1⁄2 7 2 3⁄4 2 1⁄4 1 1⁄8 2 1⁄4 1⁄4 1 3⁄8 L186AT 4 1⁄2 7 1⁄2 7 2 3⁄4 2 1⁄4 1 1⁄8 2 1⁄4 1⁄4 1 3⁄8 189AT 4 1⁄2 7 1⁄2 10 2 3⁄4 2 1⁄4 1 1⁄8 2 1⁄4 1⁄4 1 3⁄8 203# 5 8 5 1⁄2 3 1⁄8 13⁄32 dia. 2 1⁄4 3⁄4 2 3⁄16 3⁄16 1 3⁄8 204# 5 8 6 1⁄2 3 1⁄8 2 1⁄4 3⁄4 2 3⁄16 3⁄16 1 3⁄8 213 5 1⁄4 8 1⁄2 5 1⁄2 3 1⁄2
13⁄32 dia.
3 1 1⁄8 2 3⁄4 1⁄4 1⁄4 2 215 5 1⁄4 8 1⁄2 7 3 1⁄2 3 1 1⁄8 2 3⁄4 1⁄4 1⁄4 2 213T 5 1⁄4 8 1⁄2 5 1⁄2 3 1⁄2 3 3⁄8 1 3⁄8 3 1⁄8 5⁄16 5⁄16 2 3⁄8 215T 5 1⁄4 8 1⁄2 7 3 1⁄2 3 3⁄8 1 3⁄8 3 1⁄8 5⁄16 5⁄16 2 3⁄8 219AT 5 1⁄4 8 1⁄2 11 3 1⁄2 13⁄32 dia. 2 3⁄4 1 3⁄8 2 1⁄2 5⁄16 5⁄16 1 3⁄4 2110AT 5 1⁄4 8 1⁄2 12 1⁄2 3 1⁄2 2 3⁄4 1 3⁄8 2 1⁄2 5⁄16 5⁄16 1 3⁄4 224# 5 1⁄2 9 6 3⁄4 3 1⁄2 13⁄32 dia. 3 1 2 3⁄4 1⁄4 1⁄4 2 225# 5 1⁄2 9 7 1⁄2 3 1⁄2 3 1 2 3⁄4 1⁄4 1⁄4 2 254# 6 1⁄4 10 8 1⁄4 4 1⁄4 21⁄32 dia. 3 3⁄8 1 1⁄8 3 1⁄8 1⁄4 1⁄4 2 3⁄8 254U 6 1⁄4 10 8 1⁄4 4 1⁄4
17⁄32 dia.
3 3⁄4 1 3⁄8 3 1⁄2 5⁄16 5⁄16 2 3⁄4 256U 6 1⁄4 10 10 4 1⁄4 3 3⁄4 1 3⁄8 3 1⁄2 5⁄16 5⁄16 2 3⁄4 254T 6 1⁄4 10 8 1⁄4 4 1⁄4 4 1 5⁄8 3 3⁄4 3⁄8 3⁄8 2 7⁄8 256T 6 1⁄4 10 10 4 1⁄4 4 1 5⁄8 3 3⁄4 3⁄8 3⁄8 2 7⁄8 284# 7 11 9 1⁄2 4 3⁄4 21⁄32 dia. 3 3⁄4 1 1⁄4 3 1⁄2 1⁄4 1⁄4 2 3⁄4 284U 7 11 9 1⁄2 4 3⁄4
17⁄32 dia.
4 7⁄8 1 5⁄8 4 5⁄8 3⁄8 3⁄8 3 3⁄4 286U 7 11 11 4 3⁄4 4 7⁄8 1 5⁄8 4 5⁄8 3⁄8 3⁄8 3 3⁄4 284T 7 11 9 1⁄2 4 3⁄4 4 5⁄8 1 7⁄8 4 3⁄8 1⁄2 1⁄2 3 1⁄4 286T 7 11 11 4 3⁄4 4 5⁄8 1 7⁄8 4 3⁄8 1⁄2 1⁄2 3 1⁄4 284TS 7 11 9 1⁄2 4 3⁄4 3 1⁄4 ^ 1 5⁄8 ^ 3 ^ 3⁄8 3⁄8 1 7⁄8 ^ 286TS 7 11 11 4 3⁄4 3 1⁄4 ^ 1 5⁄8 ^ 3 ^ 3⁄8 3⁄8 1 7⁄8 ^ 324# 8 12 1⁄2 10 1⁄2 5 1⁄4 21⁄32 dia. 4 7⁄8 1 5⁄8 4 5⁄8 3⁄8 3⁄8 3 3⁄4 326# 8 12 1⁄2 12 5 1⁄4 4 7⁄8 1 5⁄8 4 5⁄8 3⁄8 3⁄8 3 3⁄4 324U 8 12 1⁄2 10 1⁄2 5 1⁄4
21⁄32 dia.
5 5⁄8 1 7⁄8 5 3⁄8 1⁄2 1⁄2 4 1⁄4 326U 8 12 1⁄2 12 5 1⁄4 5 1⁄4 1 7⁄8 5 3⁄8 1⁄2 1⁄2 4 1⁄4 324T 8 12 1⁄2 10 1⁄2 5 1⁄4 5 1⁄4 2 1⁄8 5 1⁄2 1⁄2 3 7⁄8 326T 8 12 1⁄2 12 5 1⁄4 5 1⁄4 2 1⁄8 5 1⁄2 1⁄2 3 7⁄8 324TS 8 12 1⁄2 10 1⁄2 5 1⁄4 3 3⁄4 ^ 1 7⁄8 ^ 3 1⁄2 ^ 1⁄2 1⁄2 2 ^ 326TS 8 12 1⁄2 12 5 1⁄4 3 3⁄4 ^ 1 7⁄8 ^ 3 1⁄2 ^ 1⁄2 1⁄2 2 ^ 364# 9 14 11 1⁄4 5 7⁄8 21⁄32 dia. 5 5⁄8 1 7⁄8 5 3⁄8 1⁄2 1⁄2 4 1⁄4 364S# 9 14 11 1⁄4 5 7⁄8 3 1⁄4 1 5⁄8 3 3⁄8 3⁄8 1 7⁄8 365# 9 14 12 1⁄2 5 7⁄8 5 5⁄8 1 7⁄8 5 3⁄8 1⁄2 1⁄2 4 1⁄4 364U 9 14 11 1⁄4 5 7⁄8 21⁄32 dia. 6 3⁄8 2 1⁄8 6 1⁄8 1⁄2 1⁄2 5 365U 9 14 12 1⁄2 5 7⁄8 6 3⁄8 2 1⁄8 6 1⁄8 1⁄2 1⁄2 5 364T 9 14 11 1⁄4 5 7⁄8
21⁄32 dia.
5 7⁄8 2 3⁄8 5 7⁄8 5⁄8 5⁄8 4 1⁄4 365T 9 14 12 1⁄4 5 7⁄8 5 7⁄8 2 3⁄8 5 7⁄8 5⁄8 5⁄8 4 1⁄4 364TS 9 14 11 1⁄4 5 7⁄8 3 3⁄4 ^ 1 7⁄8 ^ 3 1⁄2 ^ 1⁄2 1⁄2 2 ^ 365TS 9 14 12 1⁄4 5 7⁄8 3 3⁄4 ^ 1 7⁄8 ^ 3 1⁄2 ^ 1⁄2 1⁄2 2 ^ 404T 10 16 12 1⁄4 6 5⁄8
13⁄16 dia.
7 1⁄4 2 7⁄8 7 3⁄4 3⁄4 5 5⁄8 405T 10 16 13 3⁄4 6 5⁄8 7 1⁄4 2 7⁄8 7 3⁄4 3⁄4 5 5⁄8 404TS 10 16 12 1⁄4 6 5⁄8 4 1⁄4 ^ 2 1⁄8 ^ 4 ^ 1⁄2 1⁄2 2 3⁄4 ^ 405TS 10 16 13 3⁄4 6 5⁄8 4 1⁄4 ^ 2 1⁄8 ^ 4 ^ 1⁄2 1⁄2 2 3⁄4 ^ 404U 10 16 12 1⁄4 6 5⁄8 7 1⁄8 2 3⁄8 6 7⁄8 5⁄8 5⁄8 5 1⁄2 405U 10 16 13 3⁄4 6 5⁄8 7 1⁄8 2 3⁄8 6 7⁄8 5⁄8 5⁄8 5 1⁄2 444T 11 18 14 1⁄2 7 1⁄2
13⁄16 dia.
8 1⁄2 3 3⁄8 8 1⁄4 7⁄8 7⁄8 6 7⁄8 445T, 447T§§ 11 18 16 1⁄2 7 1⁄2 8 1⁄2 3 3⁄8 8 1⁄4 7⁄8 7⁄8 6 7⁄8
444TS, 447TS§§ 11 18 14 1⁄2 7 1⁄2 4 3⁄4 ^ 2 3⁄8 ^ 4 1⁄2 ^ 5⁄8 5⁄8 3 ^
445TS 11 18 16 1⁄2 7 1⁄2 4 3⁄4 ^ 2 3⁄8 ^ 4 1⁄2 ^ 5⁄8 5⁄8 3 ^ 444U 11 18 14 1⁄2 7 1⁄2
13⁄16 dia.
8 5⁄8 2 7⁄8 8 3⁄8 3⁄4 3⁄4 7 445U 11 18 16 1⁄2 7 1⁄2 8 5⁄8 2 7⁄8 8 3⁄8 3⁄4 3⁄4 7 449T 11 18 25 7 1⁄2 8 1⁄2 3 3⁄8 8 1⁄4 7⁄8 7⁄8 6 7⁄8 449TS 11 18 25 7 1⁄2 4 3⁄4 ^ 2 3⁄8 ^ 4 1⁄2 ^ 5⁄8 5⁄8 3 ^
*
Dimension "D" will never be greater than the above values on rigid mount motors, but it may be less so that shims up to 1⁄32" thick (1⁄16" on 364U and 365U frames) may be required for certain machines.
** Base of Dayton 56HZ frame motors has holes and slots to match NEMA 56, 56H and 145T mounting dimensions.
†
Certain NEMA 56Z frame motors have 1⁄2" dia. x 1 1⁄2" long shaft with 3⁄64" flat." These exceptions are noted in this catalog. ‡ Designated 56H motors have 2 sets of 2F mounting holes—3" and 5".
§
Dimension "V" is shaft length available for coupling, pinion, or pulley hub—this is a minimum value. ^ Standard short shaft for direct-drive applications. # Discontinued NEMA frame. §§ The 2F dimension is 20.
NEMA
Face
Shaft
Rabbet
Dia.
Bolt Circle
Dia. Dia.
(U)
Long (N-W) 42C 3⁄8 1 1⁄8 3 3 3⁄4 48C 1⁄2 1 1⁄2 3 3 3⁄4 56C 5⁄8 1 7⁄8 4 1⁄2 5 7⁄8 56HC‡ 5⁄8 1 7⁄8 4 1⁄2 5 7⁄8 56J 5⁄8 2 7⁄16 4 1⁄2 5 7⁄8 143TC & 145TC 7⁄8 2 1⁄4 4 1⁄2 5 7⁄8 146ATC & 1412ATC 7⁄8 2 1⁄4 4 1⁄2 5 7⁄8 L182ACY & 186ACY 7⁄8 2 1⁄4 4 1⁄2 5 7⁄8 182TC & 184TC 1 1⁄8 2 3⁄4 8 1⁄2 7 1⁄4 186ATC & 189ATC 1 1⁄8 2 1⁄4 8 1⁄2 7 1⁄4 213TC & 215TC 1 3⁄8 3 3⁄8 8 1⁄2 7 1⁄4 219ATC & 2110ATC 1 3⁄8 2 3⁄4 8 1⁄2 7 1⁄4 254TC & 256TC 1 5⁄8 4 8 1⁄2 7 1⁄4 284TC & 286TC 1 5⁄8 4 5⁄8 10 1⁄2 9
NEMA C- and J-Face Mounting Dimensions Mounting dimensions of the 56J-Face are exactly the same as the NEMA 56C. 56J-Face has a threaded shaft of stainless steel while all others have a keyed steel shaft. See illustrations and table below for specifics.
182TC THRU 256TC - FACE DIMENSIONS
56J SHAFT
56C, 56HC, 56J, 143TC AND 145TC - FACE DIMENSIONS