NEMA-Frame Motor Shafts
NEMA-standard frame shafts, dimensioned and toleranced to NEMA MG-1.
Pick a frame below to load it into the configurator. The OD, length, keyseat, and (for JM/JP pump-mount frames) the axial impeller-retention tap are pre-dimensioned to NEMA MG-1 standards, with NEMA shaft extension tolerances applied by default. You stay in control of material, surface finish, tolerance class, and any added features. The drawing's title block stamps the source frame so any deviation from the standard is visible on the print.
Standard NEMA frame sizes
Pre-built shaft starting points sized to standard NEMA MG-1 frame dimensions, with NEMA shaft extension tolerances pre-applied. Click any frame to load it into the configurator. Material, tolerances, and added features stay editable; the drawing title block stamps the source frame so deviations are visible on the print.
Subfractional
Integral T-series
NEMA 143T
Ø7/8" × 2-1/4" shaft, 3/16 SQ key
NEMA 145T
Ø7/8" × 2-1/4" shaft, 3/16 SQ key
NEMA 182T
Ø1-1/8" × 2-3/4" shaft, 1/4 SQ key
NEMA 184T
Ø1-1/8" × 2-3/4" shaft, 1/4 SQ key
NEMA 213T
Ø1-3/8" × 3-3/8" shaft, 5/16 SQ key
NEMA 215T
Ø1-3/8" × 3-3/8" shaft, 5/16 SQ key
NEMA 254T
Ø1-5/8" × 4" shaft, 3/8 SQ key
NEMA 256T
Ø1-5/8" × 4" shaft, 3/8 SQ key
NEMA 284T
Ø1-7/8" × 4-5/8" shaft, 1/2 SQ key
NEMA 286T
Ø1-7/8" × 4-5/8" shaft, 1/2 SQ key
Large T-series
NEMA 324T
Ø2-1/8" × 5-1/4" shaft, 1/2 SQ key
NEMA 326T
Ø2-1/8" × 5-1/4" shaft, 1/2 SQ key
NEMA 364T
Ø2-3/8" × 5.880" shaft, 5/8 SQ key
NEMA 365T
Ø2-3/8" × 5.880" shaft, 5/8 SQ key
NEMA 404T
Ø2-7/8" × 7-1/4" shaft, 3/4 SQ key
NEMA 405T
Ø2-7/8" × 7-1/4" shaft, 3/4 SQ key
NEMA 444T
Ø3-3/8" × 8-1/2" shaft, 7/8 SQ key
NEMA 445T
Ø3-3/8" × 8-1/2" shaft, 7/8 SQ key
NEMA 447T
Ø3-3/8" × 8-1/2" shaft, 7/8 SQ key
NEMA 449T
Ø3-3/8" × 8-1/2" shaft, 7/8 SQ key
TS short-shaft
NEMA 284TS
Ø1-5/8" × 3-1/4" shaft, 3/8 SQ key
NEMA 286TS
Ø1-5/8" × 3-1/4" shaft, 3/8 SQ key
NEMA 324TS
Ø1-7/8" × 3-3/4" shaft, 1/2 SQ key
NEMA 326TS
Ø1-7/8" × 3-3/4" shaft, 1/2 SQ key
NEMA 364TS
Ø1-7/8" × 3-3/4" shaft, 1/2 SQ key
NEMA 365TS
Ø1-7/8" × 3-3/4" shaft, 1/2 SQ key
NEMA 404TS
Ø2-1/8" × 4-1/4" shaft, 1/2 SQ key
NEMA 405TS
Ø2-1/8" × 4-1/4" shaft, 1/2 SQ key
NEMA 444TS
Ø2-3/8" × 4-3/4" shaft, 5/8 SQ key
NEMA 445TS
Ø2-3/8" × 4-3/4" shaft, 5/8 SQ key
NEMA 447TS
Ø2-3/8" × 4-3/4" shaft, 5/8 SQ key
NEMA 449TS
Ø2-3/8" × 4-3/4" shaft, 5/8 SQ key
C-face
NEMA 143TC
Ø7/8" × 2-1/4" shaft, 3/16 SQ key
NEMA 145TC
Ø7/8" × 2-1/4" shaft, 3/16 SQ key
NEMA 182TC
Ø1-1/8" × 2-3/4" shaft, 1/4 SQ key
NEMA 184TC
Ø1-1/8" × 2-3/4" shaft, 1/4 SQ key
NEMA 213TC
Ø1-3/8" × 3-3/8" shaft, 5/16 SQ key
NEMA 215TC
Ø1-3/8" × 3-3/8" shaft, 5/16 SQ key
NEMA 254TC
Ø1-5/8" × 4" shaft, 3/8 SQ key
NEMA 256TC
Ø1-5/8" × 4" shaft, 3/8 SQ key
NEMA 284TC
Ø1-7/8" × 4-5/8" shaft, 1/2 SQ key
NEMA 286TC
Ø1-7/8" × 4-5/8" shaft, 1/2 SQ key
NEMA 324TC
Ø2-1/8" × 5-1/4" shaft, 1/2 SQ key
NEMA 326TC
Ø2-1/8" × 5-1/4" shaft, 1/2 SQ key
JM mechanical-seal mount
NEMA 143JM
Ø7/8" × 2-7/8" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 145JM
Ø7/8" × 2-7/8" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 182JM
Ø7/8" × 2-7/8" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 184JM
Ø7/8" × 2-7/8" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 213JM
Ø7/8" × 2-7/8" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 215JM
Ø7/8" × 2-7/8" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 254JM
Ø1-1/4" × 3" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 256JM
Ø1-1/4" × 3" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 284JM
Ø1-1/4" × 3" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 286JM
Ø1-1/4" × 3" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 324JM
Ø1-1/4" × 3" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 326JM
Ø1-1/4" × 3" shaft, 1/4 SQ key, 1/2-13 tap
JP packed-pump mount
NEMA 182JP
Ø7/8" × 5.940" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 184JP
Ø7/8" × 5.940" shaft, 3/16 SQ key, 3/8-16 tap
NEMA 213JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 215JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 254JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 256JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 284JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 286JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 324JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
NEMA 326JP
Ø1-1/4" × 5-7/8" shaft, 1/4 SQ key, 1/2-13 tap
Frequently Asked Questions
A NEMA 143T frame motor expects a 7/8″ shaft with a 3/16″ keyseat at a specific length. Get the dimensions wrong and the coupling, pulley, or impeller won't mate. Loading from a frame card guarantees you start with geometry that mates to the standard motor frame. Material and process choices stay yours.
Every frame loads with NEMA MG-1 Part 4 § 4.9 shaft extension tolerances: +0.0000/−0.0005″ for shafts up to and including 1.5″ diameter, +0.0000/−0.0010″ for shafts above 1.5″. Surface finish defaults to 63 µin Ra on shaft journals, which is the NEMA bearing-fit standard. Keyseat dimensions follow ANSI B17.1. You can tighten or loosen any of these in the configurator before placing the order.
Yes. The configurator lets you edit everything. If you change the OD or shaft length, the drawing will still stamp "SOURCE: NEMA 143T" in the title block, which signals to your buyer (and to us) that the part deviates from the standard frame spec.
Both are close-coupled pump motor mounts with an axial tapped hole in the shaft end for bolting down a pump impeller. JM (mechanical-seal) uses a shorter shaft (~2.9″ for 143–215 frames). JP (packed-pump) uses a longer shaft (~5.9″) to accommodate a sleeve and packing gland.
We cover subfractional through large-frame sizes (42 through 449), including T-series (143T to 449T), TS short-shaft direct-coupled variants (284TS to 449TS), C-face TC variants (143TC to 326TC), JM mechanical-seal mounts (143JM to 326JM), and JP packed-pump mounts (182JP to 326JP). Submersibles, P-Base vertical pumps, and pool/spa motors aren't in this folder because they need features the configurator doesn't expose today (splines, integral pipe threads). Contact us if you need one and we'll add it.
Yes. The cards default to 1045 carbon steel (the most common motor-shaft alloy), but you can switch to 4140 for fatigue strength, 304/316 stainless for washdown or food-grade environments, or any other material in the configurator's material list.