EMAX ECO 1404

What you get for $20.00

• 8.6 g

  8.6 g without leads, on an 18.8 mm bell.

  Source: EMAX product page, EMAX spec sheet

• Three windings

  The same 1404 stator wound for 3700KV (2S–4S), 4800KV (2S–3S) and 6000KV (2S).

  Source: EMAX spec sheet, EMAX USA 4800KV page

• Steel shaft, anodised finish

  A steel shaft, which EMAX says adds strength, and an anodised finish against corrosion.

  Source: EMAX product page

• Four M2 holes for the prop

  The bell top has four M2 holes around the 1.5 mm shaft.

  Source: EMAX spec sheet

What to pair it with

Our reading of EMAX’s numbers, so your build matches what the motor was tested with.

ESC

EMAX gives a peak current of 12 A for the 3700KV on 3S and 14 A for the 6000KV. A 15 A or bigger ESC covers both. (EMAX spec sheet)

Props

EMAX’s spec sheet lists 2 to 3-inch props; its product pages say 2.5 to 4 inches, with 3–4-inch props for the 3700KV and 2.5–3-inch props for the 4800KV and 6000KV. (EMAX spec sheet, EMAX product page, EMAX USA 3700KV page, EMAX USA 4800KV page, EMAX USA 6000KV page)

Battery

2S–4S for the 3700KV, 2S–3S for the 4800KV, 2S for the 6000KV. (EMAX spec sheet, EMAX USA 4800KV page)

Frame

Four M2 holes on a 9 mm circle (9 × 9 mm), which EMAX says fits the most common micro quad frames. (EMAX spec sheet, EMAX USA 6000KV page)

Where to buy

• EMAX USAthe maker’s US store; 6000KV (its 3700KV and 4800KV pages were listed as sold out)
  $12.99seen Oct 19, 2026
  Visit
• EMAXthe maker’s global store; all three KVs
  $20.00seen Oct 19, 2026
  Visit
• RaceDayQuads3700KV
  price on the store’s page
  Visit
• Pyrodrone3700KV
  price on the store’s page
  Visit
• GetFPV3700KV
  price on the store’s page
  Visit
• RaceDayQuads6000KV
  price on the store’s page
  Visit

Plain links, not affiliate links. Prices change; the store’s page has the current one.

Full specs

Inside the motor

A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:

• Shaft. Steel; 1.5 mm prop-adapter shaft protruding 4.1 mm; 2 mm through the bearings. (EMAX product page, EMAX spec sheet)
• Bell. Anodised; four M2 holes in the top for the prop. (EMAX product page, EMAX spec sheet)
• Stator. The coils are wound on a stack of thin steel laminations: 14 × 4 mm (1404). (EMAX product page)
• Winding. Multi-strand copper. (EMAX product page)
• Bearings. Precision ball bearings. (EMAX product page)
• Base. 4 × M2 holes on a 9 mm circle (9 × 9 mm). (EMAX spec sheet, EMAX product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3700KV version reaches about these speeds; a prop loads the motor and brings it down, typically to around 70–75% of these figures at full throttle.

A 12-pole rotor has 6 pole pairs, so every turn of the shaft is 6 electrical cycles, and a six-step ESC switches the phases 36 times per turn.

About the 3D model

A generic outrunner drawn from EMAX’s published sizes: the 14 × 4 mm stator, 18.8 mm bell, 14.1 mm height, 1.5 mm shaft, 9 mm mounting circle and 9 teeth and 12 magnets. Anything EMAX doesn’t publish is typical for a motor this size, and the bell’s spoked top, the base and the inside are a generic design, not this motor’s. The colours are read off the maker’s product photos. There are no logos or markings: it is our drawing, not the maker’s.

Sources

1. EMAX: ECO Micro 1404 3700KV 4800KV 6000KV (product page on EMAX’s global store). Retrieved Oct 19, 2026.
2. EMAX: ECO 1404 spec sheet (dimension drawing and spec table for 3700KV and 6000KV; image on EMAX’s product pages). Retrieved Oct 19, 2026.
3. EMAX USA: ECO Micro Series 1404 6000KV (product page). Retrieved Oct 19, 2026.
4. EMAX USA: ECO Micro Series 1404 4800KV (product page). Retrieved Oct 19, 2026.
5. EMAX USA: ECO Micro Series 1404 3700KV (product page). Retrieved Oct 19, 2026.