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Gemfan · Propellers

Gemfan 1210-2 (31 mm)

Bi-blade 31 mm prop for 1 mm shafts.

Specification last checked 2026-07-27

  • Propeller size1.22 inDecides what it fits
  • Propeller mounting1 mm press fitDecides what it fits
  • Propeller pitch1 inHow far the prop screws forward per revolution: the second figure in "5x4.3x3".
  • Blades2The third figure in "5x4.3x3".
Compatibility

What this fits

Checked against every other product in the catalog by the same engine the planner runs, rule by rule. Where a specification is missing the answer is unknown, which is a different answer from compatible.

Complete drone

Works with (31)87 not yet judged
Show the 87 we cannot judge yet, because a deciding specification is not recorded

Frame

Works with (4)16 for other sizes
Show the 16 made for a different size or voltage

Motors

Does not work with (16)Works with (9)12 not yet judged
Show the 12 we cannot judge yet, because a deciding specification is not recorded
Offers

Where to buy

This listing does not say which warehouse ships it. Most orders leave China, so expect import VAT and a carrier handling fee unless an EU warehouse is chosen at checkout.

No current price: our own estimate is 30 SEK. It is a rough street figure rather than a quote, and the retailer above confirms the real one.

Some links on this page earn us a commission at no extra cost to you, and that never affects any verdict on it. How this is funded.

Evidence

Recorded specification

Every value carries the source it was read from. A property with no recorded source is marked as such rather than presented as a fact. If one of them is wrong, tell us: it is the fastest way it gets fixed.

PropertyValueSource
Propeller size decides fit1.22 inOscar Liangchecked 2026-07-27Quote 1, below the table
Propeller pitchHow far the prop screws forward per revolution: the second figure in "5x4.3x3". More pitch trades grip for top speed, so no direction.1 inRaceDayQuads product specificationschecked 2026-07-27Quote 2, below the table
BladesThe third figure in "5x4.3x3". More blades grip harder and drain the battery faster.2RaceDayQuads product specificationschecked 2026-07-27Quote 2, below the table
Propeller mounting decides fitHow the propeller attaches: threaded 5 mm shaft with a nut, T-mount screws, or pressed onto a bare shaft it must match exactly. A prop made for one cannot be fitted to another.1 mm press fitRaceDayQuads product specificationschecked 2026-07-27Quote 2, below the table
WeightBuild-critical rather than compat-critical: needed to answer registration and class questions.0.19 gRaceDayQuads product specificationschecked 2026-07-27Quote 2, below the table
  1. Oscar Liangchecked 2026-07-27Gemfan 31mm 1210-2 / 1.2" Bi-Blade Micro/Whoop FPV Drone Props for 1mm Shaft
  2. RaceDayQuads product specificationschecked 2026-07-27Gemfan Durable 1210 Bi-Blade 31mm Micro/Whoop Prop 8 Pack (1mm Shaft); Diameter: 1.2"; Pitch: 1"; Shaft Size: 1mm; Weight: 0.19g
Guides

The standards this part is judged by

What the properties above actually mean, which differences are absolute, and where the names used in shops mislead.