9 Micro Metal Gearmotor (Micro Gear Motor), N20 gearmotor

The 9 micro metal gearmotor (N20 gearmotor) has a gearbox 12 × 10 mm and 9 mm long on a motor 15.1 mm long; the output is a 3 mm D-shaft, 2.5 mm across the flat and 10 mm long. It mounts by two M1.6 holes 9 mm apart. Modeled as simplified STEP files.

How these parts are made, and what the levels mean: read the method

• Also searched as: 9 gearbox
• Model id: gearmotors-n20-9
• Standard: N20 gearmotor · size 9

Files

Part key	Simplified
gearmotors-n20-9	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
W	Gearbox width		12		12	nominal	L1
H	Gearbox height		10		10	nominal	L1
Lg	Gearbox length		9		9	nominal	L1
Lm	Motor length		15.1		15.1	nominal	L1
OL	Overall length			25.6	25.6	single limit (max), modeled at the limit	L0 (max: one source)
Dm	Motor width		12		12	nominal	L1
E	Shaft length		10		10	nominal	L1
d	Shaft diameter		3		3	nominal	L1
f	Shaft across the flat		2.5		2.5	nominal	L1
B	Front boss diameter		4		4	nominal	L1
h	Front boss height		0.8		0.8	nominal	L1
dt	Mounting hole thread		1.6		1.6	nominal	L1
nh	Number of mounting holes		2		2	nominal	L1
e	Mounting hole offset		4.5		4.5	nominal	L0 (nom: one source)
A	Mounting hole spacing		9		9	nominal	L1
Br	Rear boss diameter		5		5	nominal	L1
hr	Rear end height		1.2		1.2	nominal	L1
dr	Rear shaft diameter		1		1	nominal	L0 (nom: one source)
lr	Rear shaft length		5		5	nominal	L0 (nom: one source)
pt	Terminal spacing		6.9		6.9	nominal	L0 (nom: one source)

Drawing

As a PDF: CC-N20-SZ-9.pdf.

What each maker states

• Motor can length Lm: the makers differ (the GA12-N20 sheet 15 mm, Motraxx 15.1 mm, Pololu 15 mm, TT Motor 15 mm). The model uses the largest stated, 15.1 mm, so a mount or enclosure made to it clears every maker's motor.
• Front boss height h: the makers differ (the GA12-N20 sheet 0.7 mm, Motraxx 0.7 mm, Pololu 0.7 mm, TT Motor 0.8 mm). The model uses the largest stated, 0.8 mm, so a mount or enclosure made to it clears every maker's motor.
• This size's can is 15.1 mm. Motraxx's 15.1 mm can is drawn on its 9 mm box only, so the 12.5 mm box's can is 15 mm, though the motor behind both boxes is the same. Left at the defaults of the open decision (#1372); check your own motor's can if it matters.

The 9 micro metal gearmotor beside the 12.5

The 9 is the first of the 2 N20 gearmotor micro metal gearmotors published here, listed from 9 to 12.5.

• Gearbox width (W): 12 mm on the 9 micro metal gearmotor, the same on the 12.5.
• Gearbox height (H): 10 mm on the 9 micro metal gearmotor, the same on the 12.5.
• Gearbox length (Lg): 9 mm on the 9 micro metal gearmotor, against 12.5 mm on the 12.5.
• Motor length (Lm): 15.1 mm on the 9 micro metal gearmotor, against 15 mm on the 12.5.
• Overall length (OL): up to 25.6 mm on the 9 micro metal gearmotor, against up to 29.1 mm on the 12.5.
• Motor width (Dm): 12 mm on the 9 micro metal gearmotor, the same on the 12.5.
• Shaft length (E): 10 mm on the 9 micro metal gearmotor, the same on the 12.5.
• Shaft diameter (d): 3 mm on the 9 micro metal gearmotor, the same on the 12.5.

The 9 micro metal gearmotor in its other versions

• 9-EXT Micro Metal Gearmotor (Micro Gear Motor), Extended Rear Shaft, N20 gearmotor, with the same values.

Other sizes

• One size larger: 12.5 Micro Metal Gearmotor (Micro Gear Motor), N20 gearmotor, 12 × 10 mm gearbox, 12.5 mm long, 3 mm D-shaft, M1.6 mounting holes 9 mm apart, Pololu and TT Motor data.

Documents

• CC-N20-DS-9.pdf: 9 datasheet: values with levels, sources
• CC-N20-SZ-9.pdf: 9 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

handsontec-ga12-n20, handsontec-ga12-n20-figures, motraxx-gm12f-n20vs-298-figures, pololu-micro-metal-gearmotors, ttmotor-gm12-n20va, ttmotor-gm12-n20va-figures. Full citations: the method page and this size's datasheet.

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