37d-21.5 Gearmotor (Gear Motor), Pololu gearmotor

The 37d-21.5 gearmotor (Pololu gearmotor) has a gearbox 36.8 mm across and 21.5 mm long on a motor 30.7 mm long; the output is a 6 mm D-shaft, 5.4 mm across the flat and 22 mm long. It mounts by six M3 holes on a 31 mm circle. Modeled as simplified STEP files.

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

• Also searched as: 37d-21.5 gearmotor
• Model id: gearmotors-pololu-37d-21-5
• Standard: Pololu gearmotor · size 37d-21.5

Files

Part key	Simplified
gearmotors-pololu-37d-21-5	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
D	Gearbox diameter		36.8		36.8	nominal	L2
Lg	Gearbox length		21.5		21.5	nominal	L2
Lm	Motor length		30.7		30.7	nominal	L2
Dm	Motor diameter		34.8		34.8	nominal	L2
E	Shaft length		22		22	nominal	L2
d	Shaft diameter		6		6	nominal	L2
f	Shaft across the flat		5.4		5.4	nominal	L2
B	Front boss diameter		12		12	nominal	L2
h	Front boss height		6		6	nominal	L2
eo	Shaft offset		7		7	nominal	L2
dt	Mounting hole thread		3		3	nominal	L2
nh	Number of mounting holes		6		6	nominal	L2
th	Mounting hole depth		3		3	nominal	L2
Pc	Mounting hole circle		31		31	nominal	L2
ph	Adjacent hole spacing		15.5		15.5	nominal	L2
Br	Rear boss diameter		7.8		7.8	nominal	L2
hr	Rear boss height		1.6		1.6	nominal	L2
lt	Terminal reach		5		5	nominal	L2
pt	Terminal spacing		22.5		22.5	nominal	L2
tw	Terminal width		2.9		2.9	nominal	L2
tt	Terminal thickness		0.5		0.5	nominal	L2
le	Encoder length		15.4		15.4	nominal	L2
De	Encoder diameter		34		34	nominal	L2

Drawing

As a PDF: CC-GM-POLOLU-SZ-37d-21.5.pdf.

The 37d-21.5 gearmotor beside the 25d-27 and the 37d-24

The 37d-21.5 is number 7 of the 9 Pololu gearmotor gearmotors published here, listed from 25d-17 to 37d-26.5.

• Gearbox diameter (D): 36.8 mm on the 37d-21.5 gearmotor, against 25 mm on the 25d-27 and 36.8 mm on the 37d-24.
• Gearbox length (Lg): 21.5 mm on the 37d-21.5 gearmotor, against 27 mm on the 25d-27 and 24 mm on the 37d-24.
• Motor length (Lm): 30.7 mm on the 37d-21.5 gearmotor, against 30.8 mm on the 25d-27 and 30.7 mm on the 37d-24.
• Motor diameter (Dm): 34.8 mm on the 37d-21.5 gearmotor, against 24.4 mm on the 25d-27 and 34.8 mm on the 37d-24.
• Shaft length (E): 22 mm on the 37d-21.5 gearmotor, against 12.5 mm on the 25d-27 and 22 mm on the 37d-24.
• Shaft diameter (d): 6 mm on the 37d-21.5 gearmotor, against 4 mm on the 25d-27 and 6 mm on the 37d-24.
• Shaft across the flat (f): 5.4 mm on the 37d-21.5 gearmotor, against 3.5 mm on the 25d-27 and 5.4 mm on the 37d-24.
• Front boss diameter (B): 12 mm on the 37d-21.5 gearmotor, against 7 mm on the 25d-27 and 12 mm on the 37d-24.

The 37d-21.5 gearmotor in its other versions

• 37d-21.5-ENC Gearmotor (Gear Motor), With Encoder, Pololu gearmotor, with the same values.

Other sizes

• One size smaller: 25d-27 Gearmotor (Gear Motor), Pololu gearmotor, 25 mm gearbox, 27 mm long, 4 mm D-shaft, Pololu and TT Motor data.
• One size larger: 37d-24 Gearmotor (Gear Motor), Pololu gearmotor, 36.8 mm gearbox, 24 mm long, 6 mm D-shaft, M3 mounting holes on a 31 mm circle, Pololu data.

Documents

• CC-GM-POLOLU-DS-37d-21-5.pdf: 37d-21.5 datasheet: values with levels, sources
• CC-GM-POLOLU-SZ-37d-21.5.pdf: 37d-21.5 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

nfp-gm37-520, pololu-37d-gearmotors. Full citations: the method page and this size's datasheet.

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