40t-8 Timing Pulley (Timing Belt Pulley), GT2 pulley

Over its flanges the 40t-8 timing pulley (GT2 pulley) is 30.734 mm across and over its 40 teeth 24.96 mm; the 8 mm bore is held by M4 set screws in a hub 19.1516 mm across, 18.2626 mm long overall. Download it as simplified STEP files.

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

• Also searched as: 40t-8 pulley
• Model id: gt2-pulleys-40t-8
• Standard: GT2 pulley · size 40t-8

Files

Part key	Simplified
gt2-pulleys-40t-8	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
dp	Pitch diameter		25.46		25.46	nominal	L1
da	Outside diameter		24.96		24.96	nominal	L1
df	Flange diameter		30.734		30.734	nominal	L1
b	Face width between the flanges		7.366		7.366	nominal	L1
bf	Width over the flanges		10.3		10.3	nominal	L0 (nom: one source)
L	Overall length		18.2626		18.2626	nominal	L1
dh	Hub diameter		19.1516		19.1516	nominal	L1
lh	Hub length		7.9756		7.9756	nominal	L0 (nom: one source)
de	Face diameter inside the flanges		21		21	nominal	L0 (nom: one source)
ds	Set screw thread		4		4	nominal	L1

Drawing

As a PDF: CC-GT2-SZ-40t-8.pdf.

The 40t-8 timing pulley beside the 40t-5 and the 60t-8

The 40t-8 is number 6 of the 7 GT2 pulley timing pulleys published here, listed from 16t-5 to 60t-8.

• Pitch diameter (dp): 25.46 mm on the 40t-8 timing pulley, against 25.46 mm on the 40t-5 and 38.2 mm on the 60t-8.
• Outside diameter (da): 24.96 mm on the 40t-8 timing pulley, against 24.96 mm on the 40t-5 and 37.69 mm on the 60t-8.
• Flange diameter (df): 30.734 mm on the 40t-8 timing pulley, against 30.734 mm on the 40t-5 and 43.942 mm on the 60t-8.
• Face width between the flanges (b): 7.366 mm on the 40t-8 timing pulley, the same on the 40t-5 and the 60t-8.
• Width over the flanges (bf): 10.3 mm on the 40t-8 timing pulley, the same on the 40t-5 and the 60t-8.
• Overall length (L): 18.2626 mm on the 40t-8 timing pulley, the same on the 40t-5 and the 60t-8.
• Hub diameter (dh): 19.1516 mm on the 40t-8 timing pulley, against 19.1516 mm on the 40t-5 and 31.0388 mm on the 60t-8.
• Hub length (lh): 7.9756 mm on the 40t-8 timing pulley, the same on the 40t-5 and the 60t-8.

Other sizes

• One size smaller: 40t-5 Timing Pulley (Timing Belt Pulley), GT2 pulley, 40 teeth, 5 mm bore, pitch diameter 25.46 mm, M3 set screws.
• One size larger: 60t-8 Timing Pulley (Timing Belt Pulley), GT2 pulley, 60 teeth, 8 mm bore, pitch diameter 38.2 mm, M4 set screws.

Documents

• CC-GT2-DS-40t-8.pdf: 40t-8 datasheet: values with levels, sources
• CC-GT2-SZ-40t-8.pdf: 40t-8 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

gates-light-power-precision, misumi-gpa-2gt, sdpsi-gt2-molded-6mm. Full citations: the method page and this size's datasheet.

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