Chain/Sprocket Help

[Briggs8Stratton]

Hi guys, I have here a question about identifying what size/number chain and sprocket I have. How do you figure out what size a sprocket or chain is if you don't know? I need to be certain.

 

[OzFab]

Accurately measure from the tip of one tooth to the next:
- if it measures 3/8", most likely #35 chain
- if it measures 1/2", most likely #40/41 chain
- if it measures 5/8", most likely #520/530 chain

Likewise, measure the centre to centre distance between the pins in the chain

 

[itsid]

And if you also measure the roller diameter and width (inside) of the chain you can precisely identify the chain number..

Chain Number	Pitch	Roller* Width*
#35		3/8	.200	3/16
#40 (#425)	1/2	.312	5/16
#41		1/2	.306	1/4
#410 (#43)	1/2	.306	1/8
#415 (#42)	1/2	.306	3/16
#420		1/2	.306	1/4
#425 (#40)	1/2	.312	5/16
#428		1/2	.335	5/16
#520		5/8	.400	1/4
#525		5/8	.400	5/16
#530 (50)	5/8	.400	3/8

*Roller Diameter
*Width between inner plates

'sid

 

[Poboy kartman]

And if you also measure the roller diameter and width (inside) of the chain you can precisely identify the chain number..
View attachment 62536

Chain Number	Pitch	Roller* Width*
#35		3/8	.200	3/16
#40 (#425)	1/2	.312	5/16
#41		1/2	.306	1/4
#410 (#43)	1/2	.306	1/8
#415 (#42)	1/2	.306	3/16
#415H (#42H)	1/2	.306	3/16
#420		1/2	.306	1/4
#425 (#40)	1/2	.312	5/16
#428		1/2	.335	5/16
#428H		1/2	.335	5/16
#520		5/8	.400	1/4
#520H		5/8	.400	1/4
#520-2		5/8	.400	1/4
#525		5/8	.400	5/16
#530 (50)	5/8	.400	3/8

*Roller Diameter
*Width between inner plates

'sid

I'm confused....could you be more specific?

 

[itsid]

I think I could add pin diameters, tensile strength and maybe plate thicknesses as well...
but I'm not sure it'd reduce confusion

But you're right.. I should have removed the H values (since they're identical except for the plate thickness and or pin diameters
Done!

'sid

 

[Briggs8Stratton]

Are 40/41 chains/sprockets interchangeable? I need to figure out what size chain will fit a sprocket I have. I've figured out that it's either a 40 or 41 sprocket. How do I figure out which one it is? (I only have the sprocket)

 

[Poboy kartman]

#40 is wider and will fit either....IIRC...#41 is 1/4" and #40 is 5/16".....

At any rate.....sprockets are always designated as 40/41 ....because a #40 chain will work on either....

 

[Briggs8Stratton]

I just figured it out. Thanks for the help...btw whats the difference between 41 chain and 420 chain?

 

[Poboy kartman]

I just figured it out. Thanks for the help...btw whats the difference between 41 chain and 420 chain?

What's the difference between a straight six and an inline six? IDK....Look the same to me.....?

---------- Post added at 06:54 PM ---------- Previous post was at 06:51 PM ----------

i think i could add pin diameters, tensile strength and maybe plate thicknesses as well...
But i'm not sure it'd reduce confusion

But you're right.. I should have removed the h values (since they're identical except for the plate thickness and or pin diameters
done!

'sid

ahhhhh.....there it is!!!!!!

 

[itsid]

I just figured it out. Thanks for the help...btw whats the difference between 41 chain and 420 chain?

tensile strength

#41 is only good for ~2000lbs

and 420 up to 3700 (the strength of a #40 at the size of a #41 )
(caused by #40 pins... if you want to know; .156" in diameter instead of the .141" the #41 uses)

'sid