cotter pin size vs. shaft size 1

[duk748]

hello - today at our place i was called out because i used a 5mm dia. cotter pin & washer on the end of a 40mm dia. shaft - i was told our shop overseas could not turn the ends up like a normal small cotter pin - i was told from now on not to use a cotter pin size that you could not use pliers to bend the ends up - i was wondering if there is a table w/ cotter p0in sizes vs. shaft size - it was used to only keep the washer in place & the shaft from moving from side to side - i would have used retaining rings but i get called out on that too because of the expense of machining - any help would be greatly appreciated - thank you

 

[MintJulep]

Other than

Cotter Pin Diameter << Shaft Diameter and Cotter Pin Strength > Load on Cotter Pin

I doubt that you will find a pre-designed cheat sheet with any engineering basis to it.

 

[duk748]

hello again & thank you for the reply - there is no load on the pin it is there just to retain the washer on the shaft - it just seems funny to have a 3mm pin on a 40mm dia shaft just so someone can use a pair of pliers to bend the ends in -

 

[CheckerHater]

Here are the some recommendations for cotter pin use I was able to find:

http://eurobolt.com.pl/!en/138,din-94--pn-82001--iso-1234-zawleczki_proste.html

For those not familiar with German language:
Splintloch ∅ = Cotter pin hole diameter
Schrauben ∅ = Bolt / screw diameter
Bolzen ∅ = Pin diameter

 

[looslib]

If I read the chart right, the 40mm shaft should have a 8mm coter pin.


"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

 

[3DDave]

It's more a matter of how long the cotterpin is. If the ends aren't long enough they can be difficult to form.

Try taking away the pliers and give them a hammer and cold-chisel.

 

[KENAT]

So if there is truly no load on the Cotter pin why not make it just about the smallest dia that you can get at the required length which is still easy to handle etc?

I.e. since there is a limited functional requirement, I'd allow manufacturing concerns drive the sizing.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[CheckerHater]

If I read the chart right, the 40mm shaft should have a 8mm cotter pin.

Pretty much. Does anybody have a copy of DIN 94 or ISO 1234 on hand to give duk748 more ammo?

 

[duk748]

hello again & thank you so much - that chart is just the ticket - i am so very greatful for all your help - at least i know myself that i was on the right track -

 

[dgallup]

Buy them some bigger pliers.

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