×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

cotter pin size vs. shaft size

cotter pin size vs. shaft size

cotter pin size vs. shaft size

(OP)
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

RE: cotter pin size vs. shaft size

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.

RE: cotter pin size vs. shaft size

(OP)
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 -

RE: cotter pin size vs. shaft size

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

http://eurobolt.com.pl/!en/138,din-94--pn-82001--i...

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

RE: cotter pin size vs. shaft size

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

RE: cotter pin size vs. shaft size

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.

RE: cotter pin size vs. shaft size

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: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: cotter pin size vs. shaft size

Quote (looslib)

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?

RE: cotter pin size vs. shaft size

(OP)
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 -

RE: cotter pin size vs. shaft size

Buy them some bigger pliers. :)

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources