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Cotter pins which material is correct ?

bubinga

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Joined
Jul 26, 2014
Messages
12,744
Location
Bridgeport Ohio. (Across River From Wheeling WV)
Now you've seen those pics I posted you will notice the half-assery when it comes to cotterpins while watching various shows on MotorTrend etc. Those so called experts at "The Guild" in Canada are always making an *** of it.
PA State Police used to oversee the state inspections in PA I guess they still do but they told us we weren't allowed to do it like you show here (see picture) we had to do it the first way you showed. ......lol
He said it's rare but I've seen them pull out another words fall out how in the heck would it fall out what is Casper the ghost in there?
 

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cvairwerks

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Joined
Aug 12, 2016
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7,200
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Within hearing distance of Texas Motor Speedway
how the hell do you people get the fancy precise bends out of these fuckers that are constantly trying to turn and move when trying to bend them?
Couple of different ways...For over the top, pull the long tail quite hard with a set of duckbills and make the first corner over the top. Trim the short leg and use a broad punch and a hammer to make the fold down the nut. It can also be done with duckbills with some practice. Sung the top with the punch and trim.

For around the nuts, hold the bolt head with a wrench. Pull one leg hard with the duckbills and pull around the nut, or use the wrench to turn the bolt while holding the duckbills. Occasionally, you have to use a flat blade screwdriver to spread the legs and fold them around the nut.

There are other methods that people use, but mainly it's because of practice that one develops their own methods for different installation locations.

Btw, in bubinga's photo above, the legs were hammered down with a punch after initial bending. If you bring the photo up to full size, you can see the distortion.
 

Honch

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Joined
Jul 30, 2011
Messages
401
Location
Danville, IN
I have seen aluminum cotter pins used to secure clevis pins where the cotter key has no shear load, never to secure a castle nut on a bolt or threaded clevis pin.

SYCNZNS3RSTG5QEDAMTT6Q2A2I.jpg

In aviation AN381 corrosion-resistant steel cotter pin is used in locations where nonmagnetic material is required or in locations where resistance to corrosion is desired. Very common landing gear, wheels, brakes, flap rollers etc.
 

Walkers

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Joined
May 17, 2021
Messages
3,912
Location
Cave Creek Az
I had a set of cotter pins from a junk store, not HF, some other place and I swore they were aluminum as well. I think they were really just really soft steel. had some safety pins I got there like that too, had no spring, you closed it and it just bent.

OTOH, I can't count how many times i've opened up a dust cap on an old beater and someone just stuck a nail in there...
Well yeah, but how did they bend the nail? That is the important part.
 
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Bagherra

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Joined
Jun 3, 2012
Messages
768
Location
Virginia Beach, VA
I typically buy mine in bulk from skygeek.com. You just need to know the correct MS part number.

At work, we’ve pretty much quit using safety wire and have gone to safety cable. A little more costly on the materials and tools, but way cheaper on labor. Even the least competent mechanics here can do cables in a single try.
I always did like the cable safeties....didnt get to use much on Black Hawks and Hueys...
 
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