For questions like this I look to Carroll Smith's book "Nuts, Bolts,
Fasteners and Plumbing Handbook" commonly referred to as "Screw to
Win." He says that your picture 2 is the preferred way, but picture
1 is an alternate method. He says:
"Insert the pin and give the closed end a tap with a drift to seat
it. Bend the ends over, one over the top of the bolt and the other
axially against one flat of the nut. If you can wiggle the cotter
pin with your fingers, you did it wrong."
At 12:36 PM 11/17/2020, Bob Spidell wrote:
>Content-Transfer-Encoding: 7bit
>
>Got some 'quiet time' before I have to go look after my mom, and I
>thought I'd pose an arcane question to the List:
>
>What do y'all consider the proper way to use a cotter key/pin? I've
>watched the pros on TV--Edd China, Ant Anstead, Goblin Garage,
>Fantomworks, etc. and the 'Chop it/Channel It/Drop a Crate Engine In
>It/Bag It/Put Huge Dubs and a Gaudy Paint Job On It and Call It a
>Day' hotrod builders, and they all do it a bit different. Usually,
>it's 'Type 1'--see terrible hand-drawn 'art' attached (using a stub
>axle for example)--but I gave it a lot of thought and wondered 'Is
>that the best way?' Thinking it through, yes, any way you put a
>cotter in and secure it will do the job; i.e. keep the nut from
>coming completely undone. However, when safety-wiring--a skill I
>sorta learned maintaining my own aircraft--you're supposed to always
>wire so as to pull in the tightening direction, to resist any
>turning at all of the nut/bolt. So, when applicable--e.g. on
>castellated nuts--I torque until the cotter will just fit in the
>hole (drawing# 2), situated 'sideways'--where you can't see the eye
>of the cotter from the side--snug against the side of the nut's slot
>so as to resist the nut turning at all. Then, I bend the upper half
>of the cotter back over the nut/spindle, and snip the lower half at
>the edge of the nut, figuring anything longer than that isn't doing
>anything (plus it just looks neater IMO, and may be easier to remove
>if necessary).
>
>FWIW, my late father, who was an auto shop teacher and had a few
>psychology classes under his belt said I was 'stuck at the anal
>retentive stage' of child development; I (think) he was kidding.
>
>Bob
--
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