Help Locating A Square Lock Pin

[nafterclifen]

Why is it so hard to find a simple square lock pin?!? They're commonly used on heavy duty trailer jacks to raise/lower the adjustable foot. I have one sitting in front of me so I know they exist. Pin diameter is 9/16" and total pin length is 3.5". I need another one but I can't find them anywhere! Attached is a picture.

McMaster Car calls them 'Wire-Lock Clevis Pins'
Fastenal calls them 'Snapper and Tab-Lock Pins'
Grainger calls them 'Safety Pins'

 

[nadogail]

If you find them listed with Mc Master, Fastenal & Grainger, why are you asking for help locating them?

 

[yatg]

https://www.etrailer.com/Hitch-Pins-and-Clips/Bulldog/BD500219.html

 

[nafterclifen]

If you find them listed with Mc Master, Fastenal & Grainger, why are you asking for help locating them?

They don't have the size I need.

https://www.etrailer.com/Hitch-Pins-and-Clips/Bulldog/BD500219.html

Yes, this is it! Thank you!!

 

[Leaflessshadetree]

I get them at farm supply stores.

 

[619DioFan]

I think they are also called a PTO pin.

 

[readhead]

The pin is round. The bale is square. I buy them at tractor supply.