I need four keyed alike medium length shackle locks. I just have the short ones, but they’re not big enough, and I don’t want the really long ones as they get in the way.

Hopefully, something better than off the shelf Master Locks. Non-TSA compliant.

For flying and locking to a heavy cable in the car for travel.

Pelican 1510 1615, 1200 size cases.

My favorite padlocks are the "Best" brand.

https://www.bestaccess.com/products/padlocks/

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I used to like the Sesamee K436 until I saw a video from the Lock Picking Lawyer. I strongly suspect TSA picked my locks and opened my rifle case.

If you really want a good one, go Abloy. They are not cheap, and you can tell just by holding one. I've used them on explosives storage cabinets and magazines for a long time.

American A51 or A5101.

I bought a set of American 1 1/2” aluminum bodied lock for this purpose. I’m for shit at linking but they are available on Amazon $140/4 matched. I appreciate the light weight, and for the purpose are plenty strong.

Thanks all!