DelW is right,No body plans to fail,just fail to plan.
I just took over supervising a 3 shift maintenance crew for a huge Chicago food packaging company. If i had a dollar for evrytime one of my guys that told me we were out of something that we should not have run out of,id retire at 36.
For example,we run Bartelt Vertical form,fill,and seal machines.(Dont know if anyone is familiar)Anyway,each one takes a special chain we cant put together so i have to get ot from the manufacturer.I got told last monday that i had three machines that needed these special chains a.s.a.p.They take a week to get.
When production stops,guess who gets the reaming......yep.
Order more than you think you will need,it will get used eventually.