And almost not parts supplier will do something like consignment where you're holding parts for 8+ months and they haven't seen a dime. Much more common is a managed stock with guarantee inventory on parts. Meaning, they'll manage your inventory by tracking what you use (and stock it for you) and then high priority parts, they will keep a minimum amount in stock for you specifically (so the +1 they hold for another shop is also not your +1) and the contract guarantee means if you use your one in stock, they will have one in your hand same afternoon if you need it. But no fucking way you'd have $300,000 in unpaid fittings sitting on YOUR shelf, only being paid for at the time of use. Unless you're paying like 3x the market value. Ive worked in industrial maintenance, large scale commercial and residential new construction, reno construction, and none of the major suppliers would ever float shit like this. Maybe the closest would be a net60 or net90