On critical applications such as a carb mount or a clamshell engine mount, I say Yes! It’s ok to mock up a screw line I did to test the equipment but get the right hardware before you give it to the customer. You may save yourself a call back!

FYI the Stihl 9022-341-1220 M5 x 0.8 x 48 was $2.49 USD and my dealer got it in one day!