I ordered all the parts to install an new hdd in my Z1 but Pioneer is BO on the screws and they could not tell me the screw size. The size is not shown in the service manual either.

Could someone please tell me what size the screws are and I will order some from a fastner house.

Most of us reuse the screws on the hard drive tray. You need the T-8 torx screwdriver to get them out, but that's a lot easier than dremeling them and replacing. If you do absolutely need to buy new ones, the threads are standard for 2.5" hard drives, 6-32, with a flush head. Length would probably be 3mm.

I was trying to keep my entire original Hdd & tray intact and install a new Hdd & tray complete.

Just trying to do all my reasearch while waiting for hdd & tray to arrive.

Did more research looks like these are M3x.5x3.5 and not 6-32. I know they are flat heads, do they fit into a counter sink and need a tapered bottom or just thin flat heads.

do they fit into a counter sink and need a tapered bottom or just thin flat heads.

Thin flat heads.