Actually I had to use a 35mm or 40mm length bolt. The 25mm bolt ended up being too short. So 8mm bolt with 1.25 pitch and 35 or 40 mm length. Also, no one in Houston has this size machine screw. I found some on the web but I wasn't waiting. Ace, Home Depot, Lowes, et al, only carried this size in bolts and not machine screws. So i ended up using a bolt screw. A little more difficult to wrench in because of where the head sits next to the metal frame.

...pass the beer nuts.

The last TWO Omni Mount articulating arm FPCLs I used for 26" LCDs did not have the right length screws to go from the mount to the adapter plate.

Second trip to the hdw store - now I have some spares. BTW, when I get enough of these mount jobs under my belt, I'm going to retire and go into the hardware business with all the screws, anchors, and hex wrenches I have left over.