Re: Warp Drive 3-blade prop w/ HP-L hub on 912ul.

While re-torqueing my prop and 1/4" blade clamping bolts I discovered galling on a few of the clamping bolts so I'm replacing all. Unfortunately, I can't find a definitive size for the clamping bolts in my docs, on the Warp site or here, and I don't have an old bolt handy.

Can anyone confirm my best guess of AN4-20A please? Tnx