Degree countersink #10 screws
 

Having trouble finding this answer.. Which countersink do I need for the #10 screws on the rudder? Is it 82 degrees, or a 100 degree rivet countersink? On that note, what would the 130/120 countersink so be needed for?

The #10 screws have 100 degree heads, the countersunk pulled rivets used on our RVs typically have 120 degree countersunk heads, though in the latter case I believe Vans mentions just using a 100 degree dimple or cutter for them, in the build instructions.

Thanks!!! Placing an order then.

AN426 rivets have a 100 degree head.
From our bible:

"e. Countersunk head rivets MS20426
(supersedes AN426 100-degree) are used on the exterior surfaces of aircraft to provide a smooth aerodynamic surface, and in other ap- plications where a smooth finish is desired. The 100-degree countersunk head has been adopted as the standard in the United States."

You might be thinking of pulled rivets.

The only "oddball" countersink on the Van's aircraft is for the CS4-4 pulled, countersunk rivets. Those are 120 degrees.

"AN" solid rivets and "AN" screws have 100? heads.
Pulled rivets typically have 120? heads.
Non-aircraft screws typically have 82? heads.

Thanks! I was lookin in the manual before I ordered a countersink. Yard store has like 4 different degrees of the same countersink. I appreciate the help

Argh. I should type what I'm thinking, instead of what my fingers were saying. "Countersunk pulled rivets" is what I meant. Previous post edited.