Both the #2x7/16" and the #2x9/16" work well for most servo applications. We also carry the #3's when a slightly larger screw is needed. This item includes 100 pieces Servo Mounting Screws #2x9/16" plus 50 pieces of #3x5/8" Plus a Top-Of-The-Line Matching 5/64" Bondhus Extra Long Balldriver with 11" blade and ProGuard finish.
eBay