I prefer these types of socket head sheet metal screws for servo mounting. they have built on flange (washer).
You might also consider the #2 size Dubro Socket Heads (DUB380, DUB381) listed with Sheet Metal Screws. These do not have a flange but make a good servo screw with the addition of a washer.
Screws included with some GWS power systems inteneded for mounting gearbox to firewall. Many possible other uses such as servo mounting screws, you name it. Small, phillips drive. Possible other GWS uses. Flat end screw intended to thread into predrilled hole. This metric screw is slightly smaller than typical 2-56 servo screws, perfect if your looking to shave some grams. Length .350" (9mm), Clearance hole/OD .068" (1.74mm), ideal threading hole .055 (1.4-1.5mm) (#54 drill bit). 4 screws per package.
SKU Number: GWSGBXS
Servo Mounting Screws
Servo mounting screws hold a servo securely in its bay or on a rail, and the small threads and heads used for this job are easy to lose or strip over time. This category collects the sizes and styles that fit common servo mounting tabs and hardwood rails on model aircraft.
Socket Head Sheet Metal Screws
The #1 socket head sheet metal screws are offered in 3/8, 7/16, and 1/2 inch lengths in packs of ten, giving you a choice of depth for different rail thicknesses. Sheet metal threads bite into wood and plastic without a pre-tapped hole.
MPJet Machine Screw Samples
For metric hardware, the MPJet M1 screw sample packs bring together brass and steel screws in countersunk, cheesehead, and related head styles, ten to a pack. These variety packs are handy when you are matching an existing fastener or trying a head shape for the first time.
Look through the sizes below to find the servo screws your build calls for.
 "#1 x 3/8\" Socket Head Sheet Metal Screw, Qty 10")
 "#1 x7/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#1 x 1/2\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 5/8\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 5/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 1/2\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 5/16\" Socket Head Sheet Metal Screw, Qty 100")
 "#2 x 5/16\" Socket Head Sheet Metal Screw, Qty 50")
 "#2 x 7/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 7/16\" Socket Head Sheet Metal Screw, Qty 100")
 "#2 x 7/16\" Socket Head Sheet Metal Screw, Qty 50")
 "#2 x 9/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 9/16\" Socket Head Sheet Metal Screw, Qty 100")
 "#2 x 9/16\" Socket Head Sheet Metal Screw, Qty 50")
 "#2 x 3/4\" Socket Head Sheet Metal Screw, Qty 10")
 "#2 x 3/4\" Socket Head Sheet Metal Screw, Qty 100")
 "#2 x 3/4\" Socket Head Sheet Metal Screw, Qty 50")
 "#3 x 7/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#3 x 7/16\" Socket Head Sheet Metal Screw, Qty 50")
 "#3 x 7/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#3 x9/16\" Socket Head Sheet Metal Screw, Qty 10")
 "#3 x9/16\" Socket Head Sheet Metal Screw, Qty 100")
 "#3 x 5/8\" Socket Head Sheet Metal Screw, Qty 10")
 "#3 x 5/8\" Socket Head Sheet Metal Screw, Qty 100")
 "GWS Gearbox / Servo Mounting Screws, Pack of 4")
