4F Spline (25 tooth)
This spline is found on most Giant scale servos like the S3306 and the S9154.
1F Spline (15 tooth)
Futaba servos such as the S3111, S3114 & S3154.
2F Spline (21 tooth)
Micro servos such as the S3153, S3107, S117 and similar have the 2F size spline.
3F Standard Spline (25 tooth)
Most standard size Futaba servos have the 3F spline.
At this time, Futaba manufactures servos with 4 different splines. When choosing components to attach to your servo, it is important to know what size of spline your servo uses. Below are the four various splines. If you have any questions as to what spline your servo has, please check the servo page or contact us via e-mail or phone.
(Splines below are not shown to scale)
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