Range of duty cycle ms to drive RC servo motor and transfer function
Most hobby servos have a rotation angle of 90&deg; when the pulse width is varied from 1 to 2ms. The standard frame rate is 50Hz (20ms PWM period). Digital servos can often handle frame rates up to ~250Hz, but analog servos tend to misbehave (or even burn out) above 60Hz. 

There is no standard rotation direction - some go clockwise with increasing pulse width and some go anticlockwise. Maximum deflection depends on the control circuit and the mechanism. Mechanical stops are usually placed at or just before 180&deg;.    

The actual angle depends on where the arm has been set on the spline. So if you set the pulse width to eg. 1.5ms (midpoint) and want a particular arm position at this point then undo the locking screw and move the arm to the closest spline position, then adjust the pulse width to get it exactly where you want it.