⑤,The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread. ②,A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum head diameter. Edges of the hole shall be free from burrs.
①,Drilled hole shall be approximately perpendicular to the axis of slot and may be permitted to break through bottom of the slot.
