Founded in 1990, China Famen Bearing Co., Ltd. is specialized drill bushing manufacturer and drill bushings distributor of all types of custom and cheap bearings. We obtained ISO9002, ISO14001, and QS9000 certificates in 1995 and 1996, 1999 respectively. Other advanced equipments include four RGB and RCI series heat treatment production lines with a treatment quantity totaling 1,500 kilograms per hour. The Multi-points temperature control meters and CNC display meters with bi-directional control have been adopted to complement these units.

Automatic mechanical/air-feed drills, tappers and back spotfacers are equipped with either a short/a long nose piece depending upon the length of the cutting tool holding device - i.e. drill chuck, tap chuck, morse taper adaptor, etc. Reducer bushings are occasionally used to reduce the thread size in a specific nose piece to adapt it to accommodate smaller thread drill bushing tips. Close fit between mating shank of tip and hole in lock liner bushing holds tool in alignment to produce straight close-tolerance holes. Milled slots give quick, positive lock of drill bushing tip under heads of lock screws. A 30o turn locks/unlocks the drill bushing tip.Square shoulder and concentric alignment diameter accurately line up drill bushing tip with axis of tool.

Drill bushing tips are constructed by a two--piece method consisting of a collar and a pressed-in shank. The collar contains the screw threads, alignment diameter and the lock flange. The shank contains the A, B, and dimensions listed in the chart. Maximum and minimum drill sizes (A) for drill bushing tips are shown in the column headings of the chart. Collars/shanks only of two-piece drill bushing tips may be ordered separately for replacement purposed: (See "ordering Information.")
Collar and threads are heat treated to produce strength and provide wear resistance. Shank is hardened for maximum wear resistance.
Marked with part number and drill size for easy identification and simplicity in reordering.
Precision ground shank, with entering bevel for easy insertion in lock liner bushing.
Collar has blackened finish for resistance to rust and corrosion.

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