A-A-54327
5 February 1991
COMMERCIAL ITEM DESCRIPTION
DRILL, TWIST, BONE (Jacobs Chuck)
The General Services Administration has authorized the use of this Commercial Item Description as a replacement for Military Specification MIL-D-42031 (DM) which is cancelled.
This commercial item description covers Jacob chuck bone twist drill suitable for bone drilling procedures.
Salient Characteristics:
The twist drills shall be of the following sizes as indicated below:
Size 1 – 1.1 mm diameter, 45 mm long
Size 2 – 1.5 mm diameter, 70 mm long
Size 3 – 2.0 mm diameter, 85 mm long
Size 4 – 2.7 mm diameter, 85 mm long
Size 5 – 3.5 mm diameter, 95 mm long
Material. The drills shall be fabricated of class 4, type 440B martensitic corrosion-resisting steel as specified in ASTM Designation F899 for composition only.
Style, design and dimensions. The drills shall be of one-piece construction. The proximal end of the drills shall be round and non-notched for use in Jacob chuck type hand and power drills. The drills shall conform to Defense Personnel Support Center (DPSC) Drawing 23378 for design and dimensions, for the applicable size number. The flutes of the drills shall be uniformly cut, shaped, and sharpened to cut at the tip as well as the sides of the operative end and provide automatic chip clearance. Size 1 (1.1 mm) drill shall be suitable for drilling holes for a 1.5 mm screw. Size 2 (1.5 mm) drill shall be suitable for drilling holes for a 1.5 mm cortex screw and thread holes for a 2.0 mm cortex screw. Size 3 (2.0 mm) drill shall be suitable for drilling gliding holes for a 2.0 mm cortex screw and thread holes for 2.7, 3.5 and 4.0 mm cortex screws. Size 4 (2.7 mm) drill shall be suitable for drilling gliding holes for a 2.7 mm cortex screw. Size 5 (3.5 mm) shall be suitable for drilling gliding holes for a 3.5 mm cortex screw.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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