MILITARY GRADE NOS 116236211 MS39125-5 STEEL ROCK DRILL BIT NSN 3820-00-641-7643 [7288E+]
DRILLED HOLE DIAMETER 1.625 INCHES
ATTACHMENT METHOD THREADED BOTTOM DRIVE
CLEANING HOLE LOCATION AND QUANTITY 1 CENTER AND 4 SIDE
CUTTING END TYPE CROSS
FEATURES PROVIDED TUNGSTEN CARBIDE INSERTS
MANUFACTURER THREAD DESIGN DESIGNATION MIL STD 90496
MATERIAL STEEL.
A detachable, end cutting drilling tool with an internal thread or tapered socket at one end for attaching a rock drill rod. The opposite end is designed with two or more cutting edges for drilling into rock formation by impact and a slight rotary motion. It contains a hole or holes in the cutting for the purpose of conducting air or water to clear the hole being drilled. It is used with powered drifter drills, sinker drills, and the like.
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