A-A-51151C
3. SALIENT CHARACTERISTICS
3.1 General requirements.
3.1.1 Type I rotary files. The cutting heads of type I rotary files shall meet the minimum requirements for standard high-speed steel described in ASTM A 600, "Standard Specification for Tool Steel High Speed", when tested in accordance with ASTM A 370, "Standard Test Methods and Definitions for Mechanical Testing of Steel Products".
3.1.2 Type II rotary files. The cutting heads of type II rotary files shall be manufactured from tungsten carbide with a hardness of not less than 91.2 and not greater than 92.5 on the Rockwell "A" scale when tested in accordance with ASTM B 294, "Standard Test Method for Hardness Testing of Cemented Carbides". The cutting heads of type II rotary files shall have a density of
14.6 to 15.1 grams per cubic centimeter when tested in accordance with ASTM B 311, "Test Method for Density Determination for Powder Metallurgy (P/M) Materials Containing Less Than Two Percent Porosity". Type II rotary files shall have a transverse rupture strength of 220,000 pounds per square inch when tested in accordance with ASTM B 406, "Standard Test Method for Transverse Rupture Strength of Cemented Carbides".
3.2 Fluting. The fluting of the rotary files shall be either right-hand spiral, right-hand spiral with chip breaker, double cut, or diamond cut, depending upon the style specified.
3.2.1 Style A rotary files. Style A rotary files shall have right-hand spiral fluting consisting of a right-hand helix. The helix angle measured from the centerline of the cutter head shall be between
15 degrees and 35 degrees.
3.2.2 Style B rotary files. Style B rotary files shall have right-hand spiral fluting with a left-hand spiral chip breaker along the periphery of the cutting teeth.
3.2.3 Style C rotary files. Style C rotary files shall have double cut fluting consisting of a series of left-hand spirals in conjunction with right-hand spirals that results in a wedge or chisel form cutting tooth. The number of left-hand spirals shall be from 40 to 60 percent of the number of right-hand spirals.
3.2.4 Style D rotary files. Style D rotary files shall have diamond cut fluting consisting of a series of left-hand spirals in conjunction with right-hand spirals that result in a pyramidal form cutting tooth. The number of left-hand spirals shall be from 70 to 90 percent of the number of right-hand spirals.
4. REGULATORY REQUIREMENTS
4.1 Recovered materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR).
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