A-A-51152A
2.4 Class. See 7.3(e)).
Class A - Coarse tooth spacing Class B - Medium tooth spacing Class C - Fine tooth spacing
3. SALIENT CHARACTERISTICS
3.1 Design. Type I and II rotary files shall be either one- or two-piece construction. When two- piece construction is used, the files shall have a steel shank securely joined to the cutting head in a manner that conforms to the manufacturer's standard commercial practice.
3.2 Materials and hardness.
3.2.1 Type I. The cutting heads of type I rotary files shall be manufactured from high speed tool steel in accordance with ASTM International A 600, "Standard Specification for Tool Steel High Speed". The cutting heads shall be hardened and tempered to a hardness of not less than 62 and not greater than 65 on the Rockwell C scale. Type I rotary files of two-piece construction shall have shanks of a hardness conforming to the manufacturer's standard part drawing for the rotary file specified in the acquisition order.
3.2.2 Type II. The cutting heads of type II rotary files shall be manufactured from C-2 commercial grade tungsten carbide. The cutting heads shall have a hardness of not less than 91.5 and not greater than 92.5 on the Rockwell A scale. Type II rotary files of two-piece construction shall have shanks hardened and tempered to a hardness of not less than 30 and not greater than
55 on the Rockwell C scale.
3.3 Head and shank concentricity. The head and shank shall be concentric to within 0.005 inch total indicator reading (TIR).
3.4 Tolerances. The allowable shank diameter tolerance shall be +0.000, -0.002 inch. The shank length shall conform to the manufacturer's standard part drawing for the rotary file specified in the acquisition order. The allowable tolerance for cutter head diameters shall be not greater than ±0.010 inch. The allowable tolerance for the cutter head length shall be not greater than ±0.062 inch.
3.5 Teeth per circumference. The number of cutting teeth on the circumference of the rotary file shall conform to table III or IV for the type rotary file and class tooth spacing required. The
tooth count per circumference shall be the number of right hand spirals on the circumference of the rotary file. Where ranges are shown in tables III and IV for a particular diameter rotary file, the required number of teeth shall be not less than the lower number shown and not greater than the larger number shown.
3
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business