NAVY EDDY CURRENT REFERENCE STANDARD KIT
Manufactured in accordance with U.S.A.F. T.O. 33B-1-1 Figure 4-50
P/N NRK-3A: Aluminum 7075-T651 Top and middle layers, 7075-T73 bottom layer.
P/N NRK-3S: 4340 Steel all three layers.
P/N NRK-3T: 6AL-4V TI all three layers.
P/N NRK-3AST Consists of all three of the above.
The standard is a 3 plate assembly measuring 4" x 7" x .875". Contains 20 fastener holes, with diameters ranging from .156" to .750"., 2 screw holes, and 2 dowel holes. There are 71 E.D.M. notches in various locations. Notch depths and lengths vary. Widths for all notches is .004"