IIW Type 2 block
This is a modified version of the original IIW-Type 1 design.
Dimension:
12.0” x 4.0” x 1.0” (Metric Version also available)
Conforms to:
IIW, ASTM E164, US Air Force NDI Manual T.O, 22B-1-1 specifications. NSN is 6635-00-415-9225
Flaws:
Includes a 2.0” radius x .250” deep cut-out superposed on the 4.0” radius for distance calibration. Also includes numbers 3, 5 and 8 through holes (3/64”, 5/64” and 8/64” diameter) and distance calibration marks to the 2.0” hole.
