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Contact SupplierSet of nineteen flat-bottom hole blocks used to determine the relationship between metal travel distance (MTD)and signal amplitude. All blocks have the same size flat-bottom hole and varying MTD. Hole diameter must be specified when ordering (364�, 564� or 864�). In accordance with ASTM E428. Includes our NIST traceable dimensional certification report, ultrasonic inspection report and response plot from Tactic Inc, and the certified material test report. Note that we use a 5.0 MHz quartz transducer for block characterization as required by ASTM E127, Section 11.
� Dimensions: Metal travel distances are: .063�, .125�, .250�, .375�, .500�, .625�, .750�, .875�, 1.000�, 1.250�, 1.750�, 2.250�, 2.750�, 3.250�, 3.750�, 4.250�, 4.750�, 5.250� and 5.750�. Block diameter is 2.0".
� Made from 4340 Steel, Nickel-plated.