Used for establishment of primary reference responses for UT examination of welds.

Block contains three side-drilled holes at 1.5 deep minimum at 3/32 diameter. Hole locations through the thickness are ¼, ½, and ¾T. Also contains two EDM notches measuring 2%T deep x 1/4 max wide x 1.0 long min. In accordance with ASME Sec V Art. 4 Fig. T-434.2.1.
This version has been extended an additional 1″ on both sides which provides additional separation between the corner trap and SDH signals.

Block Dimensions: .75″ x 8.25″ x 6″