DC Calibration Test Block (Inch Version) The DC AWS Block is a metal path distance and beam exit point calibration standard that conforms to the requirements of the American Welding Society (AWS) and the American Association of State Highway and Transportation Officials (AASHTO). Instructions on using the DC block can be found in the annex of American Society for Testing and Materials Standard E164, Standard Practice for Ultrasonic Contact Examination of Weldments. AWS-type DC block used for shear wave distance calibration. Contains a 1.0" radius overlaying a 2.0" radius on a 180� segment. In accordance with ASTM E164 and BRR/AWS X-1 specifications. Dimensions: 2.000" and 1.000" Radii

DC Calibration Block (Metric Version) The DC AWS Block is a metal path distance and beam exit point calibration standard that conforms to the requirements of the American Welding Society (AWS) and the American Association of State Highway and Transportation Officials (AASHTO). Instructions on using the DC block can be found in the annex of American Society for Testing and Materials Standard E164, Standard Practice for Ultrasonic Contact Examination of Weldments. AWS-type DC block used for shear wave distance calibration. Contains a 25.0 mm radius overlaying a 50.0 mm radius on a 180� segment. In accordance with ASTM E164 and BRR/AWS X-1 specifications. Dimensions: 25.0 mm radius is 12.5 mm thick and 50.0 mm radius is 25.0 mm thick.