ASME Basic Calibration Block is used for establishment of primary reference responses for UT examination of welds. ASME Basic Calibration Block 1 contains three side-drilled holes at 38mm deep minimum at 2.5mm diameter. the hole locations through the thickness are 1/4, 1/2 and 3/4 T. it also contains 2 EDM notches measuring 2% T deep * 6.4mm max wide * 25 long min. In accordance with ASME Sec V T-434.2.1

Weld Thickness(mm)	Block Dimension(mm) Thick*Wide*Long	NetWeight	GrossWeight	Packing
Up to 25	19*150*150	3.5	4.5
Over 25 through 50	38*150*200	9	10
Over 50 through 100	75*150*250	23	24
Over 100	125*150*381	58	62

All standard blocks can be customized per request!