Specifications of t4 series boron carbide sandblasting nozzles: note that 1 pipe is always measured based on the outside diameter (od), and pipes less than 1 are measured on their inside diameter (id). thus a t5 nozzle is slightly smaller in size than a t4, but you cannot tell this visually as they are so close. Malyn industrial ceramics, inc. manufactures performance boron carbide nozzles and inserts for sandblasting, as well as other types of equipment. we offer custom boron carbide manufacturing capabilities as well as toll hot pressing and high temperature furnacing services. Boron carbide nozzles are the longest lasting nozzles commercially available & outlast tungsten carbide by 3-5 times! longer life = reduced down time. lightweight, reduces user fatigue. made in the usasupport american manufacturing! once you use boron carbide nozzles, you won't go back. China boron carbide nozzle (b4c insert) catalog of sandblasting boron carbide nozzle (b4c) for machinesu2032 cleaning/blasting, thread boron carbide venturi nozzles 1-1/4u2032u2032-11-1/2 (npsm) provided by china manufacturerkumthai abrasives co., ltd., page4.