Threading Holders for Oil Pipe Ordering Code System Threading Holders for Oil Pipe Ordering Code System Conventional Tooholders Code System Multi - Clamping Tooholders Code System HT N F A F HT N M S 15 B F 48 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 Holder Type Direction of clamping Pipe Size Shank Style Height of shank Insert height of shank A series Holder Clamping Method Insert Shape Length of Insert Height of Insert height A series of code Pipe Size Shank Style of code Type of Insert Cutting Edge shank of shank A series of code Holder Type Direction of Clamping A series of code Holder Type Clamping Method of Insert HT N F HT N M HT series : applicable to RB series inserts PP series : applicable to BB series inserts M: Top and hole , clamping Z 1 series : applicable to RT17 series inserts W: External F: Reversed Clamping HT series : applicable to RB series inserts W : External (Multi clamp , pin and clamp ) Z 3 series : applicable to RT12 series inserts TR series : applicable to RT series inserts N: Internal None: Front Clamping PP series: applicable to BB series inserts N : Internal P : Hole clamping ( Pin lock ) LP series : applicable to VBT series inserts S : Screw on CT series : applicable to RL series inserts Application Range Shanak Style Height of Shank Insert Shape Length of Insert Cutting Edge Application Range A F 48 S 15 B F: Squre Shank The height of square shank ABC D Y: Round Shank The diameter of round shank . C D.V S ABCD I I Insert height of Shank V T 32 Shanak Style Height of Shank Insert height of Shank The insert height of square shank F The length of round shank 48 32 F: Squre Shank The height of square shank The insert height of square shank Y: Round Shank The diameter of round shank The length of round shank