Carmex Internal Right Hand UN Unified Thread Turning Insert 20 TPI / 16 IR 20 UN P25C HSS-E Countersink Cutter 90° 3/4" Weldon Shank 30mm Outside Diameter: 2-1/2"

Outside Diameter: 2-1/2"

Part Number: 13008

Philips 30-2171/2151

A torch maybe useful to examine the seat

Carmex Internal Right Hand UN Unified Thread Turning Insert 20 TPI / 16 IR 20 UN P25C HSS-E Countersink Cutter 90° 3/4" Weldon Shank 30mm Outside Diameter: 2-1/2"Internal Thread Turning Insert UN Full Profile 60 The UN Full Profile Internal Thread Turning Insert is engineered for precise internal threading of Unified thread forms (UNC, UNF, UNEF, UNS) with a 60 profile. Designed for a 20 TPI pitch, it forms the complete thread geometryincluding crest, root, and flanksin one pass, ensuring consistency and strength in every cut. Made from premium P25C grade carbide, this insert provides excellent wear