Machinists, this one's for you. This is an HHIP TPGH-321 triangle carbide insert. Here are the specs you need to know: It's a 3/8 inch (9.525mm) inscribed circle (I.C.) triangle insert. It uses a screw-on clamping style (not a pin-lock) and features a chipbreaker geometry to help control chips during cutting. The grade is C5, which is formulated for heavy roughing to semi-finishing operations on all types of steel. It has an 11-degree relief angle. The thickness is 1/8 inch (3.175mm), and it has a 1/64 inch (approx. 0.4mm) corner radius. Its ISO standard designation is TPGH160304. If you're running jobs that need to remove a lot of material from steel workpieces and you use tools that accept this style of triangle insert, this is a reliable, budget-friendly option to keep your shop running. Always confirm the insert geometry and grade are suitable for your specific machine, holder, and material.
