Hertel TPGH-321A HC620B .375" IC Carbide Boring Insert (10 pcs)
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The Hertel TPGH-321A HC620B is a new, USA-made triangular carbide boring insert with a 0.375 in (3/8 in) inscribed circle, designed for precision internal boring operations on CNC and manual lathes. Decoding the designation: T = triangular (60° included angle), P = 11° clearance angle, G = close tolerance (±0.001 in IC / ±0.0005 in thickness), H = with hole and single-sided chipbreaker, 3 = 3/8 in IC, 2 = 3/16 in thickness (approx. 4.76 mm), 1 = 1/64 in (0.016 in) nose radius, A = chipbreaker style. The HC620B grade is a CVD TiN/TiCN/Al₂O₃ multi-layer coated carbide (the visible gold color confirms TiN outer coating), suited for medium to finishing cuts on steel, stainless steel, and cast iron at moderate to high cutting speeds. This box of 10 inserts (Hertel catalog #7604781001) is made in the USA and fits TPGH-style boring bar toolholders with 3/8 in IC seating pockets, making them compatible with common mini and standard boring bars accepting TPGH-type inserts.
Product Specifications
| Brand | Hertel |
| MPN | TPGH-321A |
| Catalog Number | 7604781001 |
| Grade | HC620B |
| Insert Shape | Triangular (T), 60° included angle |
| Clearance Angle | 11° (P) |
| Tolerance Class | G (±0.001 in IC, ±0.0005 in thickness) |
| Inscribed Circle (IC) | 0.375 in (3/8 in) |
| Thickness | 3/16 in (approx. 4.76 mm) |
| Nose Radius | 1/64 in (0.016 in) |
| Coating | CVD TiN/TiCN/Al₂O₃ multi-layer (gold outer) |
| Application | Internal boring |
| Cutting Edge | Single-sided w/ chipbreaker |
| Country of Origin | USA |
| Quantity per Package | 10 |
| Compatible Toolholder Style | TPGH 3/8 in IC boring bar holders |