Big Kaiser TPGW-070203FN-MK10C Triangular Carbide Boring Insert
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The Big Kaiser TPGW-070203FN-MK10C (Order No. 651.632) is a new triangular (T = 60° included angle) carbide indexable insert in the TPGW ISO designation series: T = triangular shape, P = 11° clearance angle, G = ±0.025 mm / ±0.025 mm tolerance class, W = with hole and land (flat top geometry). Size code 0702 corresponds to a 4.2 mm inscribed circle diameter and 2.5 mm thickness; nose radius code 03 decodes to 0.3 mm; the FN chipbreaker geometry is a flat-top/neutral rake land suited for fine-to-medium boring operations. Grade MK10C is Big Kaiser's proprietary uncoated or lightly treated submicron carbide grade optimized for cast-iron (GG = Grauguss / gray cast iron) finish boring at the high surface speeds achievable in precision boring heads. The dark appearance visible in the photo is consistent with a surface treatment (e.g., steam oxide or fine-ground top face) rather than a thick CVD/PVD coating. These inserts are designed for use in Big Kaiser precision boring heads and cartridges that accept TPGW-type inserts, delivering the tight tolerances and fine surface finish required in bore finishing of gray cast iron workpieces.
Product Specifications
| Brand | Big Kaiser |
| MPN | TPGW-070203FN-MK10C |
| Order No. | 651.632 |
| ISO Shape Code | T — Triangular, 60° included angle |
| Clearance Angle | P — 11° |
| Tolerance Class | G — ±0.025 mm IC, ±0.025 mm thickness |
| Hole / Geometry Type | W — with hole and land (flat top) |
| Inscribed Circle (IC) | 4.2 mm |
| Insert Thickness | 2.5 mm |
| Nose Radius | 0.3 mm |
| Chipbreaker | FN (flat neutral rake land) |
| Grade | MK10C |
| Substrate | Submicron carbide |
| Application | GG (gray cast iron / Grauguss) |
| Condition | New |
| Qty per Package | 10 pcs (per visible insert tray) |