
(1) ISO Code (2) Additional Information (ISO Standard Classification) Chart 1 B2/B3 Chart 1 (2) Additional Information Symbol Old symbol Code Description (–)B (‒)B Full-top CBN insert Full-top CBN insert –BSTN –BSN (Small edge treatment)
(1) (2) (3) (4)
(1) No. of Cutting Edges (2) Type Code (3) ISO Code (4) Additional Information
Chart 2 Chart 3 (ISO Standard Classification) B2/B3 Chart 4
Chart 2 (1) No. of Cutting Edges Chart 4 (4) Additional Information L26
| New | Old | Code De | scription |
| symbol | symbol | SUMIBORON | Coated SUMIBORON |
| (No Code) | (No Code) | Standa | rd Type |
| LF LE | F | Sharp Edge Type | Sharp Edge Type |
| LT | S | Small Edge Treatment Type | Small Edge Treatment Type |
| LS | M | General Type for Continuous Cutting | Fine Boring Type |
| ES | - | - | High Efficiency Type |
| HT HS | T | Strong Edge Type | Strong Edge Type |
| WG WH W | W | Wiper | Insert |
| N-FV N-LV N-SV | N-SV | Chipbrea | ker Type |
6 6 cutting edges
| Code | Series | Grade |
| NC | Coated SUMIBORON | BNC2010,2020, BNC100,160, BNC200, 300, 500 |
| NU NS | SUMIBORON | BNX10, 20 BN1000, 2000, 350 BN500,700,7000,7500 BNX25 |