Helical Back Rake Boring Bars
Back rake geometry reduces cutting pressure for improved stability
Helical grind helps promote consistent chip evacuation
Supports better surface finish and reduced chatter in challenging bores
Optional AlTiN+ coating provides better surface finish
Helical Back Rake Boring Bars are engineered to lower cutting forces and improve chip flow for smoother boring and more stable finishes.
| A (Minimum Bore) | S (Shank Diameter) | OAL | Tool # | Uncoated EDP # | AlTiN+ EDP # |
|---|---|---|---|---|---|
| 0.130 | 0.1093 | 1.50 | HB135 | 215736 | 215832 |
| 0.145 | 0.1250 | 1.50 | HB150 | 215739 | 215835 |
| 0.145 | 0.1250 | 2.50 | HB150L | 215742 | 215838 |
| 0.174 | 0.1562 | 1.50 | HB180 | 215745 | 215841 |
| 0.174 | 0.1562 | 2.00 | HB180L | 215751 | 215847 |
| 0.174 | 0.1562 | 3.00 | HB180EL | 215748 | 215844 |
| 0.205 | 0.1875 | 1.50 | HB210 | 215754 | 215850 |
| 0.205 | 0.1875 | 3.00 | HB210L | 215757 | 215853 |
| 0.235 | 0.2187 | 1.50 | HB240 | 215760 | 215856 |
| 0.235 | 0.2187 | 3.00 | HB240L | 215763 | 215859 |
| 0.284 | 0.2500 | 2.50 | HB300 | 215766 | 215862 |
| 0.284 | 0.2500 | 3.50 | HB300L | 215769 | 215865 |
| 0.345 | 0.3125 | 3.00 | HB360 | 215772 | 215868 |
| 0.345 | 0.3125 | 5.00 | HB360L | 215775 | 215871 |
| 0.470 | 0.4375 | 3.00 | HB480 | 215778 | 215874 |
| 0.470 | 0.4375 | 6.00 | HB480L | 215781 | 215877 |
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