The new Premium Plus design has refinements such as a tougher steel grade to resist fatigue. The buttons are repositioned to improve the penetration rate, and they are designed to protrude more, which aids in cuttings removal, less secondary crushing, and easier bit grinding. Finally, to reduce the risk of jamming in the hole, the taper on the bit head is shorter with a larger clearing. Shanking and chunking are practically eliminated, says Atlas Copco.
Premium Plus bits are now available for 5-inch hammers. Bits for 4-inch and 6-inch hammers will be available soon. They come in several configurations such as flat front HD, SpeedBit, convex front with ballistic buttons, concave front, and concave DGR.
Contact your local Atlas Copco Secoroc dealer or if you don't know who it is, visit www.atlascopco.com.
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