Product Description
This 40 mm X-type cross drag bit provides a 1.57 in fixed carbide profile for pneumatic holes in soft mining or construction ground. Four intersecting edges help center the start and distribute scraping contact around the face. The product is organized under Drag Bits because the required filename mapping assigns Cross structures to that category. See the construction drilling archive and the soft formation archive for the approved operating context.
The media name identifies an X-shaped carbide tip on an alloy-steel head. Inspect each arm for equal protrusion and look for cracks where carbide meets the supporting body. Unlike a tricone, the bit contains no cones, bearings, or IADC classification. The filename does not specify the shank or taper, so connection verification remains a separate purchasing and rig-up step. A correct 40 mm face can still be unusable if the rod interface is wrong. Before drilling, place the head on a flat reference and compare all four corners; uneven seating can reveal a bent body or mismatched carbide height that would otherwise be mistaken for formation-driven vibration.
Run the drag profile with low WOB and 100–250 RPM. A smooth torque response indicates that the fixed edges are cutting rather than bouncing. The bit has a clear limitation: it is not recommended for granite, basalt, quartzite, or other hard formation, and quartz above 20% can accelerate edge wear. The ScienceDirect rock-mechanics topic supplies general background. When hard inclusions cause repeated impact, replace the cross drag bit with an appropriate button design.
