Product Description
The 38 mm flat alloy drag bit is intended for construction and mining holes in soft material where a broad fixed edge can scrape the face without a rolling cone assembly. Its diameter equals 1.50 in. The compact profile suits straightforward pneumatic drilling when ground behavior remains predictable. Application context is available through the construction drilling archive, while the unconsolidated formation archive explains the loose alluvial and gravel class.
The filename identifies an alloy body and flat cutting geometry. The front edge should be checked for uniform carbide exposure, straightness, and gauge before use. A flat blade has no bearing or sealed cone, which simplifies inspection, but all cutting load remains on the fixed edge. The source does not name a thread or taper specification. Match the bit to the supported rod by measurement and connection marking rather than assuming compatibility from the 38 mm diameter alone. Check the back of the blade for wash or bending, since either condition can change the effective cutting angle before obvious edge loss appears.
Use low WOB and 100–250 RPM, watching torque for signs that the edge is buried or has entered a tougher band. Maintain enough circulation to move chips, but no numerical drag-bit flow range is supplied. This bit is not suitable for hard formation or a quartz-rich interval above the 20% abrasive threshold. Background on rock descriptions can be reviewed at the U.S. Geological Survey. If the edge chips or the hole stops responding within the allowed controls, change to a button system instead of increasing force.
