Product Description
The T38/R38 heat-inserted multi-button bit is intended for mine headings, quarry holes, and civil rock drilling with a nominal 38 mm thread class, approximately 1.50 inches. T38 and R38 describe different thread profiles even though their nominal number is the same. Place the job within the construction drilling application archive and assess wear through the abrasive formation archive. The record represents separate connection options and does not imply that one bit fits both rods.
The source states threaded construction, heat-inserted ball teeth, a multi-button carbide-steel face, and T38-R38 references. This supports a threaded alloy-steel body with fixed carbide inserts installed by the stated process. The filename does not identify the finished hole gauge, button count, face profile, skirt form, or flushing ports. Heat insertion is not converted into a retention or life guarantee. Confirm whether the selected model is T38 or R38, then verify gauge, shoulder, face geometry, and impact compatibility from a drawing.
Use 1,000–3,000 lbf/in of actual bit diameter and 25–60 RPM after the missing gauge is established. Hard and abrasive rock are suitable, but thread heating, insert movement, or uneven gauge wear calls for inspection. Because the hole gauge is absent, no total load should be calculated until the exact model is measured and documented. Flow is blank because the source provides no bit diameter, rod bore, or port data. The explicit limitation is that nominal thread class cannot substitute for hole-gauge information. General rock-mechanics background is available from the ScienceDirect engineering topics.