Product Description
The R32, SR35, T38, and T45 ball-button family addresses top-hammer drilling across nominal thread series from about 32 to 45 mm, or 1.26 to 1.77 inches. It is relevant to mine headings, anchors, and civil rock holes where the rig fleet uses more than one connection class. Consult the construction drilling application archive and the abrasive formation archive before assigning a model. The family name does not make the four thread systems interchangeable.
The source confirms high-strength carbide and ball-button geometry but gives no bit diameter for a particular connection. This record therefore treats R32, SR35, T38, and T45 as connection-series identifiers, not as exact finished thread measurements or guaranteed hole gauges. The likely construction is a threaded alloy-steel body with fixed carbide contacts. Face type, gauge diameter, button count, skirt form, and flushing pattern must come from the selected model drawing. Thread labels alone cannot establish impact compatibility with a shank adapter or rod.
Operate within 1,000–3,000 lbf/in of actual bit diameter and 25–60 RPM after both connection and gauge are verified. Hard and abrasive formations fit the button mechanism, but higher quartz content increases gauge and face wear. Medium rock may permit lower loading while maintaining penetration. Document the selected gauge and connection together so maintenance records do not merge incompatible variants. Flow remains unspecified because the filename supplies neither bit diameter nor flushing geometry. The central limitation is missing diameter-to-thread mapping. Reference information on drilling systems can be found through the IADC. Archive the selected model drawing.
