Female-to-female coupling adapters from Crowder Supply join two male-threaded drill string components including across different thread systems with left-side options from R25 to H55 and right-side options from R28 to T76, plus TTN and X series threads. Machined from 4140 or 8620 heat-treated alloy steel, they meet or exceed OEM specifications for rock drills from Atlas Copco, Epiroc, Sandvik, Furukawa, TEI and more.
Cross-thread couplings solve the mixed-string problem: a T38 drifter running R32 extension rods, or legacy steel meeting a new adapter standard. Pick the left and right threads to match each side of the joint and where the string starts at the drill, drill steel adaptors handle the shank end. The drill steel adapters buyers guide maps which piece goes where. Crowder Supply stocks a large variety of sizes and threads.
- Left-side threads: R25, R28, R32, R38, R51, T38, T45, T51, T76, TTN30, TTN40, TTN52, X32, X38, X51 and H55
- Right-side threads: R28 through T76 including T38SQ, TTN and X series
- Cross-system combinations join mismatched strings (e.g., R32 to T38)
- Machined from 4140 or 8620 heat-treated alloy steel
- Meets or exceeds OEM specs; fits Atlas Copco, Epiroc, Sandvik, Furukawa and TEI drill strings
- Large variety of sizes and threads stocked by Crowder Supply in Denver
