Exploration / Rods and Casing
HD Coring Rods
THE DURABLE LARGE DIAMETER ROD
Launched in 1995, HD™ rods introduced thicker walled material and more robust tapered threads for a more durable large diameter product.
LASTS LONGER
Longer-lasting rods mean getting more meters per rod and replacing rods less often, directly adding value to the bottom line.
Pin Case Hardening: Other drill rods are typically hardened to 38 HRC. Boart Longyear coring rods are pin case hardened to maximum hardness – 60 HRC, creating a significant difference between pin and box and minimizing rapid galling that other threads experience.
Easier Make and Break
The tapered joint and coarse thread (2.5 threads per inch) reduces stress, resulting in easier and faster make and break for reduced wear and reduced labor costs. Threads are easier to clean due to wider spacing. Compatible with WT rod threads.
STRONGER
Using the same alloy with market-leading toughness as all Q series coring rods combined with Boart Longyear-designed larger, deeper threads (2.5 threads per inch), provides greater torsion and pullback strength to allow retrieval from difficult ground conditions and maximum durability.
LASTS LONGER
Longer-lasting rods mean getting more meters per rod and replacing rods less often, directly adding value to the bottom line.
Pin Case Hardening: Other drill rods are typically hardened to 38 HRC. Boart Longyear coring rods are pin case hardened to maximum hardness – 60 HRC, creating a significant difference between pin and box and minimizing rapid galling that other threads experience. In repeated “make and break” field testing, other non-case-hardened rods were shown to fail at between 12 and 100 cycles, whereas XQ joints withstood more than 600 cycles.
Boart Longyear’s W-Wall™ feature patent-pending, double-upset tubing, up to 30 percent lighter, thanks to its thin-walled mid-body. The lighter drill string increases the drill rig’s depth capacity and reduces fatigue during manual tripping. The enlarged inner diameter also increases wireline tripping speed by 50%, improving productivity. On an 800-meter hole, simply changing from a straight wall to a W-Wall rod can save 2 shifts or put 20% more core in the box
W-Wall coring rods with the standard wall thickness in the middle of the rod eliminate premature mid-body wear and resist bending, performing like straight-wall tubing.
