Canadian Mining Journal


DRILLING: Boart Longyear launches new XQ wireline coring rods

SALT LAKE CITY, Utah – Boart Longyear is launching new XQ wireline coring rods for use in drilling and coring applications in the mining industry. Well-known for first introducing the industry renowned Q rod, and then the RQ rod which took rod performance to a new level, Boart Longyear’s patented and innovative XQ rods add even more value as they are proven to be stronger, last longer and are easier to make and break.

Boart Longyear’s new XQ coring rods are reliable to a depth of 4,000 metres.

Already trialed at nearly 30 different exploration locations, with over 10,000 XQ rods tested, customers are excited about the benefits XQ rods bring to their drilling projects. As an example, a recent string of well-maintained XQ rods lasted nearly 20,000 meters of drilling, double the footage reached by RQ rods at the same site.

What makes XQ rods so revolutionary are the patented XQ thread joints. Featuring innovative self-aligning, double-start threads, the XQ rod’s joints engage smoothly virtually eliminate wedging or jamming – a common challenge with single thread rods – so make and break functions are much easier. Doubling the thread also means double the contact area for a balanced load response which translates to no box bulging. The thread design also includes a –20° reverse flank angle for even more strength and load capacity.

To minimize thread wear, Boart Longyear adds hardening to the crest of the pin thread to maximum hardness and create a significant hardness difference between pin and box. The hardness difference is proven to minimize wear and preserves the toughness in the joint required to carry drilling loads. Currently, no other manufacturer combines heat treated ends with pin case hardening.

Another distinct advantage is that XQ’s rod weight has been reduced by utilizing an exclusive new W-Wall tubing design. A thicker mid-body and rod ends provide a more uniform bend and outer wear distribution, reducing mid-body wear compared to other variable wall rods. W-Wall’s inner diameter gives more space to allow drilling fluid to pass by inner tube assemblies during wireline tripping. In fact, tests have shown wireline tripping to be up to 50% faster in XQ rods than in conventional parallel wall rods.

More information about Boart Longyear can be found at Readers can also follow the company on Twitter, LinkedIn and Facebook.

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