Boart Longyearís genuine QTM rods are the global standard for wireline coring. With over 40 years invested into our proprietary QTM wireline drill rod, Boart Longyear has met market demand through innovative engineering and state-of-the-art manufacturing techniques.
Tubing - High quality heat-treated alloy steel tubing offers consistent concentricity, straightness, and is available in all DCDMA sizes.
Thread - Proprietary tapered threads provide additional strength and ensure the easy make and break of rod joints. Load efficiency of 30% provides sufficient strength for average applications.
Thru-wall heat treatment - Our thru-wall heat treatment process provides 140% material strength and significantly increases thread wear life.
Case hardening - Boart Longyear is the only manufacturer in the industry to case-harden threads, which dramatically reduces galling and joint seizing.