HD threads are designed for reliability in large size core drilling, the HD drill rod offers a robust, coarse thread profile for heavy duty wireline applications.
FEATURES
TUBING
High quality alloy steel tubing
Consistent concentricity, straightness and heat treatment
Parallel wall tubing in standard DCDMA sizes
THREAD DESIGN
Larger deeper threads (2.5 threads per inch) provide maximum durability
Load efficiency of 40% provides sufficient strength for large hole sizes
CASE HARDENING
Boart Longyear is the only manufacturer in the industry to case-harden threads
Significant research, development and field testing has resulted in a hardening process that is unmatched in the marketplace
Pin thread crest is hardened to nominal 55 HRc to eliminate damaging ‘adhesion’ wear
Eliminates the transfer of wear material back and forth which is what happens between threads of equal hardness, leading to large scale galling and joint seizing
