Locking coupling is a part of outer tube assembly. It connects the drill rod to the outer tube assembly. The locking coupling provides a mating surface which the head assembly latches ride against while drilling. Locking couplings stabilizes core barrel assembly against the drill hole wall.

Locking couplings are made of high-quality alloy steel with good strength, toughness and wear life.

Locking couplings overview:

Stabilized locking coupling features:

●Has wear pads with high density tungsten for improved wear life

●Can be used in all drilling conditions

●Also has with tang type which located on the pin end of the locking coupling

Full-hole locking coupling features:

●Oversized-pads for improved hole stabilization

●Pads induction-hardened for increased wear resistance

●For use in competent ground conditions

●Hard-faced latch resting area for increased latching reliability

●Also has with tang type which located on the pin end of the locking coupling 

Stabilized locking couplings offerings:

BQ Stabilized Locking Coupling

BRQ Stabilized Locking Coupling

BQ Stabilized Locking Coupling with Tang

BRQ Stabilized Locking Coupling with Tang

NQ Stabilized Locking Coupling

NRQ Stabilized Locking Coupling

NQ Stabilized Locking Coupling with Tang

NRQ Stabilized Locking Coupling with Tang

HQ Stabilized Locking Coupling

HRQ Stabilized Locking Coupling

HQ Stabilized Locking Coupling with Tang

HRQ Stabilized Locking Coupling with Tang

PQ Stabilized Locking Coupling

PQ Stabilized Locking Coupling with Tang

PHD Stabilized Locking Coupling

PHD Stabilized Locking Coupling with Tang

Full-hole locking coupling offerings:

BQ Full-hole Locking Coupling

BRQ Full-hole Locking Coupling

BQ Full-hole Locking Coupling with Tang

BRQ Full-hole Locking Coupling with Tang

NQ Full-hole Locking Coupling

NRQ Full-hole Locking Coupling

NQ Full-hole Locking Coupling with Tang

NRQ Full-hole Locking Coupling with Tang

HQ Full-hole Locking Coupling

HRQ Full-hole Locking Coupling

HQ Full-hole Locking Coupling with Tang

HRQ Full-hole Locking Coupling with Tang

PQ Full-hole Locking Coupling

PQ Full-hole Locking Coupling with Tang

PHD Full-hole Locking Coupling

PHD Full-hole Locking Coupling with Tang