Reverse Circulation Connection Adapters for RC Drilling

Rock Drilling Tools

Reverse Circulation Connection Adapters / Reverse Circulation Subs

Bit diameter range: 90-400mm
Thread connection: REMET, METZKE, API REG
Face design: center-drop face, concave face
Button types: domed button, semi-ballistic button, ballistic button, pointed button, flat button

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Key Advantages

Reverse circulation connection adapters are primarily used to connect the drilling rig to drill pipes, drill pipes to RC hammers, and to interface drill strings with different thread types. They play a critical role within the RC drilling system.
Designed with a dual-arm structure, fully compliant with the functional requirements of reverse circulation drilling systems, serving as a key linkage between all RC components.
Manufactured from high-quality low-carbon alloy steel and treated with optimized heat treatment processes, significantly enhancing overall strength and torsional resistance.

The adapter effectively distributes torsional loads across connected components, which is the fundamental reason transition subs are essential, even when identical thread types are used, particularly between the drilling rig and drill pipes, as well as between drill pipes and RC hammers.

Technical Specifications

Thread (pin)	Thread (box)	Diameter, mm	Length, mm	Inner tube to end, mm		Inner tube sealing face size, mm
Thread (pin)	Thread (box)	D	L	L1	L2	D1	D2
REMET 3.5''	REMET 4.0''	102	225	35	9	57.2	49.5
REMET 3.5''	METZKE 4.0''	102	225	25.4	9	54	49.5
METZKE 4.0''	REMET 4.0''	102	204	35	3.1	57.2	54
REMET 4.0''	METZKE 4.0''	102	204	25.4	7.5	54	57.2
METZKE 4.0''	METZKE 4.5''	114	188	48.2	3.1	57.2	54
METZKE 4.0''	REMET 4.5''	116	200	31.5	3.1	63.5	54
REMET 4.0''	METZKE 4.5''	114	208	48.2	7.5	57.2	57.2
REMET 4.0''	REMET 4.5''	116	220	31.5	7.5	63.5	57.2
METZKE 4.5''	REMET 4.5''	116	250	31.5	0	63.5	67.4
REMET 4.5''	METZKE 4.5''	116	220	48.2	6.5	57.2	63.5

Machined from premium 42CrMo alloy steel and processed with proven heat treatment technology, delivering significantly improved tensile strength and torque resistance.
Customization available, including length, thread types, as well as color and logo branding.

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Why are reverse circulation connection adapters required?

When adjacent components use different thread types, a reverse circulation adapter is essential to ensure full mechanical and internal passage continuity throughout the RC drilling system.

Is the quality of RC connection adapters critical?

Absolutely. Although the adapter functions as a connecting component, any quality failure can lead to severe drilling accidents. In deep RC drilling operations, adapter failure may result in the entire drill string being lost in the borehole, making recovery extremely difficult, time-consuming, and costly.