Rock Drilling Tools

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Website: http://rockdrilltool-en.com/dth-connection-adapters-1-1-4.html

Complete thread range covers all major API-standard threads, including REG and NC series, ensuring broad compatibility with common drilling tools.
High-strength material and heat treatment: Manufactured from 42CrMo alloy steel and processed with a proven heat treatment process, delivering high tensile strength, excellent toughness, and superior torque resistance.
Comprehensive customization support:
1. Technical customization: length, thread type, and connection form
2. Appearance customization: surface color and logo marking

Typical Applications

Open-pit mining, agricultural irrigation wells, bridge and building construction, geological exploration, oil and gas drilling

Open-pit blasting and mining

Water well drilling

Technical Specifications

Thread (pin)	Thread (box)	Diameter	Length	Falt Size	Flat Width	Hammer Type
Thread (pin)	Thread (box)	D, mm	L0, mm	L1	K	Hammer Type
API 2 3/8'' REG	API 3 1/2'' REG	114	235	95	45	4'' or 5''
	NC26	89	262	70	45
	NC31	102	240	83	40
API 3 1/2'' REG	API 2 3/8'' REG	108	410	95	51	6''
	NC26	118	400	72	45
	NC31	114	300	95	51
	NC38	127	400	108	51
API 4 1/2'' REG	API 2 3/8'' REG	138	460	57	40	8''
	API 3 1/2'' REG	138	480	83	51
	NC26	138	440	70	45
	NC31	138	440	95	51
	NC38	138	420	108	51
API 5 1/2'' REG	API 4 1/2'' REG	178	312	150	80	10''
	NC31	168	460	95	51
	NC38	168	480	108	51
API 6 5/8'' REG	API 4 1/2'' REG	270	400	220	70	12''
	API 5 1/2'' REG	190	330	164	60
	NC35	178	467	95	51
	NC38	194	550	98	55
	NC46	178	350	161	55
	NC50	200	350	180	80
API 7 5/8'' REG	API 4 1/2'' REG	198	390	124	51	14''
	NC31	198	380	95	51
	NC50	246	550	127	50
API 8 5/5'' REG	API 6 5/8'' REG	Custom	Custom	Custom	Custom	18'' or 24''
	NC46	Custom	Custom
	NC50	Custom	Custom	Custom	Custom

The above specifications list Pin x Box thread connections. Other configurations are available, including Pin x Pin, Box x Box, and Box x Pin, subject to customization.

Are adapters available for connecting drilling rigs to drill pipes?

Yes. Adapters can be customized once the thread specifications of both the drilling rig and the drill pipes are provided.

How is the quality and durability of the adapters ensured?

Adapters are manufactured from high-quality 42CrMo alloy steel and processed using a proven heat treatment process. This ensures high strength, reliability, and a long service life under demanding drilling conditions.

How can end-of-life or failure of an adapter be identified?

Typical indicators include:

A significant reduction in outer diameter due to wear
Threads worn nearly smooth, indicating a loss of effective connection strength