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1. high quality alloy tube, 2. thru-wall heat treated tube body, 3. consistent concentricity, straightness, 4. tapered threads - details see: https://www.machineto.com/heat-treated-wireline-drill-pipe-10317520

Raw materials:
Tangshan Jinshi only choose the best steel tubes in the market to manufacture our rods and pipes. Spot check will be conducted after the steel tubes delivered to company. We will make sure the compositions and specifications match the inspection report form the suppliers.

Heat treatment control:
Heat treatment will greatly improve the material strength and increase the thread wear life of the rods and casings. We conduct either tru-wall or both ends heat treatment to the tube body. After heat treatment, strength, hardness, straightness and concentricity of the treated tubes will be tested in our lab.

Thread opening process:
Accuracy of threads will determine the use effects and life time of drill rod and casings.
CNC latches and form cutter are used in thread opening processing to minimize error made by anthropic factors.

Additional thread treatment:
Surface of the threads will be cleaned to remove burr adhered after threads are opened.
Afterwards, the tread surface will be phosphated to improve surface conditions.

Drill rod specification:

Description	Length	OD	ID	Weight
Standard Q thread or RQ thread
Drill rod, B	1.5 m	55.6mm	46mm	9.4kg
	3m			18.6kg
Drill rod, N	1.5 m	71mm	60mm	13.5kg
	3m			23.7kg
Drill rod, H	1.5 m	89mm	77.8mm	17.93kg
	3m			35.84kg
Drill rod, P	1.5 m	114.3mm	101.6mm	26.79kg
	3m			52.56kg

Packed rods specification:

Bundle details	Number of rods	Length	Width	Height	Weight
Drill rod, B	104	1.55 m	0.63m	0.45m	752kg
		3.05m			1500kg
Drill rod, N	60	1.55 m	0.71m	0.43m	708kg
		3.05m			1420kg
Drill rod, H	40	1.55 m	0.73m	0.45m	690kg
		3.05m			1380kg
Drill rod, P	30	1.55 m	0.69m	0.58m	780kg
		3.05m			1557kg