Combined-interlock Kelly bar is composed by interlock Kelly bar and full multi-interlock Kelly bar.

For this type of Kelly bar , the first section is 3-keys interlock type, inner few sections are multi-type step keys , the outer keys are three sections three set of concave and convex form .

Combined-interlock Kelly bar is based on domestic rig configuration and condition demand, combined with the home and abroad advanced manufacture technology, supporting domestic and foreign rotary piling rig.

This type Kelly bar have been applied for patent, the patent No. is 201420542676.9

No.	OD	Section			Way of crowding	Length of per section(m)	Drill depth	Torque
1	¢440	3	4	5	interlock-type	9 - 15	24 – 55	220-260
2	¢470(482)	3	4	5	interlock-type	9 - 15	24 – 70	230-280
3	¢508	3	4	5	interlock-type	9 – 15	24 – 70	260-360
4	¢530(540)	3	4	5	interlock-type	9 – 18	24 – 85	360-420
5	¢575(580)	3	4	5	interlock-type	9 – 18	24 – 85	420-460
6	¢630	3	4	5	interlock-type	9 – 20	24 – 92	460-550

OUR KELLY BAR ADVANTAGE :

1. Adopt the advanced technology design and standard modular design.

2. Equipped with advanced processing facilities, processing technology and auto manufacturing equipment .

3. The kelly bar is with low weight , high strength , good abrasion resistance.

4. The material is from China top pipe manufacturer or imported from Germany . the seamless steel tube is with alloy and special heat treatment .

5. Have granted more than 35 patents for the kelly bar design area.

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Beijing Jietaihongli Technology Co., Ltd., founded in 2004, headquartered in Beijing, branch factory in Shouguang, Shandong. The company is mainly engaged in the production and sales of rotary piling kelly bars , drilling tools, rotary piling rig overhaul, rig sales and accessories supply.

Beijing Jietai Haoli Technology Development Co., Ltd. is one comprehensive enterprise that produces and sells rotary drilling kelly bars ,drilling tools,piling rigs spares and piling rig maintenance.The company established in 2004. The founder has been engaged in after-sales service of drilling rigs and kelly bars such as IMT, SOIMEC, BAWER, and MAIT before the establishment of the company. During this period he accumulated rich experience in kelly bar manufacture and maintenance.The company focused on the research, development and production of kelly bars after establishment. The main kelly bars produced include frictional kelly bars ,interlocking kelly bars and square kelly bars.