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Drill Collar
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Introduction
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Heat Treatment of ZJSB drill collar adopts unique medium frequency inductance heating method for hardening and tempering,during which steel parts rotate continuously to get even heating.In the course of hardening,it adopts anular internal and external injection water cooling method to get even and high strength.Drilling collar material after whole length heat treatment could guarantee 285-341 Brinell hardness 1” below the surface of the pipe body.
ZJSB drill collar includes open faced,spiral groove,square,lopsided and pipe slips,elevator groove,wearing ring drill collar.The length of the drill collar could be 10 feet to 30 feet with 3-1/20’’ to 11” external diameter.Data information of common size refers to diagram.


Noted:
NNCTM thread is the know-how of ZJSB and its thread could exchange with APIN thread reduces stress concentration of thread tooth base more obviously than NC thread so as to make distribution of ridge loaded on each circle evenly.NNC could effectively improve sub fatigue life and reduce fatigue failure of drilling tool.


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If you have any problems or questions about our products or need our support and assistance, please write to us, we will reply to you within 24 hours, and we will use security measures for your information and never reveal your information to the third party. If you become our customer, you will get corresponding discount.
Inquiry
Please feel free to submit your inquiry information to us. We will contact with you as soon as possible.
* Your Name :
Your Country:
* Your Email:
Your Tel:
Your Company:
* Inquiry:
send message
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