Nera Petroleum Mechanical Manufacture Co., Ltd.
 Agriculture > Agricultural & Gardening Tools >  Non-magnetic Drill Collar

Non-magnetic Drill Collar

Brand Name:
Drill Collar
Machine Type:
Drilling Tool
Carbon Steel
Processing Type:
Non-magnetic Drill Collar
Detailed Description

Non-magnetic drill collar is according to API
1.Material:low-carbon high chrome-manganese alloy steel
2.Size: from 31/8"~11"

Non-magnetic drill collar


Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity.

1. Material introduction

  • Materials of the Non-magnetic drill collar are from chrome manganese, low carbon obtained by combining a proprietary chemical analysis and a rotary hammer process.
  • The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling.

 2. Properties introduction

  • When the magnetic intensity is 1*105/4 πA/m, the relative permeability of the non-magnetic drill collar is μr<1.010. 
  • Magnetic induction intensity of the non-magnetic drill within any 100mm space between the internal holes of non-magnetic drill collar<0.05μT.

 3. Standard: API Spec. 7


4. Size:from31/8" to 11"


5. Main parameters

Mechanical Property


Yield strength Rt

Tensile strength Rm

Elongation 4(%)





3 1/8--6 3/4











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Company information:
    Nera Petroleum Mechanical Manufacture Co., Ltd. established sine 2007 . We is an exporter of China (Mainland) Other Agricultural & Gardening Tools products.    We have exported products to many other countries, such as North America South America Eastern Europe Southeast Asia Africa Oceania Mid East Eastern Asia Western Europe. Our main business goal is to provide top quality products for our customers    We take this opportunity to invite you to become our partner!Please visit our website at for detailed information on our organization.
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Nera Petroleum Mechanical Manufacture Co., Ltd.
Ms. Anna Guo
No. 2 Juzhou Road, Dongying Developing Zone

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