| Customization: | Available |
|---|---|
| Customized: | Customized |
| Standard: | API, SGS |
|
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|
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Our precision couplings material used is milled as domestic seamless, manufactured to the highest standards of API. We ensure all testing and material certifications are conforming to industry standards and customer defined requirements and control of specialty processes:
Mechanical Test Including Tensile Strength
Impact Test
Chemical Properties Control
Size Tolerances, Od, Wall Thickness, Length and Straightness
Threads Control, Threads Quantity Per Inch, Threads Angle
Heat Treating
Material Certification
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IADC
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Pressure(KN/mm)
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Drill speed(r/min)
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Applicable strata
|
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417/427
|
0.3-0.9
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150-70
|
Very soft strata have low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone,
etc. |
|
437/447
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0.35-0.9
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150-70
|
|
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515/525
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0.35-0.9
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180-60
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Soft strata have low compressive strengthand high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc.
|
|
517/527
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0.35-1.0
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140-50
|
|
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535/545
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0.35-1.0
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150-60
|
Soft to medium-soft has low compressive strength, such as medium-soft shale, medium-soft limestone, medium-soft sandstone, forming
medium-hard and hard grinding interlayer. |
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537/547
|
0.4-1.0
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120-40
|
|
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617/627
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0.45-1.1
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90-50
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High compressive medium-hard formation strength, such as hard shale, limestone, sandstone, dolomite, etc.
|
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637
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0.5-1.2
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80-40
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Hard strata have high compressive strength, such as sandstone, limestone, dolomite, gypsum, marble, etc.
|
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737
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0.7-1.2
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70-40
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Hard strata have high compressive strength, such as hard limestone, dolomite, etc.
|
|
827/837
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0.7-1.2
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70-40
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Extremely hard strata with high compressive strength and abrasiveness, such as hard limestone, dolomite, hard sandstone, chert,
etc. |
1. who are we?
We are based in Hebei, China, start from 2011,sell to Domestic Market(50.00%),Southeast Asia(10.00%),North America(9.00%),Africa(9.00%),Western Europe(5.00%),Mid East(5.00%),Eastern Europe(3.00%),South America(2.00%),Oceania(2.00%),South Asia(1.00%),Eastern Asia(1.00%),Southern Europe(1.00%),Central America(1.00%),Northern Europe(1.00%). There are total about 101-200 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Friction Bolt, Solid Deformed Bar, Resin Capsule, Welded Wire Mesh Sheet, Domed Plate
4. why should you buy from us not from other suppliers?
Handan Zhongfu Industrial and Mining Accessories Co., Ltd. was established in 2011, located in Hebei-Yongnian, China's fastener industry base. It has built its own modern large-scale industrial and mining supporting material production workshop, anchoring
5. what services can we provide?
Accepted Delivery Terms: FOB;
Accepted Payment Currency:USD;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese
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