Spiral Drill Collars
- Estimate pricingPrice on request
- Material4145H MOD modified chromium-molybdenum alloy steel
- StandardAPI Spec 7-1
- Thread treatmentPhosphated, copperized, or cold worked
- Thread machiningCNC lathes, double-shouldered and special thread
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Products Description
The spiral drill collars are made of 4145HMOD modified chromium-molybdenum alloy steel according to API Spec 7-1 . All threads can be phosphated,copperised or cold worked. All threads are machined with CNC Lathes-Double-Shouldered and a special thread, the max diameter of spiral drill collar is 14 inch. Out diamete: 3 7/8"~ 14"(inch) Depth of cut: 4.0 ~ 11.9 (mm) Length: 9150+150(mm) Standard size�?� for�?� drill collar Connection # OD ID L mm DF mm Bending strength ratio mm in mm In NC23-31 79.4 3 1/8 31.8 1 1/4 9150 76.2 2.57:1 NC26-35 88.9 3 1/2 38.1 1 1/2 9150 82.9 2.42:1 NC31-41 104.8 4 1/8 50.8 2 9150 or 9450 100.4 2.43:1 NC35-47 120.7 4 3/4 50.8 2 9150 or 9450 114.7 2.58:1 NC38-50 127.0 5 57.2 2 1/4 9150 or 9450 121.0 2.38:1 NC44-60 152.4 6 57.2 2 1/4 9150 or 9450 144.5 2.49:1 NC44-60 152.4 6 71.4 2 13/16 9150 or 9450 144.5 2.84:1 NC44-62 158.8 6 1/4 57.2 2 1/4 9150 or 9450 149.2 2.91:1 NC46-62 158.8 6 1/4 71.4 2 13/16 9150 or 9450 150.0 2.63:1 NC46-65 165.1 6 1/2 57.2 2 1/4 9150 or 9450 154.8 2.76:1 NC46-65 165.1 6 1/2 71.4 2 13/16 9150 or 9450 154.8 3.05:1 NC46-47 171.4 6 3/4 57.2 2 1/4 9150 or 9450 159.5 3.18:1 NC50-67 171.4 6 3/4 71.4 2 13/16 9150 or 9450 159.5 2.37:1 NC50-70 177.8 7 57.2 2 1/4 9150 or 9450 164.7 2.54:1 NC50-70 177.8 7 71.4 2 13/16 9150 or 9450 164.7 2.73:1 NC50-72 184.2 7 1/4 71.4 2 13/16 9150 or 9450 169.5 3.12:1 NC56-77 196.8 7 3/4 71.4 2 13/16 9150 or 9450 185.3 2.70:1 NC56-80 203.2 8 71.4 2 13/16 9150 or 9450 190.1 3.02:1 6 5/8 REG 209.6 8 1/4 71.4 2 13/16 9150 or 9450 195.7 2.93:1 NC61-90 228.6 9 71.4 2 13/16 9150 or 9450 212.7 3.17:1 7 5/8 REG 241.3 9 1/2 76.2 3 9150 or 9450 223.8 2.81:1 NC70-97 247.6 9 3/4 76.2 3 9150 or 9450 232.6 2.57:1 NC70-100 254.0 10 76.2 3 9150 or 9450 237.3 2.81:1 8 5/8REG 279.4 11 76.2 3 9150 or 9450 266.7 2.84:1 8 5/8REG 355.6 14 76.2 3 9150 or 9450 266.7 2.84:1
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Products Specification
- Material4145H MOD modified chromium-molybdenum alloy steel
- StandardAPI Spec 7-1
- Thread treatmentPhosphated, copperized, or cold worked
- Thread machiningCNC lathes, double-shouldered and special thread
- Maximum outer diameter14 in
- Outer diameter range3 7/8 in - 14 in
- Depth of cut range4.0 - 11.9 mm
- Length9150 ± 150 mm
- Connection typesNC and REG series (various sizes)
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The Spiral Drill Collars are made of 4145H MOD modified chromium-molybdenum alloy steel according to API Spec 7-1. Threads can be phosphated, copperized, or cold worked, and are machined with CNC lathes using double-shouldered and special thread profiles. The maximum outer diameter is 14 inches. The seller provides a table of standard sizes covering outer diameters from 3 7/8 inches to 14 inches, depths of cut from 4.0 to 11.9 mm, and a length of 9150 ± 150 mm, with various connection types including NC and REG series.
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About Supplier
Metalwork Petroleum Technology Co, Ltd. is a B2B supplier based in China, listed on Global Trade Plaza since October 2026. Use Inquire now or Chat with supplier to ask Metalwork Petroleum Technology Co, Ltd. for prices, specifications and documents for Spiral Drill Collars.
Supplier Details for Spiral Drill Collars
- Member since - Oct 2026
- Business Type - Contact Seller
- Deals in Product Type - Drilling Machines & Tools
- Country - China
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Metalwork Petroleum Technology Co, Ltd., a B2B supplier from China, dispatches Spiral Drill Collars primarily through the port at China. Packaging types (e.g., bulk, custom, eco-friendly) and estimated pricing may vary based on order volume and destination. To get detailed logistics and pricing information, use Get a quote or Chat with supplier, or Sign Up for direct supplier interaction.
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