NS-1 Specification Drill Collar & Non-Magnetic Drill Collar
Product Description
Professional supplier of slick drill collars, spiral drill collars, and non-magnetic drill collars. Sizes range from 3-1/8 to 11 inches. Custom specifications are available upon request to meet specific drilling requirements.
Technical Specifications & Features
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High-Quality Materials
Manufactured from AISI 4145H modified steel and P550/P530 non-magnetic alloys. Supplied in "as rolled" surface finish or alternative custom finishes.
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Precision Heat Treatment
Trepanned and drifted to API Spec 7-1. Full-length heat treatment ensures mechanical properties exceed standards, with guaranteed Brinell hardness (285-341) and Charpy "V" notch impact strength.
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Full Traceability
Material and process traceability are strictly maintained from raw material receipt to final assembly. Serial numbers are die-stamped on bar bodies for permanent identification.
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Rigid Inspection Procedures
Compliance with API SPEC 7-1 is ensured through visual dimensional checks and comprehensive ultrasonic inspections over the entire body of the drill collar.
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Advanced Surface Processing
Cold-rolled thread roots and elevator recess upper radii increase fatigue life by creating compressive stress conditions. All connections are phosphate-coated or copper-plated to maximize corrosion resistance.
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Efficient Handling
Optional slip and elevator recesses are machined in compliance with API spec 7-1 guidelines to improve rig floor handling efficiency and safety.
| Nominal Size |
D |
d |
L (mm) |
DF (mm) |
Bending Strength Ratio |
| mm |
in |
mm |
in |
| NC31-41(2-7/8IF) | 104.8 | 4-1/8 | 50.8 | 2 | 9150 | 100.4 | 2.43:1 |
| NC35-47 | 120.7 | 4-3/4 | 50.8 | 2 | 9150 | 114.7 | 2.58:1 |
| NC38-50(3-1/2IF) | 127.0 | 5 | 57.2 | 2-1/4 | 9150 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 2-1/4 | 9150/9450 | 144.5 | 2.49:1 |
| NC44-60 | 152.4 | 6 | 71.4 | 2-13/16 | 9150/9450 | 144.5 | 2.84:1 |
| NC44-62 | 158.8 | 6-1/4 | 57.2 | 2-1/4 | 9150/9450 | 149.2 | 2.91:1 |
| NC46-62(4IF) | 158.8 | 6-1/4 | 71.4 | 2-13/16 | 9150/9450 | 150.0 | 2.63:1 |
| NC46-65(4IF) | 165.1 | 6-1/2 | 57.2 | 2-1/4 | 9150/9450 | 154.8 | 2.76:1 |
| NC46-65(4IF) | 165.1 | 6-1/2 | 71.4 | 2-13/16 | 9150/9450 | 154.8 | 3.05:1 |
| NC46-67(4IF) | 171.4 | 6-3/4 | 57.2 | 2-1/4 | 9150/9450 | 159.5 | 3.18:1 |
| NC50-67(4-1/2IF) | 171.4 | 6-3/4 | 71.4 | 2-13/16 | 9150/9450 | 159.5 | 2.37:1 |
| NC50-70(4-1/2IF) | 177.8 | 7 | 57.2 | 2-1/4 | 9150/9450 | 164.7 | 2.54:1 |
| NC50-70(4-1/2IF) | 177.8 | 7 | 71.4 | 2-13/16 | 9150/9450 | 164.7 | 2.73:1 |
| NC50-72(4-1/2IF) | 184.2 | 7-1/4 | 71.4 | 2-13/16 | 9150/9450 | 169.5 | 3.12:1 |
| NC56-77 | 196.8 | 7-3/4 | 71.4 | 2-13/16 | 9150/9450 | 185.3 | 2.70:1 |
| NC56-80 | 203.2 | 8 | 71.4 | 2-13/16 | 9150/9450 | 190.1 | 3.02:1 |
| 6-5/8REG | 209.6 | 8-1/4 | 71.4 | 2-13/16 | 9150/9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 2-13/16 | 9150/9450 | 212.7 | 3.17:1 |
| 7-5/8REG | 241.3 | 9-1/2 | 76.2 | 3 | 9150/9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 9-3/4 | 76.2 | 3 | 9150/9450 | 232.6 | 2.57:1 |
| NC70-100 | 254.0 | 10 | 76.2 | 3 | 9150/9450 | 237.3 | 2.81:1 |
Frequently Asked Questions
How can I place an order for these drill collars?
You can contact our sales team directly via message or email with your specific size and material requirements to initiate the ordering process.
What payment methods are accepted?
Standard payment methods include T/T (Bank Transfer), L/C, D/P, and Western Union. Other payment terms can be discussed during the confirmation of the Proforma Invoice (PI).
What is the typical production and delivery timeline?
For items not currently in stock, production typically takes 7-15 days. The process includes order confirmation, deposit payment, manufacturing, and final balance settlement before shipment.
How is product quality guaranteed?
All drill collars are inspected according to API SPEC 7-1 standards, including ultrasonic testing and visual dimensional checks. We maintain full traceability from raw material to finished product.
What happens if a defective product is received?
We take quality issues seriously. In the rare event of a defect, we provide replacements or issue credit toward your next shipment upon verification.
Are custom sizes and finishes available?
Yes, beyond the standard API sizes listed in our specification table, we can supply drill collars in custom lengths, diameters, and surface finishes to meet unique project demands.
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