Drill Collars

Drill Collars
For additional information on our Drill Collars offerings - please click here to download our brochure.
RDT drill collars are manufactured from 4145-modied continuous-line quenched and tempered steel. Strict metallurgical specifications are followed to ensure that full-length heat-treating produces a consistent maximum depth of hardness. After processing, each bar is inspected full-length ultrasonically and visually. This heat treated and carefully inspected steel is then bored with an inside diameter and drifted.

SPECIFICATIONS OVERVIEW:

  • Material Specifications:
    • Minimum yield: 120k Lbs
    • Minimum tensile: 130k Lbs
    • BHN: 285-341
  • Sizes: 2-7/8"-14"
  • Slick or Spiraled
  • Available with Slip recessed and/or zip
  • Special lengths as required (ie. 40 Feet)
  • Custom specifications
  • Non-Magnetic Drill Collars available

Standard Sizes, Bores and Connection for Drill Collars

Collar
 Number1 or
Size and Type
Minimum
Drill Collar OD
Bore
Tolerance
+1/16"-0"
Length (ft.)
Tolerance
+/-6
Bending
Strength
Ratio2
Approximate
Weight of
31 Ft.
Drill Collar (lbs)
NC 23-31
NC 26-35 (2-3/8 IF)
NC 31-41 (2-7/8 IF)
NC 38-47
NC 38-50 (3-1/2 IF)
3-1/8
3-1/2
4-1/8
4-3/4
5
1-1/4
1-1/2
2
2-1/4
2-1/4
30
30
30
31
31
2.57:1
2.42:1
2.43:1
1.85:1
2.38:1
660
800
1040
1451
1652
NC 44-60
NC 44-60
NC 44-62
NC 46-62 (4 IF)
6
6
6-1/4
6-1/4
2-1/4
2-13/16
2-1/4
2-13/16
31
31
31
31
2.49:1
2.84:1
2.91:1
2.63:1
2561
2353
2806
2598
NC 46-65 (4 IF)
NC 46-65 (4 IF)
NC 50
6-1/2
6-1/2
6-1/4
2-1/4
2-13/16
2-1/4
31
31
31
2.76:1
3.05:1
3.18:1
3085
2877
3364
NC 50-70 (4-1/2 IF)
NC 50-70 (4-1/2 IF)
NC 50-72 (4-1/2 IF)
NC 56-77
7
7
7-1/4
7-3/4
2-1/4
2-13/16
2-13/16
2-13/16
31
31
31
31
2.54:1
2.73:1
3.12:1
2.70:1
3643
3434
3714
4337
6-5/8 Reg
6-5/8 Reg
8
8-1/4
2-13/16
2-13/16
31
31
2.60:1
2.93:1
4675
5016
NC 61-90
7-5/8 Reg
7-5/8 Reg3
NC 70-100
8-5/8 Reg3
9
9-1/2
9-3/4
10
11
2-13/16
3
3
3
3
31
31
31
31
31
3.17:1
2.81:1
3.09:1
2.81:1
2.85:1
6070
6727
7130
7532
9269
1The Size and type in parentheses indicate interchangeable connections.
2 Ratio of box to pin section modulus (see API Specification RP7G for explanation).
3 Low-torque face.
All dimensions in inces unless otherwise specified.
Please contact your RDT representative for additional sizes and connections.
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Location

PO Box 73
9022 Vincik Ehlert
Beasley, TX 77417
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sales@rdt-usa.com

Tel: 979-387-3223
Fax: 979-387-3232

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