DTH Adaptors: Standard Adaptor Subs
Select a diameter to view the available adaptor sub specifications.
| Diameter (mm) | Diameter (in) | Length (mm) | Length (in)s | Box Thread | Pin Thread | Wrench Flat Width (mm) | Wrench Flat Width (in) |
|---|---|---|---|---|---|---|---|
| 76 | 3 | 100 | 3.94 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 130 | 5.12 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 160 | 6.30 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 180 | 7.09 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 200 | 7.87 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 220 | 8.66 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 250 | 9.84 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 260 | 10.24 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 280 | 11.02 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 300 | 11.81 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 320 | 12.60 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 340 | 13.39 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 360 | 14.17 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 380 | 14.96 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 400 | 15.75 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 420 | 16.54 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 440 | 17.32 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 460 | 18.11 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 500 | 19.68 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 520 | 20.47 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 76 | 3 | 540 | 21.26 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| Diameter (mm) | Diameter (in) | Length (mm) | Length (in)s | Box Thread | Pin Thread | Wrench Flat Width (mm) | Wrench Flat Width (in) |
|---|---|---|---|---|---|---|---|
| 89 | 3.50 | 100 | 3.94 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 130 | 5.12 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 170 | 6.69 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 200 | 7.87 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 220 | 8.66 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 250 | 9.84 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 270 | 10.63 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 300 | 11.81 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 320 | 12.60 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 350 | 13.78 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 380 | 14.96 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 400 | 15.75 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 430 | 16.93 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 450 | 17.72 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 480 | 18.90 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 500 | 19.68 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 530 | 20.87 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 550 | 21.65 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 580 | 22.83 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 600 | 23.62 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 650 | 25.59 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 680 | 26.77 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 700 | 27.56 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 730 | 28.74 | 2 3/8″ IF | 2 3/8″ IF | A/F65 | 2.5 |
| 89 | 3.50 | 750 | 29.53 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 780 | 30.71 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 810 | 31.89 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 830 | 32.68 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 860 | 33.86 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 880 | 34.65 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 910 | 35.83 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| 89 | 3.50 | 930 | 36.61 | 2 3/8″ API | 2 3/8″ API | A/F65 | 2.5 |
| Diameter (mm) | Diameter (in) | Length (mm) | Length (in)s | Box Thread | Pin Thread | Wrench Flat Width (mm) | Wrench Flat Width (in) |
|---|---|---|---|---|---|---|---|
| 102 | 4 | 120 | 4.72 | 2 3/8″ IF | 2 3/8″ IF | A/F75 | 3 |
| 102 | 4 | 140 | 5.51 | 2 3/8″ IF | 2 3/8″ IF | A/F75 | 3 |
| 102 | 4 | 180 | 7.09 | 2 7/8″ API | 2 7/8″ API | A/F75 | 3 |
| 102 | 4 | 210 | 8.27 | 2 3/8″ API | 2 3/8″ API | A/F75 | 3 |
| 102 | 4 | 300 | 11.81 | 2 3/8″ IF | 2 3/8″ IF | A/F75 | 3 |
| 102 | 4 | 360 | 14.17 | 2 7/8″ API | 2 7/8″ API | A/F75 | 3 |
| 102 | 4 | 410 | 16.14 | 3 1/2″ API | 3 1/2″ API | A/F75 | 3 |
| 102 | 4 | 480 | 18.90 | 3 1/2″ API | 3 1/2″ API | A/F65 | 3 |
| 102 | 4 | 520 | 20.47 | 2 7/8″ API | 2 7/8″ API | A/F75 | 3 |
| 102 | 4 | 600 | 23.62 | 2 7/8″ API | 2 7/8″ API | A/F75 | 3 |
| 102 | 4 | 660 | 25.98 | 3 1/2″ API | 3 1/2″ API | A/F75 | 3 |
| 102 | 4 | 700 | 27.56 | 2 7/8″ IF | 2 7/8″ IF | A/F75 | 3 |
| Diameter (mm) | Diameter (in) | Length (mm) | Length (in)s | Box Thread | Pin Thread | Wrench Flat Width (mm) | Wrench Flat Width (in) |
|---|---|---|---|---|---|---|---|
| 114 | 4.50 | 120 | 4.72 | 3 1/2″ API | 3 1/2″ API | A/F75 | 3 |
| 114 | 4.50 | 140 | 5.51 | 3 1/2″ API | 3″ BECO | A/F75 | 3 |
| 114 | 4.50 | 180 | 7.09 | 3 1/2″ API | 3 1/2″ API | A/F75 | 3 |
| 114 | 4.50 | 210 | 8.27 | 3″ BECO | 3″ BECO | A/F90 | 3.5 |
| 114 | 4.50 | 300 | 11.81 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 360 | 14.17 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 410 | 16.14 | 2 3/8″ IF | 2 7/8″ IF | A/F95 | 3.75 |
| 114 | 4.50 | 480 | 18.90 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 520 | 20.47 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 600 | 23.62 | 2 3/8″ API | 2 3/8″ API | A/F95 | 3.75 |
| 114 | 4.50 | 660 | 25.98 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 700 | 27.56 | 3 1/2″ IF | 3 1/2″ IF | A/F95 | 3.75 |
| 114 | 4.50 | 740 | 29.13 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 790 | 31.10 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 820 | 32.38 | 3 1/2″ IF | 3 1/2″ IF | A/F95 | 3.75 |
| 114 | 4.50 | 850 | 33.46 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 880 | 34.65 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 114 | 4.50 | 910 | 35.83 | 3 1/2″ IF | 3 1/2″ IF | A/F95 | 3.75 |
| 114 | 4.50 | 940 | 37.01 | 2 7/8″ API | 2 7/8″ API | A/F95 | 3.75 |
| 114 | 4.50 | 970 | 38.19 | NC35 | NC35 | A/F95 | 3.75 |
| Diameter (mm) | Diameter (in) | Length (mm) | Length (in)s | Box Thread | Pin Thread | Wrench Flat Width (mm) | Wrench Flat Width (in) |
|---|---|---|---|---|---|---|---|
| 127 | 5 | 300 | 11,81 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 127 | 5 | 360 | 14,17 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 127 | 5 | 410 | 16.14 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 127 | 5 | 480 | 18.90 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 127 | 5 | 520 | 20.47 | 3 1/2″ API | 3 1/2″ API | A/F95 | 3.75 |
| 127 | 5 | 600 | 23.62 | 3 1/2″ API | 3 1/2″ API | A/F95 | 4.75 |
| 127 | 5 | 700 | 27.56 | 3 1/2″ API | 3 1/2″ API | A/F95 | 5.75 |
| 127 | 5 | 820 | 32.28 | 3 1/2″ API | 3 1/2″ API | A/F95 | 6.75 |
| 127 | 5 | 910 | 35.83 | 3 1/2″ API | 3 1/2″ API | A/F95 | 7.75 |
| Diameter (mm) | Diameter (in) | Length (mm) | Length (in)s | Box Thread | Pin Thread | Wrench Flat Width (mm) | Wrench Flat Width (in) |
|---|---|---|---|---|---|---|---|
| 140 | 5.50 | 300 | 11.81 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 360 | 14.17 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 410 | 16.14 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 460 | 18.11 | 3 1/2″ API | 3 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 520 | 20.47 | 3 1/2″ API | 3 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 600 | 23.62 | 3 1/2″ IF | 3 1/2″ IF | A/F120 | 4.75 |
| 140 | 5.50 | 700 | 27.56 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 730 | 28.74 | 3 1/2″ API | 3 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 750 | 29.53 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 780 | 30.71 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 820 | 32.28 | 3 1/2″ API | 3 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 850 | 33.46 | 3 1/2″ API | 3 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 870 | 34.25 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 900 | 35.43 | 4 1/2″ API | 4 1/2″ API | A/F120 | 4.75 |
| 140 | 5.50 | 920 | 36.22 | 3 1/2″ API | 3 1/2″ API | A/F120 | 4.75 |
DTH Adaptors Selection Guide
North Star DTH Adaptors. Review DTH adaptor subs by diameter, length, pin and box thread, and wrench flat dimensions. Custom configurations on request.
Configuration and Application
The standard adaptor tables list diameter, length, box thread, pin thread and wrench flat width. Confirm both mating components before selecting a row. If the required connection is not listed, provide drawings and finished dimensions for review.
DTH Rotary Adaptor Requirements
When selecting dth rotary adaptor, provide the intended application, existing assembly details and the dimensions needed for the mating components. Include drawings, photographs or an existing part reference when available. Confirm the finished configuration with the quotation before ordering.
Related Tooling and Technical Background
Review Down the Hole (DTH) Drill Rods and DTH Deck Bushings for related North Star tooling. For general background on DTH drilling, see the DTH drilling reference. Product-specific dimensions and compatibility remain subject to the selected configuration.
Request DTH Adaptors
Send the required configuration, quantity and drawings for a quotation. Identify the connections and dimensions that must match the existing equipment. Our team can review the supplied information and confirm the applicable options.
3 Essential Fit Checks
- Check the adaptor body diameter, length and wrench-flat dimensions against the assembly.
- Match the pin thread to the corresponding box connection.
- Match the box thread to the mating pin and confirm the selected part reference before ordering.
