2.75-3 ACME - Basic Thread Dimensions
| Property | Inch | mm |
|---|---|---|
| Major Diameter (D) | 2.75 | 69.85 |
| Pitch (TPI) (P) | 3 | 3 |
| Pitch (Distance) (P) | 0.33333 | 8.467 |
| Pitch Diameter (D2) | 2.5833 | 65.616 |
| Minor Diameter (D1) | 2.4167 | 61.384 |
| Thread Height (h) | 0.16667 | 4.233 |
| Flat Width (F) | 0.1236 | 3.139 |
| Profile V Angle (2 X α) | 29° | 29° |
| Lead Angle (λ) | 2.352° | 2.352° |
| Tap Drill Size (Dt) | 2.41667 | 61.383 |
| Thread Family | Leadscrew Inch Thread (ACME) | |
| Relevant Standards | ASME B1.5 |
For more threading data scroll down, or use the ACME Thread CalculatorÂ
Table of Content
- Cutting conditions for External Threading (Thread Turning & Thread Milling)
- Cutting conditions for Internal Threading (Thread Turning, Thread Milling & Tapping)
- Over wire measurements
2.75-3 ACME Possible Thread Classes
The data listed below is valid only for Single Start Threads and engagement lengthsup to 5.5 For Multiple Starts and large LE's use our ACME Thread CalculatorÂ
2 3/4 - 3 ACME 2G (External)
* Permisable values forthread Class 2G
| # | Description | Value (Inch) | Value (mm) |
|---|---|---|---|
| d | Major Diameter | 2.7333 - 2.75 | 69.426 - 69.85 |
| d2 | Pitch Diameter | 2.5428 - 2.57 | 64.587 - 65.278 |
| d1 | Minor Diameter | 2.3558 - 2.3967 | 59.837 - 60.876 |
| P | Varation of Pitch (+/-) | 0.0012 | 0.03 |
| α | Varation of 14.5° anngle (+/-) | 0.37° | |
* Back to Thread Class Selection
2 3/4 - 3 ACME 3G (External)
* Permisable values forthread Class 3G
| # | Description | Value (Inch) | Value (mm) |
|---|---|---|---|
| d | Major Diameter | 2.7333 - 2.75 | 69.426 - 69.85 |
| d2 | Pitch Diameter | 2.5607 - 2.5734 | 65.042 - 65.364 |
| d1 | Minor Diameter | 2.3776 - 2.3967 | 60.391 - 60.876 |
| P | Varation of Pitch (+/-) | 0.0012 | 0.03 |
| α | Varation of 14.5° anngle (+/-) | 0.37° | |
* Back to Thread Class Selection
2 3/4 - 3 ACME 4G (External)
* Permisable values forthread Class 4G
| # | Description | Value (Inch) | Value (mm) |
|---|---|---|---|
| d | Major Diameter | 2.7333 - 2.75 | 69.426 - 69.85 |
| d2 | Pitch Diameter | 2.5676 - 2.5767 | 65.217 - 65.448 |
| d1 | Minor Diameter | 2.383 - 2.3967 | 60.528 - 60.876 |
| P | Varation of Pitch (+/-) | 0.0012 | 0.03 |
| α | Varation of 14.5° anngle (+/-) | 0.37° | |
* Back to Thread Class Selection
2 3/4 - 3 ACME 2C (External)
* Permisable values forthread Class 2C
| # | Description | Value (Inch) | Value (mm) |
|---|---|---|---|
| d | Major Diameter | 2.7442 - 2.75 | 69.703 - 69.85 |
| d2 | Pitch Diameter | 2.5428 - 2.57 | 64.587 - 65.278 |
| d1 | Minor Diameter | 2.3558 - 2.3967 | 59.837 - 60.876 |
| P | Varation of Pitch (+/-) | 0.0012 | 0.03 |
| α | Varation of 14.5° anngle (+/-) | 0.37° | |
* Back to Thread Class Selection
2 3/4 - 3 ACME 3C (External)
* Permisable values forthread Class 3C
| # | Description | Value (Inch) | Value (mm) |
|---|---|---|---|
| d | Major Diameter | 2.7475 - 2.75 | 69.787 - 69.85 |
| d2 | Pitch Diameter | 2.5607 - 2.5734 | 65.042 - 65.364 |
| d1 | Minor Diameter | 2.3776 - 2.3967 | 60.391 - 60.876 |
| P | Varation of Pitch (+/-) | 0.0012 | 0.03 |
| α | Varation of 14.5° anngle (+/-) | 0.37° | |
* Back to Thread Class Selection
2 3/4 - 3 ACME 4C (External)
* Permisable values forthread Class 4C
| # | Description | Value (Inch) | Value (mm) |
|---|---|---|---|
| d | Major Diameter | 2.7483 - 2.75 | 69.807 - 69.85 |
| d2 | Pitch Diameter | 2.5676 - 2.5767 | 65.217 - 65.448 |
| d1 | Minor Diameter | 2.383 - 2.3967 | 60.528 - 60.876 |
| P | Varation of Pitch (+/-) | 0.0012 | 0.03 |
| α | Varation of 14.5° anngle (+/-) | 0.37° | |
* Back to Thread Class Selection
2 3/4 - 3 ACME 2G ( Internal)
* Permisable values for thread Class 2G
| # | Description | Value () | Value () |
|---|---|---|---|
| D | Major Diameter | 2.77 - 2.79 | 70.358 - 70.866 |
| D2 | Pitch Diameter | 2.5833 - 2.6106 | 65.616 - 66.309 |
| D1 | Minor Diameter | 2.4167 - 2.4334 | 61.384 - 61.808 |
| P | Varation of Pitch (+/-) | 0.0012 (Ref) | 0.03 (Ref) |
| α | Varation of 14.5° anngle (+/-) | 0.37 (Ref) | 9.398 (Ref) |
* Back to Thread Class Selection
2 3/4 - 3 ACME 3G ( Internal)
* Permisable values for thread Class 3G
| # | Description | Value () | Value () |
|---|---|---|---|
| D | Major Diameter | 2.77 - 2.79 | 70.358 - 70.866 |
| D2 | Pitch Diameter | 2.5833 - 2.5961 | 65.616 - 65.941 |
| D1 | Minor Diameter | 2.4167 - 2.4334 | 61.384 - 61.808 |
| P | Varation of Pitch (+/-) | 0.0012 (Ref) | 0.03 (Ref) |
| α | Varation of 14.5° anngle (+/-) | 0.37 (Ref) | 9.398 (Ref) |
* Back to Thread Class Selection
2 3/4 - 3 ACME 4G ( Internal)
* Permisable values for thread Class 4G
| # | Description | Value () | Value () |
|---|---|---|---|
| D | Major Diameter | 2.77 - 2.79 | 70.358 - 70.866 |
| D2 | Pitch Diameter | 2.5833 - 2.5924 | 65.616 - 65.847 |
| D1 | Minor Diameter | 2.4167 - 2.4334 | 61.384 - 61.808 |
| P | Varation of Pitch (+/-) | 0.0012 (Ref) | 0.03 (Ref) |
| α | Varation of 14.5° anngle (+/-) | 0.37 (Ref) | 9.398 (Ref) |
* Back to Thread Class Selection
2 3/4 - 3 ACME 2C ( Internal)
* Permisable values for thread Class 2C
| # | Description | Value () | Value () |
|---|---|---|---|
| D | Major Diameter | 2.7517 - 2.7575 | 69.893 - 70.041 |
| D2 | Pitch Diameter | 2.5833 - 2.6106 | 65.616 - 66.309 |
| D1 | Minor Diameter | 2.45 - 2.4667 | 62.23 - 62.654 |
| P | Varation of Pitch (+/-) | 0.0012 (Ref) | 0.03 (Ref) |
| α | Varation of 14.5° anngle (+/-) | 0.37 (Ref) | 9.398 (Ref) |
* Back to Thread Class Selection
2 3/4 - 3 ACME 3C ( Internal)
* Permisable values for thread Class 3C
| # | Description | Value () | Value () |
|---|---|---|---|
| D | Major Diameter | 2.7517 - 2.7575 | 69.893 - 70.041 |
| D2 | Pitch Diameter | 2.5833 - 2.5961 | 65.616 - 65.941 |
| D1 | Minor Diameter | 2.45 - 2.4667 | 62.23 - 62.654 |
| P | Varation of Pitch (+/-) | 0.0012 (Ref) | 0.03 (Ref) |
| α | Varation of 14.5° anngle (+/-) | 0.37 (Ref) | 9.398 (Ref) |
* Back to Thread Class Selection
2 3/4 - 3 ACME 4C ( Internal)
* Permisable values for thread Class 4C
| # | Description | Value () | Value () |
|---|---|---|---|
| D | Major Diameter | 2.7517 - 2.755 | 69.893 - 69.977 |
| D2 | Pitch Diameter | 2.5833 - 2.5924 | 65.616 - 65.847 |
| D1 | Minor Diameter | 2.45 - 2.4667 | 62.23 - 62.654 |
| P | Varation of Pitch (+/-) | 0.0012 (Ref) | 0.03 (Ref) |
| α | Varation of 14.5° anngle (+/-) | 0.37 (Ref) | 9.398 (Ref) |
* Back to Thread Class Selection
Over Wire Measurements for 2.75-3 ACME
* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it here
| Inch | mm | |
|---|---|---|
| Permissible Wire Diameter Range | 0.16354 - 0.25823 | 4.154 - 6.5589 |
| Ideal Wire Diameter | 0.17215 | 4.3726 |
| Possible Wires From Standard Sets |
* 0.16496 * 0.17765 * 0.19245 * 0.20995 |
* 4.6188 * 5.1962 * 5.7735 |
Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!
