Basic Thread Dimensions
Property | mm | Inch |
---|---|---|
Nominal Diameter | 9 | 0.3543 |
Pitch (Distance) | 1.25 | 0.0492 |
Pitch Diameter | 8.188 | 0.3224 |
Minor Diameter | 7.647 | 0.3011 |
Thread Height | 0.677 | 0.0267 |
Addendum | 0.406 | 0.016 |
Crest (External) Root (Internal) |
0.156 | 0.0061 |
Tap Drill Size (75% depth) |
7.78 | 0.306 |
Lead Angle (Single Start) |
2.78° |
Thread Family | Metric Coarse Pitch (MC) | |
Relevant Standards | ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13 | |
Equivalent InchThread | 3/8 - 20 20-UN |
For more threading data scroll down, or use the Thread Calculator
Choose the Threading Data you want to explore
M9Possible Thread Classes
M9 4g (External)
* Permisable values for thread Class 4g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.84 - 8.972 | 0.348 - 0.3532 |
d2 | Pitch Diameter | 8.085 - 8.16 | 0.3183 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.285 | 0.0061 - 0.0112 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 4h (External)
* Permisable values for thread Class 4h
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0 (Ref) | 0 (Ref) |
d | Major Diameter | 8.868 - 9 | 0.3491 - 0.3543 |
d2 | Pitch Diameter | 8.113 - 8.188 | 0.3194 - 0.3224 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.285 | 0.0061 - 0.0112 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 6e (External)
* Permisable values for thread Class 6e
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.063 (Ref) | 0.0025 (Ref) |
d | Major Diameter | 8.725 - 8.937 | 0.3435 - 0.3519 |
d2 | Pitch Diameter | 8.007 - 8.125 | 0.3152 - 0.3199 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.316 | 0.0061 - 0.0124 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 6g (External)
* Permisable values for thread Class 6g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.76 - 8.972 | 0.3449 - 0.3532 |
d2 | Pitch Diameter | 8.042 - 8.16 | 0.3166 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.316 | 0.0061 - 0.0124 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 6h (External)
* Permisable values for thread Class 6h
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0 (Ref) | 0 (Ref) |
d | Major Diameter | 8.788 - 9 | 0.346 - 0.3543 |
d2 | Pitch Diameter | 8.07 - 8.188 | 0.3177 - 0.3224 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.316 | 0.0061 - 0.0124 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 8e (External)
* Permisable values for thread Class 8e
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.063 (Ref) | 0.0025 (Ref) |
d | Major Diameter | 8.602 - 8.937 | 0.3387 - 0.3519 |
d2 | Pitch Diameter | 7.935 - 8.125 | 0.3124 - 0.3199 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.361 | 0.0061 - 0.0142 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 8g (External)
* Permisable values for thread Class 8g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.637 - 8.972 | 0.34 - 0.3532 |
d2 | Pitch Diameter | 7.97 - 8.16 | 0.3138 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.361 | 0.0061 - 0.0142 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 5g4g (External)
* Permisable values for thread Class 5g4g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.84 - 8.972 | 0.348 - 0.3532 |
d2 | Pitch Diameter | 8.065 - 8.16 | 0.3175 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.3 | 0.0061 - 0.0118 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 5h4h (External)
* Permisable values for thread Class 5h4h
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0 (Ref) | 0 (Ref) |
d | Major Diameter | 8.868 - 9 | 0.3491 - 0.3543 |
d2 | Pitch Diameter | 8.093 - 8.188 | 0.3186 - 0.3224 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.3 | 0.0061 - 0.0118 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 5g6g (External)
* Permisable values for thread Class 5g6g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.76 - 8.972 | 0.3449 - 0.3532 |
d2 | Pitch Diameter | 8.065 - 8.16 | 0.3175 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.3 | 0.0061 - 0.0118 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 7g6g (External)
* Permisable values for thread Class 7g6g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.76 - 8.972 | 0.3449 - 0.3532 |
d2 | Pitch Diameter | 8.01 - 8.16 | 0.3154 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.337 | 0.0061 - 0.0133 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 7h6h (External)
* Permisable values for thread Class 7h6h
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0 (Ref) | 0 (Ref) |
d | Major Diameter | 8.788 - 9 | 0.346 - 0.3543 |
d2 | Pitch Diameter | 8.038 - 8.188 | 0.3165 - 0.3224 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.337 | 0.0061 - 0.0133 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 7e6e (External)
* Permisable values for thread Class 7e6e
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.063 (Ref) | 0.0025 (Ref) |
d | Major Diameter | 8.725 - 8.937 | 0.3435 - 0.3519 |
d2 | Pitch Diameter | 7.975 - 8.125 | 0.314 - 0.3199 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.337 | 0.0061 - 0.0133 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 9e8e (External)
* Permisable values for thread Class 9e8e
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.063 (Ref) | 0.0025 (Ref) |
d | Major Diameter | 8.602 - 8.937 | 0.3387 - 0.3519 |
d2 | Pitch Diameter | 7.889 - 8.125 | 0.3106 - 0.3199 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.387 | 0.0061 - 0.0152 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 9g8g (External)
* Permisable values for thread Class 9g8g
# | Description | Value (mm) | Value (Inch) |
---|---|---|---|
es | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
d | Major Diameter | 8.637 - 8.972 | 0.34 - 0.3532 |
d2 | Pitch Diameter | 7.924 - 8.16 | 0.312 - 0.3213 |
R | Root Radius | 0.156 (Min) | 0.0061 (Min) |
C | Root Truncation | 0.156 - 0.387 | 0.0061 - 0.0152 |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 4H (Internal)
* Permisable values for thread Class 4H
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0 (Ref) | 0 (Ref) |
D1 | Minor Diameter | 7.647 - 7.817 | 0.3011 - 0.3078 |
D2 | Pitch Diameter | 8.188 - 8.288 | 0.3224 - 0.3263 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 5H (Internal)
* Permisable values for thread Class 5H
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0 (Ref) | 0 (Ref) |
D1 | Minor Diameter | 7.647 - 7.859 | 0.3011 - 0.3094 |
D2 | Pitch Diameter | 8.188 - 8.313 | 0.3224 - 0.3273 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 5G (Internal)
* Permisable values for thread Class 5G
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
D1 | Minor Diameter | 7.675 - 7.887 | 0.3022 - 0.3105 |
D2 | Pitch Diameter | 8.216 - 8.341 | 0.3235 - 0.3284 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 6H (Internal)
* Permisable values for thread Class 6H
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0 (Ref) | 0 (Ref) |
D1 | Minor Diameter | 7.647 - 7.912 | 0.3011 - 0.3115 |
D2 | Pitch Diameter | 8.188 - 8.348 | 0.3224 - 0.3287 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 6G (Internal)
* Permisable values for thread Class 6G
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
D1 | Minor Diameter | 7.675 - 7.94 | 0.3022 - 0.3126 |
D2 | Pitch Diameter | 8.216 - 8.376 | 0.3235 - 0.3298 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 7H (Internal)
* Permisable values for thread Class 7H
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0 (Ref) | 0 (Ref) |
D1 | Minor Diameter | 7.647 - 7.982 | 0.3011 - 0.3143 |
D2 | Pitch Diameter | 8.188 - 8.388 | 0.3224 - 0.3302 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 7G (Internal)
* Permisable values for thread Class 7G
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
D1 | Minor Diameter | 7.675 - 8.01 | 0.3022 - 0.3154 |
D2 | Pitch Diameter | 8.216 - 8.416 | 0.3235 - 0.3313 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
M9 8G (Internal)
* Permisable values for thread Class 8G
# | Description | Value (mm) | VValue (Inch) |
---|---|---|---|
EL | Allowance | 0.028 (Ref) | 0.0011 (Ref) |
D1 | Minor Diameter | 7.675 - 8.1 | 0.3022 - 0.3189 |
D2 | Pitch Diameter | 8.216 - 8.466 | 0.3235 - 0.3333 |
D | Major Diameter | 9 (Min) | 0.3543 (Min) |
LE | Normal Length of Engagement | 4 - 12 | 0.1575 - 0.4724 |
* Back to Thread Class Selection
Tap Drill Sizes for M9
- If not specified, assume a thread depth of 75%.
- You can learn more about thread depth in tapping here.
- To get the tap drill size in other depths, use our Tap Drill Size Calculator .
Thread Depth | Tap Drill Size (Inch) | Tap Drill Size (mm) |
---|---|---|
55% | 0.319 | 8.11 |
60% | 0.316 | 8.03 |
65% | 0.313 | 7.94 |
70% | 0.310 | 7.86 |
75% | 0.306 | 7.78 |
80% | 0.303 | 7.70 |
85% | 0.300 | 7.62 |
Over Wire Measurements for M9
![](http://www.machiningdoctor.com/wp-content/uploads/2022/05/Over-wire-measurment.png)
* 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
mm | Inch | |
---|---|---|
Permissible Wire Diameter Range | 0.631 - 1.263 | 0.0249 - 0.0497 |
Ideal Wire Diameter | 0.722 | 0.0284 |
Possible Wires From Standard Sets |
* 0.722 * 0.866 * 1.01 * 1.155 |
* 0.0262 * 0.0289 |
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!
CNC Gcode Program for Turning of M9
The below sample Gcode is configured for:
![](https://www.machiningdoctor.com/wp-content/uploads/2023/12/App-ERT.png)
- Fanuc Controller
- External RH Thread
- Right hand tool, machining towards the chuck
- Flank Infeed method with contant volume
- Flank Infeed method with contant volume
- Cutting conditions for steel
- Default number of passes
You can configure all the above parameters and much more in our Thread Turning Gcode Generator
%
O0100
(MACHINING DOCTOR - THREADING CNC PROGRAM)
(CONTROLER - FANUC A)
(THREAD - )
(D=9 MM, P=1.25 MM, L=12.5 MM)
(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)
(FEED - 7 PASSES, FLANK, CONSTANT VOLUME)
(FINISH PASS - 0.027 MM)
(WITH CHAMFER - NO)
G28 U0
G28 U0
T0100
G99 G97 S3537 M03
G00 Z5.0
G00 X11.6 M08
G76 P010060 Q27 R0
G76 X7 Z-13 P767 Q280 F1 R
G28 U0
G28 U0
M09
M30
(PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.)
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CNC Gcode Program for Thread Milling of M9
The below sample Gcode is configured for:
![](/wp-content/uploads/2024/03/Int-RH-Climb.png)
- Fanuc Controller
- Internal RH Thread
- Climb Milling
- Cutter diameter: 70% of the thread diameter
- Single tooth Thread Mill cutter
- Cutting conditions for steel
- One radial pass
You can configure all the above parameters and much more in our Thread Milling Gcode Generator
%
O0101
(WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM)
(CONTROLER - FANUC)
(THREAD - MAJOR DIAM.=9 MM, PITCH=1.25 MM, LENGTH=12.5 MM)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER DIAM=4.5 [SINGLE TOOTH])
(CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER)
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S7074 M03
G43 H1 Z20.0 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-12.656 F2000
G91 G01 G41 D1 X1.125 Y-1.125 F1061
G03 X1.125 Y1.125 Z0.156 I0 J1.125 F266
G03 Z1.25 I-2.25 J0 F531
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 Z1.25 I-2.25 J0
G03 X-1.125 Y1.125 Z0.156 I-1.125 J0
G01 G40 X-1.125 Y-1.125 F2000
G90 G00 Z20.0
M30
(PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.)
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