Thread data sheet

Basic Thread Dimensions

Property mm Inch
Nominal Diameter 300 11.811
Pitch (Distance) 4 0.1575
Pitch Diameter 297.402 11.7087
Minor Diameter 295.67 11.6406
Thread Height 2.165 0.0852
Addendum 1.299 0.0511
Crest (External)
Root (Internal)		 0.5 0.0197
Tap Drill Size
(75% depth)		 296.1 11.657
Lead Angle
(Single Start)		 0.25°
Thread Family Metric Fine Pitch (MF)
Relevant Standards ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13

For more threading data scroll down, or use the Thread Calculator

Choose the Threading Data you want to explore

Unified Inch Thread Classes

Tolerance Classes

Thread Milling CNC program

Thread Milling Gcode

Turning Gcode

Over Wire

Unified Inch Thread Classes

Tolerance Classes

Thread Milling Gcode

Turning Gcode

Over Wire

M300 X 4Possible Thread Classes

External Threads

4g, 4h, 6e, 6g, 6h, 8e, 8g, 5g4g, 5h4h, 5g6g, 7g6g, 7h6h, 7e6e, 9e8e, 9g8g

Metric ISO External Thread - Tolerance sketch

Internal Threads

4H, 5H, 5G, 6H, 6G, 7H, 7G, 8G

Metric ISO Internal Thread - Tolerance sketch

M300 X 4 4g (External)

* Permisable values for thread Class 4g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.64 - 299.94 11.7969 - 11.8087
d2 Pitch Diameter 297.162 - 297.342 11.6993 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.863 0.0197 - 0.034
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 299.7 - 300 11.7992 - 11.811
d2 Pitch Diameter 297.222 - 297.402 11.7017 - 11.7087
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.863 0.0197 - 0.034
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 6e (External)

* Permisable values for thread Class 6e

# Description Value (mm) Value (Inch)
es Allowance 0.095 (Ref) 0.0037 (Ref)
d Major Diameter 299.43 - 299.905 11.7886 - 11.8073
d2 Pitch Diameter 297.027 - 297.307 11.694 - 11.705
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.942 0.0197 - 0.0371
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 6g (External)

* Permisable values for thread Class 6g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.465 - 299.94 11.79 - 11.8087
d2 Pitch Diameter 297.062 - 297.342 11.6954 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.942 0.0197 - 0.0371
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 299.525 - 300 11.7923 - 11.811
d2 Pitch Diameter 297.122 - 297.402 11.6977 - 11.7087
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.942 0.0197 - 0.0371
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 8e (External)

* Permisable values for thread Class 8e

# Description Value (mm) Value (Inch)
es Allowance 0.095 (Ref) 0.0037 (Ref)
d Major Diameter 299.155 - 299.905 11.7778 - 11.8073
d2 Pitch Diameter 296.857 - 297.307 11.6873 - 11.705
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 1.058 0.0197 - 0.0417
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 8g (External)

* Permisable values for thread Class 8g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.19 - 299.94 11.7791 - 11.8087
d2 Pitch Diameter 296.892 - 297.342 11.6887 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 1.058 0.0197 - 0.0417
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 5g4g (External)

* Permisable values for thread Class 5g4g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.64 - 299.94 11.7969 - 11.8087
d2 Pitch Diameter 297.118 - 297.342 11.6976 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.899 0.0197 - 0.0354
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 299.7 - 300 11.7992 - 11.811
d2 Pitch Diameter 297.178 - 297.402 11.6999 - 11.7087
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.899 0.0197 - 0.0354
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 5g6g (External)

* Permisable values for thread Class 5g6g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.465 - 299.94 11.79 - 11.8087
d2 Pitch Diameter 297.118 - 297.342 11.6976 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.899 0.0197 - 0.0354
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 7g6g (External)

* Permisable values for thread Class 7g6g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.465 - 299.94 11.79 - 11.8087
d2 Pitch Diameter 296.987 - 297.342 11.6924 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.995 0.0197 - 0.0392
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 7h6h (External)

* Permisable values for thread Class 7h6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 299.525 - 300 11.7923 - 11.811
d2 Pitch Diameter 297.047 - 297.402 11.6948 - 11.7087
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.995 0.0197 - 0.0392
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 7e6e (External)

* Permisable values for thread Class 7e6e

# Description Value (mm) Value (Inch)
es Allowance 0.095 (Ref) 0.0037 (Ref)
d Major Diameter 299.43 - 299.905 11.7886 - 11.8073
d2 Pitch Diameter 296.952 - 297.307 11.691 - 11.705
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 0.995 0.0197 - 0.0392
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 9e8e (External)

* Permisable values for thread Class 9e8e

# Description Value (mm) Value (Inch)
es Allowance 0.095 (Ref) 0.0037 (Ref)
d Major Diameter 299.155 - 299.905 11.7778 - 11.8073
d2 Pitch Diameter 296.747 - 297.307 11.683 - 11.705
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 1.127 0.0197 - 0.0444
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 9g8g (External)

* Permisable values for thread Class 9g8g

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 299.19 - 299.94 11.7791 - 11.8087
d2 Pitch Diameter 296.782 - 297.342 11.6843 - 11.7064
R Root Radius 0.5 (Min) 0.0197 (Min)
C Root Truncation 0.5 - 1.127 0.0197 - 0.0444
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 295.67 - 296.045 11.6406 - 11.6553
D2 Pitch Diameter 297.402 - 297.638 11.7087 - 11.718
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 5H (Internal)

* Permisable values for thread Class 5H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 295.67 - 296.145 11.6406 - 11.6593
D2 Pitch Diameter 297.402 - 297.702 11.7087 - 11.7206
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 5G (Internal)

* Permisable values for thread Class 5G

# Description Value (mm) VValue (Inch)
EL Allowance 0.06 (Ref) 0.0024 (Ref)
D1 Minor Diameter 295.73 - 296.205 11.6429 - 11.6616
D2 Pitch Diameter 297.462 - 297.762 11.7111 - 11.7229
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 6H (Internal)

* Permisable values for thread Class 6H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 295.67 - 296.27 11.6406 - 11.6642
D2 Pitch Diameter 297.402 - 297.777 11.7087 - 11.7235
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 6G (Internal)

* Permisable values for thread Class 6G

# Description Value (mm) VValue (Inch)
EL Allowance 0.06 (Ref) 0.0024 (Ref)
D1 Minor Diameter 295.73 - 296.33 11.6429 - 11.6665
D2 Pitch Diameter 297.462 - 297.837 11.7111 - 11.7259
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 7H (Internal)

* Permisable values for thread Class 7H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 295.67 - 296.42 11.6406 - 11.6701
D2 Pitch Diameter 297.402 - 297.877 11.7087 - 11.7274
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 7G (Internal)

* Permisable values for thread Class 7G

# Description Value (mm) VValue (Inch)
EL Allowance 0.06 (Ref) 0.0024 (Ref)
D1 Minor Diameter 295.73 - 296.48 11.6429 - 11.6724
D2 Pitch Diameter 297.462 - 297.937 11.7111 - 11.7298
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M300 X 4 8G (Internal)

* Permisable values for thread Class 8G

# Description Value (mm) VValue (Inch)
EL Allowance 0.06 (Ref) 0.0024 (Ref)
D1 Minor Diameter 295.73 - 296.68 11.6429 - 11.6803
D2 Pitch Diameter 297.462 - 298.062 11.7111 - 11.7347
D Major Diameter 300 (Min) 11.811 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

Over Wire Measurements for M300 X 4


* 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 2.021 - 4.041 0.0796 - 0.1591
Ideal Wire Diameter 2.309 0.0909
Possible Wires
From Standard Sets		 * 2.309
* 2.598
* 2.887
* 3.175
* 3.464
 * 0.0825
* 0.0962
* 0.105
* 0.1155
* 0.1283
* 0.1443

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 M300 X 4

The below sample Gcode is configured for:

  • 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=300 MM, P=4 MM, L=40 MM)
(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)
(FEED - 15 PASSES, FLANK, CONSTANT VOLUME)
(FINISH PASS - 0.043 MM)
(WITH CHAMFER -  NO)
G28 U0 W0
T0101 G99 G97 S106 M03
G00 Z10.0
X 310.0 M08
G76 P010060 Q43 R0.043
G76 X295.093 Z-40.0 P2454 Q622 F4.0 R0.00 
G28 U0 W0
M09
M30
%

CNC Gcode Program for Thread Milling of M300 X 4

The below sample Gcode is configured for:

  • 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 


%
O101
(WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM)
(CONTROLER - FANUC)
(THREAD - D=300 MM, P=4 MM, L=40 MM)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER - D=150 [SINGLE TOOTH])
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S212 M03
G43 H1 Z20.0 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-40.5 F2000
G91 G01 G41 D1 X37.5 Y-37.5 F32
G03 X37.5 Y37.5 Z0.5 I0 J37.5 F8
G03 Z4.0 I-75.0 J0 F16
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 Z4.0 I-75.0 J0
G03 X-37.5 Y37.5 Z0.5 I-37.5 J0
G01 G40 X-37.5 Y-37.5 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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