Thread data sheet

Basic Thread Dimensions

Property mm Inch
Nominal Diameter 280 11.0236
Pitch (Distance) 4 0.1575
Pitch Diameter 277.402 10.9213
Minor Diameter 275.67 10.8531
Thread Height 2.165 0.0852
Addendum 1.299 0.0511
Crest (External)
Root (Internal)		 0.5 0.0197
Tap Drill Size
(75% depth)		 276.1 10.87
Lead Angle
(Single Start)		 0.26°
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

M280 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

M280 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 279.64 - 279.94 11.0094 - 11.0213
d2 Pitch Diameter 277.162 - 277.342 10.9119 - 10.919
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

M280 X 4 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 279.7 - 280 11.0118 - 11.0236
d2 Pitch Diameter 277.222 - 277.402 10.9143 - 10.9213
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

M280 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 279.43 - 279.905 11.0012 - 11.0199
d2 Pitch Diameter 277.027 - 277.307 10.9066 - 10.9176
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

M280 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 279.465 - 279.94 11.0026 - 11.0213
d2 Pitch Diameter 277.062 - 277.342 10.908 - 10.919
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

M280 X 4 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 279.525 - 280 11.0049 - 11.0236
d2 Pitch Diameter 277.122 - 277.402 10.9103 - 10.9213
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

M280 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 279.155 - 279.905 10.9904 - 11.0199
d2 Pitch Diameter 276.857 - 277.307 10.8999 - 10.9176
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

M280 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 279.19 - 279.94 10.9917 - 11.0213
d2 Pitch Diameter 276.892 - 277.342 10.9013 - 10.919
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

M280 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 279.64 - 279.94 11.0094 - 11.0213
d2 Pitch Diameter 277.118 - 277.342 10.9102 - 10.919
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

M280 X 4 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 279.7 - 280 11.0118 - 11.0236
d2 Pitch Diameter 277.178 - 277.402 10.9125 - 10.9213
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

M280 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 279.465 - 279.94 11.0026 - 11.0213
d2 Pitch Diameter 277.118 - 277.342 10.9102 - 10.919
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

M280 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 279.465 - 279.94 11.0026 - 11.0213
d2 Pitch Diameter 276.987 - 277.342 10.905 - 10.919
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

M280 X 4 7h6h (External)

* Permisable values for thread Class 7h6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 279.525 - 280 11.0049 - 11.0236
d2 Pitch Diameter 277.047 - 277.402 10.9074 - 10.9213
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

M280 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 279.43 - 279.905 11.0012 - 11.0199
d2 Pitch Diameter 276.952 - 277.307 10.9036 - 10.9176
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

M280 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 279.155 - 279.905 10.9904 - 11.0199
d2 Pitch Diameter 276.747 - 277.307 10.8956 - 10.9176
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

M280 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 279.19 - 279.94 10.9917 - 11.0213
d2 Pitch Diameter 276.782 - 277.342 10.8969 - 10.919
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

M280 X 4 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 275.67 - 276.045 10.8531 - 10.8679
D2 Pitch Diameter 277.402 - 277.638 10.9213 - 10.9306
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 X 4 5H (Internal)

* Permisable values for thread Class 5H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 275.67 - 276.145 10.8531 - 10.8719
D2 Pitch Diameter 277.402 - 277.702 10.9213 - 10.9331
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 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 275.73 - 276.205 10.8555 - 10.8742
D2 Pitch Diameter 277.462 - 277.762 10.9237 - 10.9355
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 X 4 6H (Internal)

* Permisable values for thread Class 6H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 275.67 - 276.27 10.8531 - 10.8768
D2 Pitch Diameter 277.402 - 277.777 10.9213 - 10.9361
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 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 275.73 - 276.33 10.8555 - 10.8791
D2 Pitch Diameter 277.462 - 277.837 10.9237 - 10.9385
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 X 4 7H (Internal)

* Permisable values for thread Class 7H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 275.67 - 276.42 10.8531 - 10.8827
D2 Pitch Diameter 277.402 - 277.877 10.9213 - 10.94
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 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 275.73 - 276.48 10.8555 - 10.885
D2 Pitch Diameter 277.462 - 277.937 10.9237 - 10.9424
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

M280 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 275.73 - 276.68 10.8555 - 10.8929
D2 Pitch Diameter 277.462 - 278.062 10.9237 - 10.9473
D Major Diameter 280 (Min) 11.0236 (Min)
LE Normal Length of Engagement 26 - 80 1.0236 - 3.1496

* Back to Thread Class Selection

Over Wire Measurements for M280 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 M280 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=280 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 S114 M03
G00 Z10.0
X 290.0 M08
G76 P010060 Q43 R0.043
G76 X275.093 Z-40.0 P2454 Q622 F4.0 R0.00 
G28 U0 W0
M09
M30
%

CNC Gcode Program for Thread Milling of M280 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=280 MM, P=4 MM, L=40 MM)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER - D=140 [SINGLE TOOTH])
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S227 M03
G43 H1 Z20.0 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-40.5 F2000
G91 G01 G41 D1 X35.0 Y-35.0 F34
G03 X35.0 Y35.0 Z0.5 I0 J35.0 F9
G03 Z4.0 I-70.0 J0 F17
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 Z4.0 I-70.0 J0
G03 X-35.0 Y35.0 Z0.5 I-35.0 J0
G01 G40 X-35.0 Y-35.0 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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