Thread data sheet

Basic Thread Dimensions

Property mm Inch
Nominal Diameter 120 4.7244
Pitch (Distance) 3 0.1181
Pitch Diameter 118.051 4.6477
Minor Diameter 116.752 4.5965
Thread Height 1.624 0.0639
Addendum 0.974 0.0383
Crest (External)
Root (Internal)		 0.375 0.0148
Tap Drill Size
(75% depth)		 117.08 4.609
Lead Angle
(Single Start)		 0.46°
Thread Family Metric Fine Pitch (MF)
Relevant Standards ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent InchThread4 3/4 - 8 8-UN

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

M120 X 3Possible 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

M120 X 3 4g (External)

* Permisable values for thread Class 4g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.716 - 119.952 4.7132 - 4.7225
d2 Pitch Diameter 117.863 - 118.003 4.6403 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.652 0.0148 - 0.0257
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 119.764 - 120 4.7151 - 4.7244
d2 Pitch Diameter 117.911 - 118.051 4.6422 - 4.6477
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.652 0.0148 - 0.0257
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 6e (External)

* Permisable values for thread Class 6e

# Description Value (mm) Value (Inch)
es Allowance 0.085 (Ref) 0.0033 (Ref)
d Major Diameter 119.54 - 119.915 4.7063 - 4.7211
d2 Pitch Diameter 117.742 - 117.966 4.6355 - 4.6443
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.717 0.0148 - 0.0282
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 6g (External)

* Permisable values for thread Class 6g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.577 - 119.952 4.7078 - 4.7225
d2 Pitch Diameter 117.779 - 118.003 4.637 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.717 0.0148 - 0.0282
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 119.625 - 120 4.7096 - 4.7244
d2 Pitch Diameter 117.827 - 118.051 4.6389 - 4.6477
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.717 0.0148 - 0.0282
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 8e (External)

* Permisable values for thread Class 8e

# Description Value (mm) Value (Inch)
es Allowance 0.085 (Ref) 0.0033 (Ref)
d Major Diameter 119.315 - 119.915 4.6974 - 4.7211
d2 Pitch Diameter 117.611 - 117.966 4.6304 - 4.6443
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.805 0.0148 - 0.0317
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 8g (External)

* Permisable values for thread Class 8g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.352 - 119.952 4.6989 - 4.7225
d2 Pitch Diameter 117.648 - 118.003 4.6318 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.805 0.0148 - 0.0317
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 5g4g (External)

* Permisable values for thread Class 5g4g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.716 - 119.952 4.7132 - 4.7225
d2 Pitch Diameter 117.823 - 118.003 4.6387 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.684 0.0148 - 0.0269
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 119.764 - 120 4.7151 - 4.7244
d2 Pitch Diameter 117.871 - 118.051 4.6406 - 4.6477
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.684 0.0148 - 0.0269
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 5g6g (External)

* Permisable values for thread Class 5g6g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.577 - 119.952 4.7078 - 4.7225
d2 Pitch Diameter 117.823 - 118.003 4.6387 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.684 0.0148 - 0.0269
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 7g6g (External)

* Permisable values for thread Class 7g6g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.577 - 119.952 4.7078 - 4.7225
d2 Pitch Diameter 117.723 - 118.003 4.6348 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.756 0.0148 - 0.0298
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 7h6h (External)

* Permisable values for thread Class 7h6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 119.625 - 120 4.7096 - 4.7244
d2 Pitch Diameter 117.771 - 118.051 4.6367 - 4.6477
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.756 0.0148 - 0.0298
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 7e6e (External)

* Permisable values for thread Class 7e6e

# Description Value (mm) Value (Inch)
es Allowance 0.085 (Ref) 0.0033 (Ref)
d Major Diameter 119.54 - 119.915 4.7063 - 4.7211
d2 Pitch Diameter 117.686 - 117.966 4.6333 - 4.6443
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.756 0.0148 - 0.0298
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 9e8e (External)

* Permisable values for thread Class 9e8e

# Description Value (mm) Value (Inch)
es Allowance 0.085 (Ref) 0.0033 (Ref)
d Major Diameter 119.315 - 119.915 4.6974 - 4.7211
d2 Pitch Diameter 117.516 - 117.966 4.6266 - 4.6443
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.863 0.0148 - 0.034
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 9g8g (External)

* Permisable values for thread Class 9g8g

# Description Value (mm) Value (Inch)
es Allowance 0.048 (Ref) 0.0019 (Ref)
d Major Diameter 119.352 - 119.952 4.6989 - 4.7225
d2 Pitch Diameter 117.553 - 118.003 4.6281 - 4.6458
R Root Radius 0.375 (Min) 0.0148 (Min)
C Root Truncation 0.375 - 0.863 0.0148 - 0.034
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.752 - 117.067 4.5965 - 4.6089
D2 Pitch Diameter 118.051 - 118.241 4.6477 - 4.6552
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 5H (Internal)

* Permisable values for thread Class 5H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.752 - 117.152 4.5965 - 4.6123
D2 Pitch Diameter 118.051 - 118.287 4.6477 - 4.657
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 5G (Internal)

* Permisable values for thread Class 5G

# Description Value (mm) VValue (Inch)
EL Allowance 0.048 (Ref) 0.0019 (Ref)
D1 Minor Diameter 116.8 - 117.2 4.5984 - 4.6142
D2 Pitch Diameter 118.099 - 118.335 4.6496 - 4.6589
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 6H (Internal)

* Permisable values for thread Class 6H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.752 - 117.252 4.5965 - 4.6162
D2 Pitch Diameter 118.051 - 118.351 4.6477 - 4.6595
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 6G (Internal)

* Permisable values for thread Class 6G

# Description Value (mm) VValue (Inch)
EL Allowance 0.048 (Ref) 0.0019 (Ref)
D1 Minor Diameter 116.8 - 117.3 4.5984 - 4.6181
D2 Pitch Diameter 118.099 - 118.399 4.6496 - 4.6614
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 7H (Internal)

* Permisable values for thread Class 7H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.752 - 117.382 4.5965 - 4.6213
D2 Pitch Diameter 118.051 - 118.426 4.6477 - 4.6624
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 7G (Internal)

* Permisable values for thread Class 7G

# Description Value (mm) VValue (Inch)
EL Allowance 0.048 (Ref) 0.0019 (Ref)
D1 Minor Diameter 116.8 - 117.43 4.5984 - 4.6232
D2 Pitch Diameter 118.099 - 118.474 4.6496 - 4.6643
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

M120 X 3 8G (Internal)

* Permisable values for thread Class 8G

# Description Value (mm) VValue (Inch)
EL Allowance 0.048 (Ref) 0.0019 (Ref)
D1 Minor Diameter 116.8 - 117.6 4.5984 - 4.6299
D2 Pitch Diameter 118.099 - 118.574 4.6496 - 4.6683
D Major Diameter 120 (Min) 4.7244 (Min)
LE Normal Length of Engagement 18 - 53 0.7087 - 2.0866

* Back to Thread Class Selection

Over Wire Measurements for M120 X 3


* 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 1.516 - 3.031 0.0597 - 0.1193
Ideal Wire Diameter 1.732 0.0682
Possible Wires
From Standard Sets		 * 1.732
* 2.021
* 2.309
* 2.598
* 2.887
 * 0.0642
* 0.0722
* 0.077
* 0.0825
* 0.0962
* 0.105
* 0.1155

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 M120 X 3

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=120 MM, P=3 MM, L=30 MM)
(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)
(FEED - 13 PASSES, FLANK, CONSTANT VOLUME)
(FINISH PASS - 0.037 MM)
(WITH CHAMFER -  NO)
G28 U0 W0
T0101 G99 G97 S265 M03
G00 Z9.0
X 130.0 M08
G76 P010060 Q37 R0.037
G76 X116.319 Z-30.0 P1840 Q500 F3.0 R0.00 
G28 U0 W0
M09
M30
%

CNC Gcode Program for Thread Milling of M120 X 3

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=120 MM, P=3 MM, L=30 MM)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER - D=60 [SINGLE TOOTH])
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S531 M03
G43 H1 Z20.0 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-30.375 F2000
G91 G01 G41 D1 X15.0 Y-15.0 F80
G03 X15.0 Y15.0 Z0.375 I0 J15.0 F20
G03 Z3.0 I-30.0 J0 F40
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 Z3.0 I-30.0 J0
G03 X-15.0 Y15.0 Z0.375 I-15.0 J0
G01 G40 X-15.0 Y-15.0 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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