Thread data sheet

Basic Thread Dimensions

Property mm Inch
Nominal Diameter 125 4.9213
Pitch (Distance) 8 0.315
Pitch Diameter 119.804 4.7167
Minor Diameter 116.34 4.5803
Thread Height 4.33 0.1705
Addendum 2.598 0.1023
Crest (External)
Root (Internal)		 1 0.0394
Tap Drill Size
(75% depth)		 117.2 4.614
Lead Angle
(Single Start)		 1.22°
Thread Family Metric Fine Pitch (MF)
Relevant Standards ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent InchThread4 7/8 - 4 4-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

M125 X 8Possible 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

M125 X 8 4g (External)

* Permisable values for thread Class 4g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 124.45 - 124.9 4.8996 - 4.9173
d2 Pitch Diameter 119.492 - 119.704 4.7044 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.59 0.0394 - 0.0626
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 124.55 - 125 4.9035 - 4.9213
d2 Pitch Diameter 119.592 - 119.804 4.7083 - 4.7167
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.59 0.0394 - 0.0626
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 6e (External)

* Permisable values for thread Class 6e

# Description Value (mm) Value (Inch)
es Allowance 0.14 (Ref) 0.0055 (Ref)
d Major Diameter 124.15 - 124.86 4.8878 - 4.9157
d2 Pitch Diameter 119.329 - 119.664 4.698 - 4.7112
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.705 0.0394 - 0.0671
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 6g (External)

* Permisable values for thread Class 6g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 124.19 - 124.9 4.8894 - 4.9173
d2 Pitch Diameter 119.369 - 119.704 4.6996 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.705 0.0394 - 0.0671
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 124.29 - 125 4.8933 - 4.9213
d2 Pitch Diameter 119.469 - 119.804 4.7035 - 4.7167
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.705 0.0394 - 0.0671
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 8e (External)

* Permisable values for thread Class 8e

# Description Value (mm) Value (Inch)
es Allowance 0.14 (Ref) 0.0055 (Ref)
d Major Diameter 123.68 - 124.86 4.8693 - 4.9157
d2 Pitch Diameter 119.134 - 119.664 4.6903 - 4.7112
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.862 0.0394 - 0.0733
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 8g (External)

* Permisable values for thread Class 8g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 123.72 - 124.9 4.8709 - 4.9173
d2 Pitch Diameter 119.174 - 119.704 4.6919 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.862 0.0394 - 0.0733
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 5g4g (External)

* Permisable values for thread Class 5g4g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 124.45 - 124.9 4.8996 - 4.9173
d2 Pitch Diameter 119.439 - 119.704 4.7023 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.641 0.0394 - 0.0646
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 124.55 - 125 4.9035 - 4.9213
d2 Pitch Diameter 119.539 - 119.804 4.7063 - 4.7167
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.641 0.0394 - 0.0646
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 5g6g (External)

* Permisable values for thread Class 5g6g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 124.19 - 124.9 4.8894 - 4.9173
d2 Pitch Diameter 119.439 - 119.704 4.7023 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.641 0.0394 - 0.0646
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 7g6g (External)

* Permisable values for thread Class 7g6g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 124.19 - 124.9 4.8894 - 4.9173
d2 Pitch Diameter 119.279 - 119.704 4.696 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.78 0.0394 - 0.0701
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 7h6h (External)

* Permisable values for thread Class 7h6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 124.29 - 125 4.8933 - 4.9213
d2 Pitch Diameter 119.379 - 119.804 4.7 - 4.7167
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.78 0.0394 - 0.0701
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 7e6e (External)

* Permisable values for thread Class 7e6e

# Description Value (mm) Value (Inch)
es Allowance 0.14 (Ref) 0.0055 (Ref)
d Major Diameter 124.15 - 124.86 4.8878 - 4.9157
d2 Pitch Diameter 119.239 - 119.664 4.6944 - 4.7112
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.78 0.0394 - 0.0701
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 9e8e (External)

* Permisable values for thread Class 9e8e

# Description Value (mm) Value (Inch)
es Allowance 0.14 (Ref) 0.0055 (Ref)
d Major Diameter 123.68 - 124.86 4.8693 - 4.9157
d2 Pitch Diameter 118.994 - 119.664 4.6848 - 4.7112
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.963 0.0394 - 0.0773
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 9g8g (External)

* Permisable values for thread Class 9g8g

# Description Value (mm) Value (Inch)
es Allowance 0.1 (Ref) 0.0039 (Ref)
d Major Diameter 123.72 - 124.9 4.8709 - 4.9173
d2 Pitch Diameter 119.034 - 119.704 4.6864 - 4.7128
R Root Radius 1 (Min) 0.0394 (Min)
C Root Truncation 1 - 1.963 0.0394 - 0.0773
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.34 - 116.97 4.5803 - 4.6051
D2 Pitch Diameter 119.804 - 120.084 4.7167 - 4.7277
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 5H (Internal)

* Permisable values for thread Class 5H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.34 - 117.14 4.5803 - 4.6118
D2 Pitch Diameter 119.804 - 120.159 4.7167 - 4.7307
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 5G (Internal)

* Permisable values for thread Class 5G

# Description Value (mm) VValue (Inch)
EL Allowance 0.1 (Ref) 0.0039 (Ref)
D1 Minor Diameter 116.44 - 117.24 4.5843 - 4.6157
D2 Pitch Diameter 119.904 - 120.259 4.7206 - 4.7346
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 6H (Internal)

* Permisable values for thread Class 6H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.34 - 117.34 4.5803 - 4.6197
D2 Pitch Diameter 119.804 - 120.254 4.7167 - 4.7344
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 6G (Internal)

* Permisable values for thread Class 6G

# Description Value (mm) VValue (Inch)
EL Allowance 0.1 (Ref) 0.0039 (Ref)
D1 Minor Diameter 116.44 - 117.44 4.5843 - 4.6236
D2 Pitch Diameter 119.904 - 120.354 4.7206 - 4.7383
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 7H (Internal)

* Permisable values for thread Class 7H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 116.34 - 117.59 4.5803 - 4.6295
D2 Pitch Diameter 119.804 - 120.364 4.7167 - 4.7387
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 7G (Internal)

* Permisable values for thread Class 7G

# Description Value (mm) VValue (Inch)
EL Allowance 0.1 (Ref) 0.0039 (Ref)
D1 Minor Diameter 116.44 - 117.69 4.5843 - 4.6335
D2 Pitch Diameter 119.904 - 120.464 4.7206 - 4.7427
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

M125 X 8 8G (Internal)

* Permisable values for thread Class 8G

# Description Value (mm) VValue (Inch)
EL Allowance 0.1 (Ref) 0.0039 (Ref)
D1 Minor Diameter 116.44 - 118.04 4.5843 - 4.6472
D2 Pitch Diameter 119.904 - 120.614 4.7206 - 4.7486
D Major Diameter 125 (Min) 4.9213 (Min)
LE Normal Length of Engagement 45 - 132 1.7717 - 5.1969

* Back to Thread Class Selection

Over Wire Measurements for M125 X 8


* 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 4.041 - 8.083 0.1591 - 0.3182
Ideal Wire Diameter 4.619 0.1818
Possible Wires
From Standard Sets		 * 4.042
* 4.619
* 5.196
* 5.774
 * 0.165
* 0.1777
* 0.1925
* 0.21
* 0.2887

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 M125 X 8

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=125 MM, P=8 MM, L=80 MM)
(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)
(FEED - 17 PASSES, FLANK, CONSTANT VOLUME)
(FINISH PASS - 0.075 MM)
(WITH CHAMFER -  NO)
G28 U0 W0
T0101 G99 G97 S255 M03
G00 Z10.0
X 135.0 M08
G76 P010060 Q75 R0.075
G76 X115.185 Z-80.0 P4907 Q1172 F8.0 R0.00 
G28 U0 W0
M09
M30
%

CNC Gcode Program for Thread Milling of M125 X 8

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=125 MM, P=8 MM, L=80 MM)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER - D=62.5 [SINGLE TOOTH])
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S509 M03
G43 H1 Z20.0 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-81.0 F2000
G91 G01 G41 D1 X15.625 Y-15.625 F76
G03 X15.625 Y15.625 Z1.0 I0 J15.625 F19
G03 Z8.0 I-31.25 J0 F38
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 Z8.0 I-31.25 J0
G03 X-15.625 Y15.625 Z1.0 I-15.625 J0
G01 G40 X-15.625 Y-15.625 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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