M20 X 2 : Thread Dimensions (Machining Doctor) (2024)

Table of Contents
Basic Thread Dimensions M20 X 2Possible Thread Classes M20 X 2 4g (External) M20 X 2 4h (External) M20 X 2 6e (External) M20 X 2 6g (External) M20 X 2 6h (External) M20 X 2 8e (External) M20 X 2 8g (External) M20 X 2 5g4g (External) M20 X 2 5h4h (External) M20 X 2 5g6g (External) M20 X 2 7g6g (External) M20 X 2 7h6h (External) M20 X 2 7e6e (External) M20 X 2 9e8e (External) M20 X 2 9g8g (External) M20 X 2 4H (Internal) M20 X 2 5H (Internal) M20 X 2 5G (Internal) M20 X 2 6H (Internal) M20 X 2 6G (Internal) M20 X 2 7H (Internal) M20 X 2 7G (Internal) M20 X 2 8G (Internal) Tap Drill Sizes for M20 X 2 Over Wire Measurements for M20 X 2 CNC Gcode Program for Turning of M20 X 2 CNC Gcode Program for Thread Milling of M20 X 2 Our Top Picks ThreaDoctor: Advanced thread Calculator Machinability Chart True position calculator and formulas Surface Finish: Calculators, Convertors, and Charts Hardness Conversion Calculator

Basic Thread Dimensions

PropertymmInch
Nominal Diameter200.7874
Pitch (Distance)20.0787
Pitch Diameter18.7010.7363
Minor Diameter17.8350.7022
Thread Height1.0830.0426
Addendum0.650.0256
Crest (External)
Root (Internal)		0.250.0098
Tap Drill Size
(75% depth)		18.050.711
Lead Angle
(Single Start)		1.95°
Thread FamilyMetric Fine Pitch (MF)
Relevant StandardsISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent InchThread13/16 - 12 12-UN
M20 X 2 : Thread Dimensions (Machining Doctor) (1)

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

Choose the Threading Data you want to explore

Tolerance Classes

Thread Milling Gcode

Turning Gcode

Over Wire

Tap Drill Size

Tolerance Classes

Thread Milling Gcode

Turning Gcode

M20 X 2Possible Thread Classes

External Threads

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

M20 X 2 : Thread Dimensions (Machining Doctor) (12)

Internal Threads

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

M20 X 2 : Thread Dimensions (Machining Doctor) (13)

M20 X 2 4g (External)

* Permisable values for thread Class 4g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.782 - 19.9620.7788 - 0.7859
d2Pitch Diameter18.563 - 18.6630.7308 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.440.0098 - 0.0173
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 4h (External)

* Permisable values for thread Class 4h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter19.82 - 200.7803 - 0.7874
d2Pitch Diameter18.601 - 18.7010.7323 - 0.7363
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.440.0098 - 0.0173
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 6e (External)

* Permisable values for thread Class 6e

#DescriptionValue (mm)Value (Inch)
esAllowance0.071 (Ref)0.0028 (Ref)
dMajor Diameter19.649 - 19.9290.7736 - 0.7846
d2Pitch Diameter18.47 - 18.630.7272 - 0.7335
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.4850.0098 - 0.0191
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 6g (External)

* Permisable values for thread Class 6g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.682 - 19.9620.7749 - 0.7859
d2Pitch Diameter18.503 - 18.6630.7285 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.4850.0098 - 0.0191
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 6h (External)

* Permisable values for thread Class 6h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter19.72 - 200.7764 - 0.7874
d2Pitch Diameter18.541 - 18.7010.73 - 0.7363
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.4850.0098 - 0.0191
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 8e (External)

* Permisable values for thread Class 8e

#DescriptionValue (mm)Value (Inch)
esAllowance0.071 (Ref)0.0028 (Ref)
dMajor Diameter19.479 - 19.9290.7669 - 0.7846
d2Pitch Diameter18.38 - 18.630.7236 - 0.7335
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5450.0098 - 0.0215
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 8g (External)

* Permisable values for thread Class 8g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.512 - 19.9620.7682 - 0.7859
d2Pitch Diameter18.413 - 18.6630.7249 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5450.0098 - 0.0215
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 5g4g (External)

* Permisable values for thread Class 5g4g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.782 - 19.9620.7788 - 0.7859
d2Pitch Diameter18.538 - 18.6630.7298 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.460.0098 - 0.0181
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 5h4h (External)

* Permisable values for thread Class 5h4h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter19.82 - 200.7803 - 0.7874
d2Pitch Diameter18.576 - 18.7010.7313 - 0.7363
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.460.0098 - 0.0181
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 5g6g (External)

* Permisable values for thread Class 5g6g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.682 - 19.9620.7749 - 0.7859
d2Pitch Diameter18.538 - 18.6630.7298 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.460.0098 - 0.0181
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 7g6g (External)

* Permisable values for thread Class 7g6g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.682 - 19.9620.7749 - 0.7859
d2Pitch Diameter18.463 - 18.6630.7269 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5130.0098 - 0.0202
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 7h6h (External)

* Permisable values for thread Class 7h6h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter19.72 - 200.7764 - 0.7874
d2Pitch Diameter18.501 - 18.7010.7284 - 0.7363
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5130.0098 - 0.0202
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 7e6e (External)

* Permisable values for thread Class 7e6e

#DescriptionValue (mm)Value (Inch)
esAllowance0.071 (Ref)0.0028 (Ref)
dMajor Diameter19.649 - 19.9290.7736 - 0.7846
d2Pitch Diameter18.43 - 18.630.7256 - 0.7335
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5130.0098 - 0.0202
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 9e8e (External)

* Permisable values for thread Class 9e8e

#DescriptionValue (mm)Value (Inch)
esAllowance0.071 (Ref)0.0028 (Ref)
dMajor Diameter19.479 - 19.9290.7669 - 0.7846
d2Pitch Diameter18.315 - 18.630.7211 - 0.7335
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5840.0098 - 0.023
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 9g8g (External)

* Permisable values for thread Class 9g8g

#DescriptionValue (mm)Value (Inch)
esAllowance0.038 (Ref)0.0015 (Ref)
dMajor Diameter19.512 - 19.9620.7682 - 0.7859
d2Pitch Diameter18.348 - 18.6630.7224 - 0.7348
RRoot Radius0.25 (Min)0.0098 (Min)
CRoot Truncation0.25 - 0.5840.0098 - 0.023
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 4H (Internal)

* Permisable values for thread Class 4H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter17.835 - 18.0710.7022 - 0.7115
D2Pitch Diameter18.701 - 18.8330.7363 - 0.7415
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 5H (Internal)

* Permisable values for thread Class 5H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter17.835 - 18.1350.7022 - 0.714
D2Pitch Diameter18.701 - 18.8710.7363 - 0.743
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 5G (Internal)

* Permisable values for thread Class 5G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.038 (Ref)0.0015 (Ref)
D1Minor Diameter17.873 - 18.1730.7037 - 0.7155
D2Pitch Diameter18.739 - 18.9090.7378 - 0.7444
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 6H (Internal)

* Permisable values for thread Class 6H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter17.835 - 18.210.7022 - 0.7169
D2Pitch Diameter18.701 - 18.9130.7363 - 0.7446
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 6G (Internal)

* Permisable values for thread Class 6G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.038 (Ref)0.0015 (Ref)
D1Minor Diameter17.873 - 18.2480.7037 - 0.7184
D2Pitch Diameter18.739 - 18.9510.7378 - 0.7461
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 7H (Internal)

* Permisable values for thread Class 7H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter17.835 - 18.310.7022 - 0.7209
D2Pitch Diameter18.701 - 18.9660.7363 - 0.7467
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 7G (Internal)

* Permisable values for thread Class 7G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.038 (Ref)0.0015 (Ref)
D1Minor Diameter17.873 - 18.3480.7037 - 0.7224
D2Pitch Diameter18.739 - 19.0040.7378 - 0.7482
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

M20 X 2 8G (Internal)

* Permisable values for thread Class 8G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.038 (Ref)0.0015 (Ref)
D1Minor Diameter17.873 - 18.4730.7037 - 0.7273
D2Pitch Diameter18.739 - 19.0740.7378 - 0.7509
DMajor Diameter20 (Min)0.7874 (Min)
LENormal Length of Engagement8 - 240.315 - 0.9449

* Back to Thread Class Selection

Tap Drill Sizes for M20 X 2

  • 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 DepthTap Drill Size (Inch)Tap Drill Size (mm)
55%0.73118.57
60%0.72618.44
65%0.72118.31
70%0.71618.18
75%0.71118.05
80%0.70617.92
85%0.70017.79

Over Wire Measurements for M20 X 2

M20 X 2 : Thread Dimensions (Machining Doctor) (14)

* 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

mmInch
Permissible Wire Diameter Range1.01 - 2.0210.0398 - 0.0796
Ideal Wire Diameter1.1550.0455
Possible Wires
From Standard Sets		* 1.01
* 1.155
* 1.443
* 1.732
* 2.021
* 0.0642
* 0.0722
* 0.077

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 M20 X 2

The below sample Gcode is configured for:

M20 X 2 : Thread Dimensions (Machining Doctor) (15)
  • 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 ThreadTurningGcodeGenerator 

%O0100(MACHINING DOCTOR - THREADING CNC PROGRAM)(CONTROLER - FANUC A)(THREAD - )(D=20 MM, P=2 MM, L=20 MM)(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)(FEED - 10 PASSES, FLANK, CONSTANT VOLUME)(FINISH PASS - 0.032 MM)(WITH CHAMFER - NO)G28 U0G28 U0T0100G99 G97 S1592 M03G00 Z6.0G00 X24.8 M08G76 P010060 Q32 R0G76 X18 Z-20 P1227 Q378 F2 RG28 U0G28 U0M09M30(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.)%

CNC Gcode Program for Thread Milling of M20 X 2

The below sample Gcode is configured for:

M20 X 2 : Thread Dimensions (Machining Doctor) (16)
  • 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 ThreadMillingGcodeGenerator 


%O0101(WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM)(CONTROLER - FANUC)(THREAD - MAJOR DIAM.=20 MM, PITCH=2 MM, LENGTH=20 MM)(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)(CUTTER DIAM=10 [SINGLE TOOTH])(CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER)N1 M06 T1G54G90 G40 G17 G94 G21G00 X0 Y0 S3183 M03G43 H1 Z20.0 M08(M-CODE "THROUGH COOLANT ON")(PASS 1 / 1)G90 G01 Z-20.25 F2000G91 G01 G41 D1 X2.5 Y-2.5 F477G03 X2.5 Y2.5 Z0.25 I0 J2.5 F120G03 Z2.0 I-5.0 J0 F239G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 Z2.0 I-5.0 J0G03 X-2.5 Y2.5 Z0.25 I-2.5 J0G01 G40 X-2.5 Y-2.5 F2000G90 G00 Z20.0M30(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.)%

Our Top Picks

  • ThreaDoctor: Advanced thread Calculator

  • Machinability Chart

  • True position calculator and formulas

  • Surface Finish: Calculators, Convertors, and Charts

  • Hardness Conversion Calculator

M20 X 2 : Thread Dimensions (Machining Doctor) (2024)
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