M18 X 1.5 : Thread Dimensions (Machining Doctor) (2024)

Table of Contents
Basic Thread Dimensions M18 X 1.5Possible Thread Classes M18 X 1.5 4g (External) M18 X 1.5 4h (External) M18 X 1.5 6e (External) M18 X 1.5 6g (External) M18 X 1.5 6h (External) M18 X 1.5 8e (External) M18 X 1.5 8g (External) M18 X 1.5 5g4g (External) M18 X 1.5 5h4h (External) M18 X 1.5 5g6g (External) M18 X 1.5 7g6g (External) M18 X 1.5 7h6h (External) M18 X 1.5 7e6e (External) M18 X 1.5 9e8e (External) M18 X 1.5 9g8g (External) M18 X 1.5 4H (Internal) M18 X 1.5 5H (Internal) M18 X 1.5 5G (Internal) M18 X 1.5 6H (Internal) M18 X 1.5 6G (Internal) M18 X 1.5 7H (Internal) M18 X 1.5 7G (Internal) M18 X 1.5 8G (Internal) Tap Drill Sizes for M18 X 1.5 Over Wire Measurements for M18 X 1.5 CNC Gcode Program for Turning of M18 X 1.5 CNC Gcode Program for Thread Milling of M18 X 1.5 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 Diameter180.7087
Pitch (Distance)1.50.0591
Pitch Diameter17.0260.6703
Minor Diameter16.3760.6447
Thread Height0.8120.032
Addendum0.4870.0192
Crest (External)
Root (Internal)		0.1880.0074
Tap Drill Size
(75% depth)		16.540.651
Lead Angle
(Single Start)		1.61°
Thread FamilyMetric Fine Pitch (MF)
Relevant StandardsISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent InchThread11/16 - 16 16-UN
M18 X 1.5 : 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

M18 X 1.5Possible Thread Classes

External Threads

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

M18 X 1.5 : Thread Dimensions (Machining Doctor) (12)

Internal Threads

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

M18 X 1.5 : Thread Dimensions (Machining Doctor) (13)

M18 X 1.5 4g (External)

* Permisable values for thread Class 4g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.818 - 17.9680.7015 - 0.7074
d2Pitch Diameter16.904 - 16.9940.6655 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3420.0074 - 0.0135
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 4h (External)

* Permisable values for thread Class 4h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter17.85 - 180.7028 - 0.7087
d2Pitch Diameter16.936 - 17.0260.6668 - 0.6703
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3420.0074 - 0.0135
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 6e (External)

* Permisable values for thread Class 6e

#DescriptionValue (mm)Value (Inch)
esAllowance0.067 (Ref)0.0026 (Ref)
dMajor Diameter17.697 - 17.9330.6967 - 0.706
d2Pitch Diameter16.819 - 16.9590.6622 - 0.6677
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3780.0074 - 0.0149
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 6g (External)

* Permisable values for thread Class 6g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.732 - 17.9680.6981 - 0.7074
d2Pitch Diameter16.854 - 16.9940.6635 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3780.0074 - 0.0149
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 6h (External)

* Permisable values for thread Class 6h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter17.764 - 180.6994 - 0.7087
d2Pitch Diameter16.886 - 17.0260.6648 - 0.6703
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3780.0074 - 0.0149
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 8e (External)

* Permisable values for thread Class 8e

#DescriptionValue (mm)Value (Inch)
esAllowance0.067 (Ref)0.0026 (Ref)
dMajor Diameter17.558 - 17.9330.6913 - 0.706
d2Pitch Diameter16.735 - 16.9590.6589 - 0.6677
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4310.0074 - 0.017
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 8g (External)

* Permisable values for thread Class 8g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.593 - 17.9680.6926 - 0.7074
d2Pitch Diameter16.77 - 16.9940.6602 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4310.0074 - 0.017
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 5g4g (External)

* Permisable values for thread Class 5g4g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.818 - 17.9680.7015 - 0.7074
d2Pitch Diameter16.882 - 16.9940.6646 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3580.0074 - 0.0141
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 5h4h (External)

* Permisable values for thread Class 5h4h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter17.85 - 180.7028 - 0.7087
d2Pitch Diameter16.914 - 17.0260.6659 - 0.6703
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3580.0074 - 0.0141
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 5g6g (External)

* Permisable values for thread Class 5g6g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.732 - 17.9680.6981 - 0.7074
d2Pitch Diameter16.882 - 16.9940.6646 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.3580.0074 - 0.0141
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 7g6g (External)

* Permisable values for thread Class 7g6g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.732 - 17.9680.6981 - 0.7074
d2Pitch Diameter16.814 - 16.9940.662 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4040.0074 - 0.0159
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 7h6h (External)

* Permisable values for thread Class 7h6h

#DescriptionValue (mm)Value (Inch)
esAllowance0 (Ref)0 (Ref)
dMajor Diameter17.764 - 180.6994 - 0.7087
d2Pitch Diameter16.846 - 17.0260.6632 - 0.6703
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4040.0074 - 0.0159
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 7e6e (External)

* Permisable values for thread Class 7e6e

#DescriptionValue (mm)Value (Inch)
esAllowance0.067 (Ref)0.0026 (Ref)
dMajor Diameter17.697 - 17.9330.6967 - 0.706
d2Pitch Diameter16.779 - 16.9590.6606 - 0.6677
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4040.0074 - 0.0159
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 9e8e (External)

* Permisable values for thread Class 9e8e

#DescriptionValue (mm)Value (Inch)
esAllowance0.067 (Ref)0.0026 (Ref)
dMajor Diameter17.558 - 17.9330.6913 - 0.706
d2Pitch Diameter16.679 - 16.9590.6567 - 0.6677
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4630.0074 - 0.0182
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 9g8g (External)

* Permisable values for thread Class 9g8g

#DescriptionValue (mm)Value (Inch)
esAllowance0.032 (Ref)0.0013 (Ref)
dMajor Diameter17.593 - 17.9680.6926 - 0.7074
d2Pitch Diameter16.714 - 16.9940.658 - 0.6691
RRoot Radius0.188 (Min)0.0074 (Min)
CRoot Truncation0.188 - 0.4630.0074 - 0.0182
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 4H (Internal)

* Permisable values for thread Class 4H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter16.376 - 16.5660.6447 - 0.6522
D2Pitch Diameter17.026 - 17.1440.6703 - 0.675
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 5H (Internal)

* Permisable values for thread Class 5H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter16.376 - 16.6120.6447 - 0.654
D2Pitch Diameter17.026 - 17.1760.6703 - 0.6762
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 5G (Internal)

* Permisable values for thread Class 5G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.032 (Ref)0.0013 (Ref)
D1Minor Diameter16.408 - 16.6440.646 - 0.6553
D2Pitch Diameter17.058 - 17.2080.6716 - 0.6775
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 6H (Internal)

* Permisable values for thread Class 6H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter16.376 - 16.6760.6447 - 0.6565
D2Pitch Diameter17.026 - 17.2160.6703 - 0.6778
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 6G (Internal)

* Permisable values for thread Class 6G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.032 (Ref)0.0013 (Ref)
D1Minor Diameter16.408 - 16.7080.646 - 0.6578
D2Pitch Diameter17.058 - 17.2480.6716 - 0.6791
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 7H (Internal)

* Permisable values for thread Class 7H

#DescriptionValue (mm)VValue (Inch)
ELAllowance0 (Ref)0 (Ref)
D1Minor Diameter16.376 - 16.7510.6447 - 0.6595
D2Pitch Diameter17.026 - 17.2620.6703 - 0.6796
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 7G (Internal)

* Permisable values for thread Class 7G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.032 (Ref)0.0013 (Ref)
D1Minor Diameter16.408 - 16.7830.646 - 0.6607
D2Pitch Diameter17.058 - 17.2940.6716 - 0.6809
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

M18 X 1.5 8G (Internal)

* Permisable values for thread Class 8G

#DescriptionValue (mm)VValue (Inch)
ELAllowance0.032 (Ref)0.0013 (Ref)
D1Minor Diameter16.408 - 16.8830.646 - 0.6647
D2Pitch Diameter17.058 - 17.3580.6716 - 0.6834
DMajor Diameter18 (Min)0.7087 (Min)
LENormal Length of Engagement5.6 - 160.2205 - 0.6299

* Back to Thread Class Selection

Tap Drill Sizes for M18 X 1.5

  • 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%0.66616.93
60%0.66316.83
65%0.65916.73
70%0.65516.64
75%0.65116.54
80%0.64716.44
85%0.64316.34

Over Wire Measurements for M18 X 1.5

M18 X 1.5 : 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 Range0.758 - 1.5160.0298 - 0.0597
Ideal Wire Diameter0.8660.0341
Possible Wires
From Standard Sets		* 0.866
* 1.01
* 1.155
* 1.443

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 M18 X 1.5

The below sample Gcode is configured for:

M18 X 1.5 : 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=18 MM, P=1.5 MM, L=15 MM)(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)(FEED - 8 PASSES, FLANK, CONSTANT VOLUME)(FINISH PASS - 0.029 MM)(WITH CHAMFER - NO)G28 U0G28 U0T0100G99 G97 S1768 M03G00 Z5.0G00 X22.4 M08G76 P010060 Q29 R0G76 X16 Z-15 P920 Q315 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 M18 X 1.5

The below sample Gcode is configured for:

M18 X 1.5 : 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.=18 MM, PITCH=1.5 MM, LENGTH=15 MM)(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)(CUTTER DIAM=9 [SINGLE TOOTH])(CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER)N1 M06 T1G54G90 G40 G17 G94 G21G00 X0 Y0 S3537 M03G43 H1 Z20.0 M08(M-CODE "THROUGH COOLANT ON")(PASS 1 / 1)G90 G01 Z-15.188 F2000G91 G01 G41 D1 X2.25 Y-2.25 F531G03 X2.25 Y2.25 Z0.188 I0 J2.25 F133G03 Z1.5 I-4.5 J0 F265G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 Z1.5 I-4.5 J0G03 X-2.25 Y2.25 Z0.188 I-2.25 J0G01 G40 X-2.25 Y-2.25 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

M18 X 1.5 : Thread Dimensions (Machining Doctor) (2024)
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