M10 - Basic Thread Dimensions

Property mm Inch
Nominal Diameter 10 0.3937
Pitch (Distance) 1.5 0.0591
Pitch Diameter 9.026 0.3554
Minor Diameter 8.376 0.3298
Thread Height 0.812 0.032
Addendum 0.487 0.0192
Crest (External)
Root (Internal)
0.188 0.0074
Tap Drill Size
(75% depth)
8.54 0.336
Lead Angle
(Single Start)
3.03°
Thread Family Metric Coarse Pitch (MC)
Relevant Standards ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent Inch Thread3/8 - 16 UNC

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

Table of Content


M10 Possible Thread Classes

External Threads

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

Metric ISO External Thread - Tolerance sketch

Internal Threads

Choose tolerance class: 4H, 5H, 5G, 6H, 6G, 7H, 7G, 8G

Metric ISO Internal Thread - Tolerance sketch

M10 4g (External)

* Permisable values for thread Class 4g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.818 - 9.968 0.3865 - 0.3924
d2 Pitch Diameter 8.909 - 8.994 0.3507 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.338 0.0074 - 0.0133
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

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M10 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 9.85 - 10 0.3878 - 0.3937
d2 Pitch Diameter 8.941 - 9.026 0.352 - 0.3554
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.338 0.0074 - 0.0133
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

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M10 6e (External)

* Permisable values for thread Class 6e

# Description Value (mm) Value (Inch)
es Allowance 0.067 (Ref) 0.0026 (Ref)
d Major Diameter 9.697 - 9.933 0.3818 - 0.3911
d2 Pitch Diameter 8.827 - 8.959 0.3475 - 0.3527
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.373 0.0074 - 0.0147
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

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M10 6g (External)

* Permisable values for thread Class 6g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.732 - 9.968 0.3831 - 0.3924
d2 Pitch Diameter 8.862 - 8.994 0.3489 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.373 0.0074 - 0.0147
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

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M10 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 9.764 - 10 0.3844 - 0.3937
d2 Pitch Diameter 8.894 - 9.026 0.3502 - 0.3554
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.373 0.0074 - 0.0147
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 8e (External)

* Permisable values for thread Class 8e

# Description Value (mm) Value (Inch)
es Allowance 0.067 (Ref) 0.0026 (Ref)
d Major Diameter 9.558 - 9.933 0.3763 - 0.3911
d2 Pitch Diameter 8.747 - 8.959 0.3444 - 0.3527
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.424 0.0074 - 0.0167
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

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M10 8g (External)

* Permisable values for thread Class 8g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.593 - 9.968 0.3777 - 0.3924
d2 Pitch Diameter 8.782 - 8.994 0.3457 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.424 0.0074 - 0.0167
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 5g4g (External)

* Permisable values for thread Class 5g4g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.818 - 9.968 0.3865 - 0.3924
d2 Pitch Diameter 8.888 - 8.994 0.3499 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.354 0.0074 - 0.0139
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 9.85 - 10 0.3878 - 0.3937
d2 Pitch Diameter 8.92 - 9.026 0.3512 - 0.3554
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.354 0.0074 - 0.0139
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 5g6g (External)

* Permisable values for thread Class 5g6g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.732 - 9.968 0.3831 - 0.3924
d2 Pitch Diameter 8.888 - 8.994 0.3499 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.354 0.0074 - 0.0139
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 7g6g (External)

* Permisable values for thread Class 7g6g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.732 - 9.968 0.3831 - 0.3924
d2 Pitch Diameter 8.824 - 8.994 0.3474 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.398 0.0074 - 0.0157
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 7h6h (External)

* Permisable values for thread Class 7h6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 9.764 - 10 0.3844 - 0.3937
d2 Pitch Diameter 8.856 - 9.026 0.3487 - 0.3554
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.398 0.0074 - 0.0157
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 7e6e (External)

* Permisable values for thread Class 7e6e

# Description Value (mm) Value (Inch)
es Allowance 0.067 (Ref) 0.0026 (Ref)
d Major Diameter 9.697 - 9.933 0.3818 - 0.3911
d2 Pitch Diameter 8.789 - 8.959 0.346 - 0.3527
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.398 0.0074 - 0.0157
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 9e8e (External)

* Permisable values for thread Class 9e8e

# Description Value (mm) Value (Inch)
es Allowance 0.067 (Ref) 0.0026 (Ref)
d Major Diameter 9.558 - 9.933 0.3763 - 0.3911
d2 Pitch Diameter 8.694 - 8.959 0.3423 - 0.3527
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.454 0.0074 - 0.0179
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 9g8g (External)

* Permisable values for thread Class 9g8g

# Description Value (mm) Value (Inch)
es Allowance 0.032 (Ref) 0.0013 (Ref)
d Major Diameter 9.593 - 9.968 0.3777 - 0.3924
d2 Pitch Diameter 8.729 - 8.994 0.3437 - 0.3541
R Root Radius 0.188 (Min) 0.0074 (Min)
C Root Truncation 0.188 - 0.454 0.0074 - 0.0179
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 8.376 - 8.566 0.3298 - 0.3372
D2 Pitch Diameter 9.026 - 9.138 0.3554 - 0.3598
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 5H (Internal)

* Permisable values for thread Class 5H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 8.376 - 8.612 0.3298 - 0.3391
D2 Pitch Diameter 9.026 - 9.166 0.3554 - 0.3609
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 5G (Internal)

* Permisable values for thread Class 5G

# Description Value (mm) Value (Inch)
EL Allowance 0.032 (Ref) 0.0013 (Ref)
D1 Minor Diameter 8.408 - 8.644 0.331 - 0.3403
D2 Pitch Diameter 9.058 - 9.198 0.3566 - 0.3621
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 6H (Internal)

* Permisable values for thread Class 6H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 8.376 - 8.676 0.3298 - 0.3416
D2 Pitch Diameter 9.026 - 9.206 0.3554 - 0.3624
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 6G (Internal)

* Permisable values for thread Class 6G

# Description Value (mm) Value (Inch)
EL Allowance 0.032 (Ref) 0.0013 (Ref)
D1 Minor Diameter 8.408 - 8.708 0.331 - 0.3428
D2 Pitch Diameter 9.058 - 9.238 0.3566 - 0.3637
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 7H (Internal)

* Permisable values for thread Class 7H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 8.376 - 8.751 0.3298 - 0.3445
D2 Pitch Diameter 9.026 - 9.25 0.3554 - 0.3642
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 7G (Internal)

* Permisable values for thread Class 7G

# Description Value (mm) Value (Inch)
EL Allowance 0.032 (Ref) 0.0013 (Ref)
D1 Minor Diameter 8.408 - 8.783 0.331 - 0.3458
D2 Pitch Diameter 9.058 - 9.282 0.3566 - 0.3654
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


M10 8G (Internal)

* Permisable values for thread Class 8G

# Description Value (mm) Value (Inch)
EL Allowance 0.032 (Ref) 0.0013 (Ref)
D1 Minor Diameter 8.408 - 8.883 0.331 - 0.3497
D2 Pitch Diameter 9.058 - 9.338 0.3566 - 0.3676
D Major Diameter 10 (Min) 0.3937 (Min)
LE Normal Length of Engagement 5 - 15 0.1969 - 0.5906

* Back to Thread Class Selection


Tap Drill Sizes for M10

  • 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 Depth Tap Drill Size (Inch) Tap Drill Size (mm)
55% 0.352 8.93
60% 0.348 8.83
65% 0.344 8.73
70% 0.340 8.64
75% 0.336 8.54
80% 0.332 8.44
85% 0.328 8.34

Over Wire Measurements for M10


* 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 0.758 - 1.516 0.0298 - 0.0597
Ideal Wire Diameter 0.866 0.0341
Possible Wires
From Standard Sets
* 0.866
* 1.01
* 1.155
* 1.443

Once you knoe 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!


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