M22 X 1 - Basic Thread Dimensions

Property mm Inch
Nominal Diameter 22 0.8661
Pitch (Distance) 1 0.0394
Pitch Diameter 21.35 0.8406
Minor Diameter 20.917 0.8235
Thread Height 0.541 0.0213
Addendum 0.325 0.0128
Crest (External)
Root (Internal)		 0.125 0.0049
Tap Drill Size
(75% depth)		 21.03 0.828
Lead Angle
(Single Start)		 0.85°
Thread Family Metric Fine Pitch (MF)
Relevant Standards ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent Inch Thread7/8 - 28 28-UN

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

Table of Content

M22 X 1 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

M22 X 1 4g (External)

* Permisable values for thread Class 4g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.862 - 21.974 0.8607 - 0.8651
d2 Pitch Diameter 21.249 - 21.324 0.8366 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.239 0.0049 - 0.0094
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 21.888 - 22 0.8617 - 0.8661
d2 Pitch Diameter 21.275 - 21.35 0.8376 - 0.8406
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.239 0.0049 - 0.0094
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 6e (External)

* Permisable values for thread Class 6e

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 21.76 - 21.94 0.8567 - 0.8638
d2 Pitch Diameter 21.172 - 21.29 0.8335 - 0.8382
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.268 0.0049 - 0.0106
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 6g (External)

* Permisable values for thread Class 6g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.794 - 21.974 0.858 - 0.8651
d2 Pitch Diameter 21.206 - 21.324 0.8349 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.268 0.0049 - 0.0106
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 21.82 - 22 0.8591 - 0.8661
d2 Pitch Diameter 21.232 - 21.35 0.8359 - 0.8406
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.268 0.0049 - 0.0106
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 8e (External)

* Permisable values for thread Class 8e

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 21.66 - 21.94 0.8528 - 0.8638
d2 Pitch Diameter 21.1 - 21.29 0.8307 - 0.8382
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.31 0.0049 - 0.0122
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 8g (External)

* Permisable values for thread Class 8g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.694 - 21.974 0.8541 - 0.8651
d2 Pitch Diameter 21.134 - 21.324 0.832 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.31 0.0049 - 0.0122
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

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M22 X 1 5g4g (External)

* Permisable values for thread Class 5g4g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.862 - 21.974 0.8607 - 0.8651
d2 Pitch Diameter 21.229 - 21.324 0.8358 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.253 0.0049 - 0.01
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 21.888 - 22 0.8617 - 0.8661
d2 Pitch Diameter 21.255 - 21.35 0.8368 - 0.8406
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.253 0.0049 - 0.01
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 5g6g (External)

* Permisable values for thread Class 5g6g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.794 - 21.974 0.858 - 0.8651
d2 Pitch Diameter 21.229 - 21.324 0.8358 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.253 0.0049 - 0.01
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 7g6g (External)

* Permisable values for thread Class 7g6g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.794 - 21.974 0.858 - 0.8651
d2 Pitch Diameter 21.174 - 21.324 0.8336 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.288 0.0049 - 0.0113
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 7h6h (External)

* Permisable values for thread Class 7h6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 21.82 - 22 0.8591 - 0.8661
d2 Pitch Diameter 21.2 - 21.35 0.8346 - 0.8406
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.288 0.0049 - 0.0113
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 7e6e (External)

* Permisable values for thread Class 7e6e

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 21.76 - 21.94 0.8567 - 0.8638
d2 Pitch Diameter 21.14 - 21.29 0.8323 - 0.8382
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.288 0.0049 - 0.0113
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 9e8e (External)

* Permisable values for thread Class 9e8e

# Description Value (mm) Value (Inch)
es Allowance 0.06 (Ref) 0.0024 (Ref)
d Major Diameter 21.66 - 21.94 0.8528 - 0.8638
d2 Pitch Diameter 21.054 - 21.29 0.8289 - 0.8382
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.334 0.0049 - 0.0131
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 9g8g (External)

* Permisable values for thread Class 9g8g

# Description Value (mm) Value (Inch)
es Allowance 0.026 (Ref) 0.001 (Ref)
d Major Diameter 21.694 - 21.974 0.8541 - 0.8651
d2 Pitch Diameter 21.088 - 21.324 0.8302 - 0.8395
R Root Radius 0.125 (Min) 0.0049 (Min)
C Root Truncation 0.125 - 0.334 0.0049 - 0.0131
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 20.917 - 21.067 0.8235 - 0.8294
D2 Pitch Diameter 21.35 - 21.45 0.8406 - 0.8445
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 5H (Internal)

* Permisable values for thread Class 5H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 20.917 - 21.107 0.8235 - 0.831
D2 Pitch Diameter 21.35 - 21.475 0.8406 - 0.8455
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 5G (Internal)

* Permisable values for thread Class 5G

# Description Value (mm) Value (Inch)
EL Allowance 0.026 (Ref) 0.001 (Ref)
D1 Minor Diameter 20.943 - 21.133 0.8245 - 0.832
D2 Pitch Diameter 21.376 - 21.501 0.8416 - 0.8465
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 6H (Internal)

* Permisable values for thread Class 6H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 20.917 - 21.153 0.8235 - 0.8328
D2 Pitch Diameter 21.35 - 21.51 0.8406 - 0.8469
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 6G (Internal)

* Permisable values for thread Class 6G

# Description Value (mm) Value (Inch)
EL Allowance 0.026 (Ref) 0.001 (Ref)
D1 Minor Diameter 20.943 - 21.179 0.8245 - 0.8338
D2 Pitch Diameter 21.376 - 21.536 0.8416 - 0.8479
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 7H (Internal)

* Permisable values for thread Class 7H

# Description Value (mm) Value (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 20.917 - 21.217 0.8235 - 0.8353
D2 Pitch Diameter 21.35 - 21.55 0.8406 - 0.8484
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 7G (Internal)

* Permisable values for thread Class 7G

# Description Value (mm) Value (Inch)
EL Allowance 0.026 (Ref) 0.001 (Ref)
D1 Minor Diameter 20.943 - 21.243 0.8245 - 0.8363
D2 Pitch Diameter 21.376 - 21.576 0.8416 - 0.8494
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

M22 X 1 8G (Internal)

* Permisable values for thread Class 8G

# Description Value (mm) Value (Inch)
EL Allowance 0.026 (Ref) 0.001 (Ref)
D1 Minor Diameter 20.943 - 21.318 0.8245 - 0.8393
D2 Pitch Diameter 21.376 - 21.626 0.8416 - 0.8514
D Major Diameter 22 (Min) 0.8661 (Min)
LE Normal Length of Engagement 3.8 - 11 0.1496 - 0.4331

* Back to Thread Class Selection

Tap Drill Sizes for M22 X 1

  • 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% 0.838 21.29
60% 0.835 21.22
65% 0.833 21.16
70% 0.830 21.09
75% 0.828 21.03
80% 0.825 20.96
85% 0.823 20.90

Over Wire Measurements for M22 X 1


* 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 0.505 - 1.01 0.0199 - 0.0398
Ideal Wire Diameter 0.577 0.0227
Possible Wires
From Standard Sets		 * 0.52
* 0.577
* 0.722
* 0.866
 * 0.0206
* 0.0214
* 0.0222
* 0.0241
* 0.0262
* 0.0289

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!


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