Thread data sheet

Basic Thread Dimensions

Property mm Inch
Nominal Diameter 1.2 0.0472
Pitch (Distance) 0.2 0.0079
Pitch Diameter 1.07 0.0421
Minor Diameter 0.983 0.0387
Thread Height 0.108 0.0043
Addendum 0.065 0.0026
Crest (External)
Root (Internal)
0.025 0.001
Tap Drill Size
(75% depth)
1.01 0.04
Lead Angle
(Single Start)
3.4°
Thread Family Metric Fine Pitch (MF)
Relevant Standards ISO 68-1, ISO 9651-1, ISO 965-2, ISO 261,DIN 13
Equivalent InchThread#0 - 80 UNF

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

Table of Content


M1.2 X 0.2Possible Thread Classes

External Threads

4g, 4h, 6g, 6h, 5g4g, 5h4h, 5g6g

Metric ISO External Thread - Tolerance sketch

Internal Threads

4H

Metric ISO Internal Thread - Tolerance sketch

M1.2 X 0.2 4g (External)

* Permisable values for thread Class 4g

# Description Value (mm) Value (Inch)
es Allowance 0.017 (Ref) 0.0007 (Ref)
d Major Diameter 1.147 - 1.183 0.0452 - 0.0466
d2 Pitch Diameter 1.023 - 1.053 0.0403 - 0.0415
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.058 0.001 - 0.0023
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 4h (External)

* Permisable values for thread Class 4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 1.164 - 1.2 0.0458 - 0.0472
d2 Pitch Diameter 1.04 - 1.07 0.0409 - 0.0421
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.058 0.001 - 0.0023
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 6g (External)

* Permisable values for thread Class 6g

# Description Value (mm) Value (Inch)
es Allowance 0.017 (Ref) 0.0007 (Ref)
d Major Diameter 1.127 - 1.183 0.0444 - 0.0466
d2 Pitch Diameter 1.005 - 1.053 0.0396 - 0.0415
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.067 0.001 - 0.0026
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 6h (External)

* Permisable values for thread Class 6h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 1.144 - 1.2 0.045 - 0.0472
d2 Pitch Diameter 1.022 - 1.07 0.0402 - 0.0421
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.067 0.001 - 0.0026
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 5g4g (External)

* Permisable values for thread Class 5g4g

# Description Value (mm) Value (Inch)
es Allowance 0.017 (Ref) 0.0007 (Ref)
d Major Diameter 1.147 - 1.183 0.0452 - 0.0466
d2 Pitch Diameter 1.015 - 1.053 0.04 - 0.0415
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.062 0.001 - 0.0024
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 5h4h (External)

* Permisable values for thread Class 5h4h

# Description Value (mm) Value (Inch)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 1.164 - 1.2 0.0458 - 0.0472
d2 Pitch Diameter 1.032 - 1.07 0.0406 - 0.0421
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.062 0.001 - 0.0024
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 5g6g (External)

* Permisable values for thread Class 5g6g

# Description Value (mm) Value (Inch)
es Allowance 0.017 (Ref) 0.0007 (Ref)
d Major Diameter 1.127 - 1.183 0.0444 - 0.0466
d2 Pitch Diameter 1.015 - 1.053 0.04 - 0.0415
R Root Radius 0.025 (Min) 0.001 (Min)
C Root Truncation 0.025 - 0.062 0.001 - 0.0024
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


M1.2 X 0.2 4H (Internal)

* Permisable values for thread Class 4H

# Description Value (mm) VValue (Inch)
EL Allowance 0 (Ref) 0 (Ref)
D1 Minor Diameter 0.983 - 1.021 0.0387 - 0.0402
D2 Pitch Diameter 1.07 - 1.11 0.0421 - 0.0437
D Major Diameter 1.2 (Min) 0.0472 (Min)
LE Normal Length of Engagement 0.5 - 1.4 0.0197 - 0.0551

* Back to Thread Class Selection


Tap Drill Sizes for M1.2 X 0.2

  • 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 Depth Tap Drill Size (Inch) Tap Drill Size (mm)
55% 0.042 1.06
60% 0.041 1.04
65% 0.041 1.03
70% 0.040 1.02
75% 0.040 1.01
80% 0.039 0.99
85% 0.039 0.98

Over Wire Measurements for M1.2 X 0.2


* 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 0.101 - 0.202 0.004 - 0.008
Ideal Wire Diameter 0.115 0.0045
Possible Wires
From Standard Sets
* 0.116
* 0.13
* 0.144
* 0.173
* 0.006
* 0.0064
* 0.0072

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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