Threads - Metric ISO 724

M Thread (metric ISO 724 thread) European Standard

The European Standard M Thread - ISO 724:1993 "ISO general-purpose metric screw threads -- Basic dimensions" (DIN 13) is recognizable by its cylindrical outer and inner diameter in millimeters.

There are three kinds of ISO metric threads:

  • coarse
  • fine
  • extra fine

The thread angle is 60o. The thread depth is 0.614 x pitch.

Designation

Metric threads are designated with a capital M plus an indication to their nominal outer diameter and their pitch:

M size x pitch

Example:

M10 x 1.5

Metric Threads - Coarse Thread Pitches

Size - Nominal Diameter
(mm)
Pitch1)
(mm)
Clearance Drill
(mm)
Tap Drill
(mm)
M 1.60 0.35 1.8 1.25
M 2.00 0.40 2.4 1.60
M 2.50 0.45 2.90 2.00
M 3.00 0.50 3.40 2.50
M 3.50 0.60 3.90 2.90
M 4.00 0.70 4.50 3.30
M 5.00 0.80 5.50 4.20
M 6.00 1.00 6.60 5.00
M 8.00 1.25 9.00 6.80
M 10.00 1.50 12.00 8.50
M 12.00 1.75 14.00 10.20
M 14.00 2.00 16.00 12.00
M 16.00 2.00 18.00 14.00
M 20.00 2.50 22.00 17.50
M 22.00 2.50 25.00 19.50
M 24.00 3.00 27.00 21.00
M 27.00 3.00 30.00 24.00
M 30.00 3.50 33.00 26.50
M 36.00 4.00 40.00 32.00
M 42.00 4.50 46.00 37.50
M 48.00 5.00 53.00 43.00
M 56.00 5.50 62.00 50.50
M 64.00 6.00 70.00 58.00
M 68.00 6.00 74.00 62.00

1) For metric threads pitch is the distance between threads.

  • 1 mm ~= 0.03937 inches

Metric Threads - Fine Thread Pitches

Size - Nominal Diameter
(mm)
Pitch1)
(mm)
Tap Drill
(mm)
M 1.0 x 0.2 0.20 0.80
M 1.1 x 0.2 0.20 0.90
M 1.2 x 0.2 0.20 1.00
M 1.4 x 0.2 0.20 1.20
M 1.6 x 0.2 0.20 1.40
M 1.8 x 0.2 0.20 1.60
M 2 x 0.25 0.25 1.75
M 2.2 x 0.25 0.25 1.95
M 2.5 x 0.35 0.35 2.10
M 3 x 0.35 0.35 2.60
M 3.5 x 0.35 0.35 3.10
M 4 x 0.5 0.50 3.50
M 4.5 x 0.5 0.50 4.00
M 5 x 0.5 0.50 4.50
M 5.5 x 0.5 0.50 5.00
M 6 x 0.75 0.75 5.20
M 7 x 0.75 0.75 6.20
M 8 x 0.75 0.75 7.20
M 8 x 1.0 1.00 7.00
M 9 x 0.75 0.75 8.20
M 9 x 1 1.00 8.00
M 10 x 0.75 0.75 9.20
M 10 x 1 1.00 9.00
M 10 x 1.25 1.25 8.80
M 11 x 0.75 0.75 10.20
M 11 x 1 1.00 10.00
M 12 x 1 1.00 11.00
M 12 x 1.25 1.25 10.80
M 12 x 1.5 1.50 10.50
M 14 x 1.0 1.00 13.00
M 14 x 1.25 1.25 12.80
M 14 x 1.5 1.50 12.50
M 15 x 1 1.00 14.00
M 15 x 1.5 1.50 13.50
M 16 x 1 1.00 15.00
M 16 x 1.5 1.50 14.50
M 17 x 1.0 1.00 16.00
M 17 x 1.5 1.50 15.50
M 18 x 1.0 1.00 17.00
M 18 x 1.5 1.50 16.50
M 18 x 2.0 2.00 16.00
M 20 x 1.0 1.00 19.00
M 20 x 1.5 1.50 18.50
M 20 x 2.0 2.00 18.00
M 22 x 1.0 1.00 21.00
M 22 x 1.5 1.50 20.50
M 22 x 2.0 2.00 20.00
M 24 x 1.0 1.00 23.00
M 24 x 1.5 1.50 22.50
M 24 x 2.0 2.00 22.00
M 25 x 1.0 1.00 24.00
M 25 x 1.5 1.50 23.50
M 25 x 2.0 2.00 23.00
M 27 x 1.0 1.00 26.00
M 27 x 1.5 1.50 25.50
M 27 x 2.0 2.00 25.00
M 28 x 1.0 1.00 27.00
M 28 x 1.5 1.50 26.50
M 28 x 2.0 2.00 26.00
M 30 x 1.0 1.00 29.00
M 30 x 1.5 1.50 28.50
M 30 x 2.0 2.00 28.00
M 30 x 3.0 3.00 27.00
M 32 x 1.5 1.50 30.50
M 32 x 2.0 2.00 30.00
M 33 x 1.5 1.50 31.50
M 33 x 2.0 2.00 31.00
M 33 x 3.0 3.00 30.00
M 35 x 1.5 1.50 33.50
M 35 x 2.0 2.00 33.00
M 36 x 1.5 1.50 34.50
M 36 x 2.0 2.00 34.00
M 36 x 3.0 3.00 33.00
M 39 x 1.5 1.50 37.50
M 39 x 2.0 2.00 37.00
M 39 x 3.0 3.00 36.00
M 40 x 1.5 1.50 38.50
M 40 x 2.0 2.00 38.00
M 40 x 3.0 3.00 37.00
M 42 x 1.5 1.50 40.50
M 42 x 2.0 2.00 40.00
M 42 x 3.0 3.00 39.00
M 42 x 4.0 4.00 38.00
M 45 x 1.5 1.50 43.50
M 45 x 2.0 2.00 43.00
M 45 x 3.0 3.00 42.00
M 45 x 4.0 4.00 41.00
M 48 x 1.5 1.50 46.50
M 48 x 2.0 2.00 46.00
M 48 x 3.0 3.00 45.00
M 48 x 4.0 4.00 44.00
M 50 x 1.5 1.50 48.50
M 50 x 2.0 2.00 48.00
M 50 x 3.0 3.00 47.00
M 52 x 1.5 1.50 50.50
M 52 x 2.0 2.00 50.00
M 52 x 3.0 3.00 49.00
M 52 x 4.0 4.00 48.00
M 55 x 1.5 1.50 53.50
M 55 x 2.0 2.00 53.00
M 55 x 3.0 3.00 52.00
M 55 x 4.0 4.00 51.00
M 56 x 1.5 1.50 54.50
M 56 x 2.0 2.00 54.00
M 56 x 3.0 3.00 53.00
M 56 x 4.0 4.00 52.00
M 58 x 1.5 1.50 56.50
M 58 x 2.0 2.00 56.00
M 58 x 3.0 3.00 55.00
M 58 x 4.0 4.00 54.00
M 60 x 1.5 1.50 58.50
M 60 x 2.0 2.00 58.00
M 60 x 3.0 3.00 57.00
M 60 x 4.0 4.00 56.00
M 62 x 1.5 1.50 60.50
M 62 x 2.0 2.00 60.00
M 62 x 3.0 3.00 59.00
M 62 x 4.0 4.00 58.00
M 64 x 1.5 1.50 62.50
M 64 x 2.0 2.00 62.00
M 64 x 3.0 3.00 61.00
M 64 x 4.0 4.00 60.00
M 65 x 1.5 1.50 63.50
M 65 x 2.0 2.00 63.00
M 65 x 3.0 3.00 62.00
M 65 x 4.0 4.00 61.00
M 68 x 1.5 1.50 66.50
M 68 x 2.0 2.00 66.00
M 68 x 3.0 3.00 65.00
M 68 x 4.0 4.00 64.00
M 70 x 1.5 1.50 68.50
M 70 x 2.0 2.00 68.00
M 70 x 3.0 3.00 67.00
M 70 x 4.0 4.00 66.00
M 70 x 6.0 6.00 64.00
M 72 x 1.5 1.50 70.50
M 72 x 2.0 2.00 70.00
M 72 x 3.0 3.00 69.00
M 72 x 4.0 4.00 68.00
M 72 x 6.0 6.00 66.00
M 75 x 1.5 1.50 73.50
M 75 x 2.0 2.00 73.00
M 75 x 3.0 3.00 72.00
M 75 x 4.0 4.00 71.00
M 75 x 6.0 6.00 69.00
M 76 x 1.5 1.50 74.50
M 76 x 2.0 2.00 74.00
M 76 x 3.0 3.00 73.00
M 76 x 4.0 4.00 72.00
M 76 x 6.0 6.00 70.00
M 80 x 1.5 1.50 78.50
M 80 x 2.0 2.00 78.00
M 80 x 3.0 3.00 77.00
M 80 x 4.0 4.00 76.00
M 80 x 6.0 6.00 74.00
M 85 x 2.0 2.00 83.00
M 85 x 3.0 3.00 82.00
M 85 x 4.0 4.00 81.00
M 85 x 6.0 6.00 79.00
M 90 x 2.0 2.00 88.00
M 90 x 3.0 3.00 87.00
M 90 x 4.0 4.00 86.00
M 90 x 6.0 6.00 84.00
M 95 x 2.0 2.00 93.00
M 95 x 3.0 3.00 92.00
M 95 x 4.0 4.00 91.00
M 95 x 6.0 6.00 89.00
M 100 x 2.0 2.00 98.00
M 100 x 3.0 3.00 97.00
M 100 x 4.0 4.00 96.00
M 100 x 6.0 6.00 94.00

Related ISO Standards

  • ISO 68:1973 ISO general purpose screw threads - Basic profile
  • ISO 261:1973 ISO general purpose metric screw threads - General plan
  • ISO 262:1973 ISO general purpose metric screw threads - Selected sizes for screws, bolts and nuts
  • ISO 724:1993 ISO general-purpose metric screw threads - Basic dimensions
  • ISO 965-1:1980 ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data
  • ISO 965-2:1980 ISO general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality
  • ISO 965-3:1980 ISO general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads
  • ISO 1502:1996 ISO general-purpose metric screw threads - Gauges and gauging

Related Topics

  • Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more

Related Documents

Tag Search

Search the Engineering ToolBox

- "the most efficient way to navigate!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

close