Threads - Metric ISO 724

M Thread (metric ISO 724 thread) Standard in Europe

The M Thread - ISO 724:1993 "ISO general-purpose metric screw threads -- Basic dimensions" (DIN 13), the standard in Europe, is recognizable by its cylindrical outer and inner diameter and its precise outer 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

For instance:

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 1.0x0.2 0.20 0.80
M 1.1x0.2 0.20 0.90
M 1.2x0.2 0.20 1.00
M 1.4z0.2 0.20 1.20
M 1.6x0.2 0.20 1.40
M 1.8x0.2 0.20 1.60
M 2x0.25 0.25 1.75
M 2.2x0.25 0.25 1.95
M 2.5x0.35 0.35 2.10
M 3x0.35 0.35 2.60
M 3.5x0.35 0.35 3.10
M 4x0.5 0.50 3.50
M 4.5x0.5 0.50 4.00
M 5x0.5 0.50 4.50
M 5.5x0.5 0.50 5.00
M 6x0.75 0.75 5.20
M 7x0.75 0.75 6.20
M 8x0.75 0.75 7.20
M 8x1.0 1.00 7.00
M 9x0.75 0.75 8.20
M 9x 1 1.00 8.00
M 10x0.75 0.75 9.20
M 10x1 1.00 9.00
M 10x1.25 1.25 8.80
M 11x0.75 0.75 10.20
M 11x1 1.00 10.00
M 12x1 1.00 11.00
M 12x1.25 1.25 10.80
M 12x1.5 1.50 10.50
M 14x1.0 1.00 13.00
M 14x1.25 1.25 12.80
M 14x1.5 1.50 12.50
M 15x1 1.00 14.00
M 15x1.5 1.50 13.50
M 16x1 1.00 15.00
M 16x1.5 1.50 14.50
M 17x1.0 1.00 16.00
M 17x1.5 1.50 15.50
M 18x1.0 1.00 17.00
M 18x1.5 1.50 16.50
M 18x2.0 2.00 16.00
M 20x1.0 1.00 19.00
M 20x1.5 1.50 18.50
M 20x2.0 2.00 18.00
M 22x1.0 1.00 21.00
M 22x1.5 1.50 20.50
M 22x2.0 2.00 20.00
M 24x1.0 1.00 23.00
M 24x1.5 1.50 22.50
M 24x2.0 2.00 22.00
M 25x1.0 1.00 24.00
M 25x1.5 1.50 23.50
M 25x2.0 2.00 23.00
M 27x1.0 1.00 26.00
M 27x1.5 1.50 25.50
M 27x2.0 2.00 25.00
M 28x1.0 1.00 27.00
M 28x1.5 1.50 26.50
M 28x2.0 2.00 26.00
M 30x1.0 1.00 29.00
M 30x1.5 1.50 28.50
M 30x2.0 2.00 28.00
M 30x3.0 3.00 27.00
M 32x1.5 1.50 30.50
M 32x2.0 2.00 30.00
M 33x1.5 1.50 31.50
M 33x2.0 2.00 31.00
M 33x3.0 3.00 30.00
M 35x1.5 1.50 33.50
M 35x2.0 2.00 33.00
M 36x1.5 1.50 34.50
M 36x2.0 2.00 34.00
M 36x3.0 3.00 33.00
M 39x1.5 1.50 37.50
M 39x2.0 2.00 37.00
M 39x3.0 3.00 36.00
M 40x1.5 1.50 38.50
M 40x2.0 2.00 38.00
M 40x3.0 3.00 37.00
M 42x1.5 1.50 40.50
M 42x2.0 2.00 40.00
M 42x3.0 3.00 39.00
M 42x4.0 4.00 38.00
M 45x1.5 1.50 43.50
M 45x2.0 2.00 43.00
M 45x3.0 3.00 42.00
M 45x4.0 4.00 41.00
M 48x1.5 1.50 46.50
M 48x2.0 2.00 46.00
M 48x3.0 3.00 45.00
M 48x4.0 4.00 44.00
M 50x1.5 1.50 48.50
M 50x2.0 2.00 48.00
M 50x3.0 3.00 47.00
M 52x1.5 1.50 50.50
M 52x2.0 2.00 50.00
M 52x3.0 3.00 49.00
M 52x4.0 4.00 48.00
M 55x1.5 1.50 53.50
M 55x2.0 2.00 53.00
M 55x3.0 3.00 52.00
M 55x4.0 4.00 51.00
M 56x1.5 1.50 54.50
M 56x2.0 2.00 54.00
M 56x3.0 3.00 53.00
M 56x4.0 4.00 52.00
M 58x1.5 1.50 56.50
M 58x2.0 2.00 56.00
M 58x3.0 3.00 55.00
M 58x4.0 4.00 54.00
M 60x1.5 1.50 58.50
M 60x2.0 2.00 58.00
M 60x3.0 3.00 57.00
M 60x4.0 4.00 56.00
M 62x1.5 1.50 60.50
M 62x2.0 2.00 60.00
M 62x3.0 3.00 59.00
M 62x4.0 4.00 58.00
M 64x1.5 1.50 62.50
M 64x2.0 2.00 62.00
M 64x3.0 3.00 61.00
M 64x4.0 4.00 60.00
M 65x1.5 1.50 63.50
M 65x2.0 2.00 63.00
M 65x3.0 3.00 62.00
M 65x4.0 4.00 61.00
M 68x1.5 1.50 66.50
M 68x2.0 2.00 66.00
M 68x3.0 3.00 65.00
M 68x4.0 4.00 64.00
M 70x1.5 1.50 68.50
M 70x2.0 2.00 68.00
M 70x3.0 3.00 67.00
M 70x4.0 4.00 66.00
M 70x6.0 6.00 64.00
M 72x1.5 1.50 70.50
M 72x2.0 2.00 70.00
M 72x3.0 3.00 69.00
M 72x4.0 4.00 68.00
M 72x6.0 6.00 66.00
M 75x1.5 1.50 73.50
M 75x2.0 2.00 73.00
M 75x3.0 3.00 72.00
M 75x4.0 4.00 71.00
M 75x6.0 6.00 69.00
M 76x1.5 1.50 74.50
M 76x2.0 2.00 74.00
M 76x3.0 3.00 73.00
M 76x4.0 4.00 72.00
M 76x6.0 6.00 70.00
M 80x1.5 1.50 78.50
M 80x2.0 2.00 78.00
M 80x3.0 3.00 77.00
M 80x4.0 4.00 76.00
M 80x6.0 6.00 74.00
M 85x2.0 2.00 83.00
M 85x3.0 3.00 82.00
M 85x4.0 4.00 81.00
M 85x6.0 6.00 79.00
M 90x2.0 2.00 88.00
M 90x3.0 3.00 87.00
M 90x4.0 4.00 86.00
M 90x6.0 6.00 84.00
M 95x2.0 2.00 93.00
M 95x3.0 3.00 92.00
M 95x4.0 4.00 91.00
M 95x6.0 6.00 89.00
M 100x2.0 2.00 98.00
M 100x3.0 3.00 97.00
M 100x4.0 4.00 96.00
M 100x6.0 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 - Miscellaneous engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more

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