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

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

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