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ISO 724 - Metric Threads

Dimensions of metric threads according ISO 724

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ISO 724 specifies basic dimensions of metric threads in accordance with ISO 261. Dimensions refer to the basic profile in accordance with ISO 68.

Bolt Metric Thread

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.

Metric Threads - Coarse Thread Pitches

Size - Nominal Diameter
(mm)
Pitch1)
(mm)
Clearance Drill
(mm)
Tap Drill
(mm)
Tensile Stress Area
(mm)
M 1.6 0.35 1.8 1.25
M 2 0.40 2.4 1.60
M 2.5 0.45 2.90 2.00
M 3 0.50 3.40 2.50
M 3.5 0.60 3.90 2.90
M 4 0.70 4.50 3.30 8.78
M 5 0.80 5.50 4.20 14.2
M 6 1.00 6.60 5.00 20.1
M 8 1.25 9.00 6.80 36.6
M 10 1.50 12.00 8.50 58.0
M 12 1.75 14.00 10.20 84.3
M 14 2.00 16.00 12.00
M 16 2.00 18.00 14.00 157
M 20 2.50 22.00 17.50 245
M 22 2.50 25.00 19.50
M 24 3.00 27.00 21.00 353
M 27 3.00 30.00 24.00
M 30 3.50 33.00 26.50 561
M 36 4.00 40.00 32.00 817
M 42 4.50 46.00 37.50 1120
M 48 5.00 53.00 43.00 1470
M 56 5.50 62.00 50.50 2030
M 64 6.00 70.00 58.00 2680
M 68 6.00 74.00 62.00

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

Metric Threads - Fine Thread Pitches

It is common to designate metric fine threads with the capital M plus an indication to their nominal outer diameter and their pitch:

M size x pitch

Example:

M 10 x 1.5

Size - Nominal Diameter
(mm)
Pitch1)
(mm)
Tap Drill
(mm)
Tebsile Stress Area
(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 20.1
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 39.2
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 64.5
M 10 x 1.25 1.25 8.80 61.2
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 92.1
M 12 x 1.5 1.50 10.50 88.1
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 15.00 178
M 16 x 1.5 1.50 14.50 167
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 18.50 272
M 20 x 2.0 2.00 18.00 258
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 22.50 401
M 24 x 2.0 2.00 22.00 384
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 28.00 621
M 30 x 3.0 3.00 27.00 581
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 34.00 915
M 36 x 3.0 3.00 33.00 865
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 1210
M 42 x 4.0 4.00 38.00 1150
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 1600
M 48 x 4.0 4.00 44.00 1540
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

Threads produced to this standard are interchangeable with threads produced to the metric standard ANSI/ASME B1.13M Metric Screw Threads: M Profile.

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