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Engineering Reference · Metric Thread Dimensions

Metric Thread Dimensions

43 catalogued sizes, dimensioned to ISO 724 / ISO 965. Pick any row and the technical drawing redraws to it.

Metric Thread Dimensions to ISO 724 / ISO 965 are catalogued in sizes M1 to M80, with pitch 0.25-6 mm, dia 0.84-76.1 mm. 43 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard
ISO 724 / ISO 965
Size range
M1-M80
Pitch
0.25-6 mm
Dia
0.84-76.1 mm
Catalogued sizes
43

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

Metric Thread Dimensions technical product image

Metric Thread Dimensions are engineering reference manufactured to ISO 724 / ISO 965. This page lists the full dimensional range with the key specifications engineers need to select and specify them.

About This Reference

This is an engineering reference table for metric thread dimensions based on ISO 724 / ISO 965. Use it alongside our fastener catalog when selecting and specifying parts.

Reference Data (ISO 724 / ISO 965)

Size Pitch coarse (mm) Pitch diameter d2/D2 (mm) Minor dia external d3 (mm) Minor dia internal D1 (mm) Stress area (mm2) Reference standard
M1 0.25 0.838 0.693 0.729 0.46 ISO 724 / ISO 965-1
M1.1 0.25 0.938 0.793 0.829 0.606 ISO 724 / ISO 965-1
M1.2 0.25 1.038 0.893 0.929 0.732 ISO 724 / ISO 965-1
M1.4 0.3 1.205 1.032 1.075 1.0 ISO 724 / ISO 965-1
M1.6 0.35 1.373 1.171 1.221 1.27 ISO 724 / ISO 965-1
M1.8 0.35 1.573 1.371 1.421 1.7 ISO 724 / ISO 965-1
M2 0.4 1.74 1.509 1.567 2.07 ISO 724 / ISO 965-1
M2.2 0.45 1.908 1.648 1.713 2.48 ISO 724 / ISO 965-1
M2.5 0.45 2.208 1.948 2.013 3.39 ISO 724 / ISO 965-1
M3 0.5 2.675 2.387 2.459 5.03 ISO 724 / ISO 965-1
M3.5 0.6 3.11 2.764 2.85 6.78 ISO 724 / ISO 965-1
M4 0.7 3.545 3.141 3.242 8.78 ISO 724 / ISO 965-1
M4.5 0.75 4.013 3.58 3.688 11.3 ISO 724 / ISO 965-1
M5 0.8 4.48 4.019 4.134 14.2 ISO 724 / ISO 965-1
M6 1.0 5.35 4.773 4.917 20.1 ISO 724 / ISO 965-1
M7 1.0 6.35 5.773 5.917 28.9 ISO 724 / ISO 965-1
M8 1.25 7.188 6.466 6.647 36.6 ISO 724 / ISO 965-1
M9 1.25 8.188 7.466 7.647 51.0 ISO 724 / ISO 965-1
M10 1.5 9.026 8.16 8.376 58.0 ISO 724 / ISO 965-1
M11 1.5 10.026 9.16 9.376 72.3 ISO 724 / ISO 965-1
M12 1.75 10.863 9.853 10.106 84.3 ISO 724 / ISO 965-1
M14 2.0 12.701 11.546 11.835 115.0 ISO 724 / ISO 965-1
M16 2.0 14.701 13.546 13.835 157.0 ISO 724 / ISO 965-1
M18 2.5 16.376 14.933 15.294 193.0 ISO 724 / ISO 965-1
M20 2.5 18.376 16.933 17.294 245.0 ISO 724 / ISO 965-1
M22 2.5 20.376 18.933 19.294 303.0 ISO 724 / ISO 965-1
M24 3.0 22.051 20.32 20.752 353.0 ISO 724 / ISO 965-1
M27 3.0 25.051 23.32 23.752 459.0 ISO 724 / ISO 965-1
M30 3.5 27.727 25.706 26.211 561.0 ISO 724 / ISO 965-1
M33 3.5 30.727 28.706 29.211 694.0 ISO 724 / ISO 965-1
M36 4.0 33.402 31.093 31.67 817.0 ISO 724 / ISO 965-1
M39 4.0 36.402 34.093 34.67 976.0 ISO 724 / ISO 965-1
M42 4.5 39.077 36.479 37.129 1120.0 ISO 724 / ISO 965-1
M45 4.5 42.077 39.479 40.129 1310.0 ISO 724 / ISO 965-1
M48 5.0 44.752 41.866 42.587 1470.0 ISO 724 / ISO 965-1
M52 5.0 48.752 45.866 46.587 1760.0 ISO 724 / ISO 965-1
M56 5.5 52.428 49.252 50.046 2030.0 ISO 724 / ISO 965-1
M60 5.5 56.428 53.252 54.046 2360.0 ISO 724 / ISO 965-1
M64 6.0 60.103 56.639 57.505 2680.0 ISO 724 / ISO 965-1
M68 6.0 64.103 60.639 61.505 3060.0 ISO 724 / ISO 965-1
M72 6.0 68.103 64.639 65.505 3460.0 ISO 724 / ISO 965-1
M76 6.0 72.103 68.639 69.505 3900.0 ISO 724 / ISO 965-1
M80 6.0 76.103 72.639 73.505 4340.0 ISO 724 / ISO 965-1
Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Video: Metric Thread Dimensions

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

Frequently Asked Questions

What does the Metric Thread Dimensions reference table cover?

Metric Thread Dimensions is an engineering reference table aligned with ISO 724 / ISO 965. Use the values alongside our fastener catalog when selecting and specifying parts.

How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.