--- title: "Metric Thread Dimensions" description: "Metric Thread Dimensions to ISO 724 / ISO 965: sizes M1 to M80, pitch 0.25-6 mm, dia 0.84-76.1 mm. 43 catalogued sizes with materials and finishes." url: https://engineeringhardware.com/fastener/metric-thread-dimensions/ source: Engineering Hardware & Fasteners --- # Metric Thread Dimensions Engineering Reference · 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](https://engineeringhardware.com/wp-content/uploads/2026/06/Threaded-Rod-—-GB-T-15389-DIN-939-Series-095-—-GB-T-15389-DIN-939.webp) 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 | 0.588 | 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 | 0.983 | 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 | 48.1 | 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 | 192.0 | 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 | 3890.0 | 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](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 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. ## 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.