Dowel pins ISO 2338 and ISO 8734 (parallel pins, m6 and h8), 0.6–50 mm: diameter limits, chamfer c, commercial lengths — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/dowel-pins-iso-2338-8734/ (sheet CC BY 4.0) Basis: ISO 2338:1997 and ISO 8734:1997 sample pages (iTeh), opac.net's ISO 2338 sheet and Westfield's DIN 7 sheet as cross-checks, ISO 286 deviations for m6 and h8 from three tables; numbers only Catalog version: 2026-10-20 Sizes: see table below - ISO 2338 is the unhardened parallel pin (steel or austenitic stainless), nominal diameters 0.6 to 50 mm, tolerance class m6 or h8 (the designation example is 'ISO 2338 - 6 m6 x 30 - St'; other tolerances by agreement). ISO 8734 is the hardened dowel pin (hardened steel or martensitic stainless), 1 to 20 mm, m6 only. Both end with a chamfer c; the column c is the standard's 'c approx.' from the ISO 2338 and ISO 8734 sample pages (the text of the ISO 2338 pages was OCR and the extraction flagged its c values as reconstructed; the values agree with opac.net's ISO 2338 sheet for the 20 sizes of the standard, where opac also lists a 14 mm size with no c, and with the c values of the ISO 8734 page). - Diameter limits are computed here: the nominal diameter plus the ISO 286-2 limit deviation of its size band, listed in micrometres in the two right-hand columns. m6 deviations are +8 / +2 (up to 3 mm), +12 / +4 (3 to 6), +15 / +6 (6 to 10), +18 / +7 (10 to 18), +21 / +8 (18 to 30), +25 / +9 (30 to 50): Westfield's table, Emile Maurin's sheet and CAD Forum agree. h8 deviations are 0 / -14, -18, -22, -27, -33, -39 for the same bands: Emile Maurin gives all six, CAD Forum and Simply Bearings give 3 mm and up (their tables start at 'over 3'). A diameter on a band's upper boundary (3, 6, 10, 18 mm) is taken in the lower band, as ISO 286 bands are 'over x up to and including y'. h8 applies to ISO 2338 only; ISO 8734 pins are m6. - Surface roughness (ISO 2338 page text): Ra up to 0.8 µm for m6 and up to 1.6 µm for h8. Commercial nominal lengths in ISO 2338 are 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 120, 140, 160, 180, 200 mm (above 200 mm in 20 mm steps) with a length limit of ±0.25 mm up to 10 mm, ±0.5 mm for 12 to 50 mm and ±0.75 mm for 55 to 200 mm (the min / max column of the sample page; opac.net prints the same three tolerances). ISO 8734 lengths are the same list from 3 to 100 mm (above 100 mm in 20 mm steps), with the same limits. The standards' table also marks which lengths exist for each diameter; that dot matrix did not survive text extraction in either sample page or opac's sheet, so the per-diameter length range is not tabulated. - ISO 8734 hardness as printed on its sample pages: 550 to 650 HV30 (through-hardened steel), surface 600 to 700 HV1 with at least 550 HV1 at 0.25 to 0.4 mm depth (case-hardened steel), 460 to 560 HV30 (tempered martensitic stainless); the extraction flagged that which range belongs to which type was ambiguous in the layout, so the page lists the ranges but does not map them. Dimensions apply before plating or coating. - DIN 7 (unhardened; replaced by ISO 2338) and DIN 6325 (hardened; replaced by ISO 8734) are the older German pins; Westfield's DIN 7 sheet prints c max (for example 0.45 for 3 mm) and r approx. rather than ISO's 'c approx.', so the two chamfer columns are different quantities and are not merged. The existing page dowel-pins-metric has 2 to 6 mm dowels with press and slip hole sizes; this page is the full standard range with the limits. - No file: a dowel pin is a cylinder with a chamfer at each end, which would be a plain primitive; the chamfer angle is not in the sources read. MISUMI and the standard-body pages are linked for CAD. standard d (nominal, mm) m6 limits max / min (mm, computed) h8 limits max / min (mm, ISO 2338 only, computed) m6 deviations (µm) h8 deviations (µm) c approx. (mm) ISO 2338 0.6 0.608 / 0.602 0.6 / 0.586 8 / 2 0 / -14 0.12 ISO 2338 0.8 0.808 / 0.802 0.8 / 0.786 8 / 2 0 / -14 0.16 ISO 2338 + ISO 8734 1 1.008 / 1.002 1 / 0.986 8 / 2 0 / -14 0.2 ISO 2338 1.2 1.208 / 1.202 1.2 / 1.186 8 / 2 0 / -14 0.25 ISO 2338 + ISO 8734 1.5 1.508 / 1.502 1.5 / 1.486 8 / 2 0 / -14 0.3 ISO 2338 + ISO 8734 2 2.008 / 2.002 2 / 1.986 8 / 2 0 / -14 0.35 ISO 2338 + ISO 8734 2.5 2.508 / 2.502 2.5 / 2.486 8 / 2 0 / -14 0.4 ISO 2338 + ISO 8734 3 3.008 / 3.002 3 / 2.986 8 / 2 0 / -14 0.5 ISO 2338 + ISO 8734 4 4.012 / 4.004 4 / 3.982 12 / 4 0 / -18 0.63 ISO 2338 + ISO 8734 5 5.012 / 5.004 5 / 4.982 12 / 4 0 / -18 0.8 ISO 2338 + ISO 8734 6 6.012 / 6.004 6 / 5.982 12 / 4 0 / -18 1.2 ISO 2338 + ISO 8734 8 8.015 / 8.006 8 / 7.978 15 / 6 0 / -22 1.6 ISO 2338 + ISO 8734 10 10.015 / 10.006 10 / 9.978 15 / 6 0 / -22 2 ISO 2338 + ISO 8734 12 12.018 / 12.007 12 / 11.973 18 / 7 0 / -27 2.5 ISO 2338 + ISO 8734 16 16.018 / 16.007 16 / 15.973 18 / 7 0 / -27 3 ISO 2338 + ISO 8734 20 20.021 / 20.008 20 / 19.967 21 / 8 0 / -33 3.5 ISO 2338 25 25.021 / 25.008 25 / 24.967 21 / 8 0 / -33 4 ISO 2338 30 30.021 / 30.008 30 / 29.967 21 / 8 0 / -33 5 ISO 2338 40 40.025 / 40.009 40 / 39.961 25 / 9 0 / -39 6.3 ISO 2338 50 50.025 / 50.009 50 / 49.961 25 / 9 0 / -39 8 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - iTeh Standards: ISO 2338:1997 sample pages: Table 1 (d, c, nominal length with min / max), m6 / h8 classes, roughness, designation example (OCR; the extraction flagged its own c column as reconstructed) — web — Standards-body sample pages; numbers only — https://cdn.standards.iteh.ai/samples/20001/5b26cece48c448b782c0de1eccb5b16c/ISO-2338-1997.pdf - iTeh Standards: ISO 8734:1997 sample pages: d, c, nominal lengths 3 to 100 with min / max, m6, hardness ranges (OCR) — web — Standards-body sample pages; numbers only — https://cdn.standards.iteh.ai/samples/20002/ba95529de6a64437ac7454e14dbd2ef6/ISO-8734-1997.pdf - opac.net: ISO 2338 parallel pins data sheet: diameters 0.6 to 50, chamfer c, m6, length tolerances (cross-check) — web — Maker data sheet; numbers only — https://www.opac.net/pdf/ISO%202338.pdf - Westfield Fasteners: DIN 7 dowel pins: c max and r by d (0.8 to 50), length tolerances, m6 deviations by size band — web — Reference page; numbers only — https://westfieldfasteners.co.uk/Standards/Pin-Dowel.pdf - Emile Maurin: ISO tolerance sheet: shaft deviations h8 and m6 for the 0-3, 3-6, 6-10, 10-18, 18-30 and 30-50 mm bands — web — Maker sheet; numbers only — https://composants.emile-maurin.fr/custom/docs/modele/34-44_e/tolerance-generale-iso-tolerance-ldoc1.pdf - CAD Forum: ISO 286-2 shaft limit deviations table (h8, m6 by size band, from 3 mm) — web — Reference page; numbers only — https://www.cadforum.cz/en/tolerance.asp - Simply Bearings: ISO 286 limits and fits reference: shaft h8 and m6 for the 3-6 to 30-50 mm bands (cross-check) — web — Reference page; numbers only — https://simplybearings.co.uk/shop/Info-Pages-ISO-Limits/c4746_4779/index.html - ISO: ISO 8734:1987: Parallel pins, hardened (Dowel pins) (standard body catalogue page; the standard itself is paid) — web — Standard body catalogue page — https://www.iso.org/ics/21.060.50.html - MISUMI: Dowel pins, spring pins, stepped pins (configure a part and download 3D CAD from MISUMI) — web, CAD — Maker site terms; CAD per part from the maker [verify license at link] — https://us.misumi-ec.com/vona2/A0000000001/M1800000000/M1807000000 No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=dowel-pins-iso-2338-8734