Knurled thumb screws, low type (DIN 653), M1–M10: head diameter, head height, shank, nominal lengths + 6 models — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/thumb-screws-din-653-low-type/ (sheet CC BY 4.0) Basis: fasten.it's DIN 653 table (08/2006) and mass grid (nominal lengths) with Westfield Fasteners' table (dk nominal / max / min, k min, knurl pitch, shank limits); six envelope models as files Catalog version: 2026-10-20 Overall (mm): length 36.0, width 36.0, height 28.0 - Millimetres, M1 to M10. DIN 653 is the low type of the knurled thumb screw (DIN 464 is the high type: knurled-thumb-screws-din-464). Columns: pitch P, a1 max (neither source defines it), head diameter dk (nominal, with Westfield's max / min), shank diameter d max / min (Westfield's pair, from M2 up), head height k (nominal = max; Westfield also gives k min), top-edge radius r max, minimum knurl pitch, and the nominal length range from fasten.it's mass table. The lengths between the ends are not listed here (the mass grid was not reproduced). - The two sources agree on dk, P, a1 and r for every size. Their column letters differ: what fasten.it labels 'e' (e.g. 4 for M6) Westfield labels 'ds', and what fasten.it labels 'k max' (5 for M6) Westfield labels 'e nom = max' and also gives 'k min' (4.7). Neither source defines these letters; the table uses k (5 mm for M6, the value both sources print as the head height max / nominal), and the third dimension is left out. The page does not give a thread length b, a slot size or a knurl profile (none is printed), so none is shown. - Files: a plain head cylinder at dk (nominal) and k on a plain shank at the nominal thread diameter. Each is the shortest length in fasten.it's list for that size (an example, Xem's choice of the end of the range). No knurl, chamfer, edge radius or thread is modelled because none is published as numbers. - McMaster-Carr sells DIN 653 thumb screws with per-part STEP, and Halder (maker) has a data sheet; both linked, not copied. size pitch P (mm) a1 max (mm) head dk nominal (max / min) (mm) shank d max / min (mm, Westfield) head height k nominal = max / min (mm) r max (mm) knurl pitch min (mm) nominal lengths (mm, fasten.it) M1 0.25 0.75 5.5 (5.74 / 5.26) — 1.5 / 1.25 0.5 0.5 2 – 6 M1.2 0.25 0.75 6 (6.24 / 5.76) — 1.5 / 1.25 0.5 0.5 2 – 8 M1.4 0.3 0.9 7 (7.29 / 6.71) — 2 / 1.75 0.5 0.5 3 – 10 M1.6 0.35 1.05 7.5 (7.79 / 7.29) — 2 / 1.75 0.5 0.5 3 – 12 M2 0.4 1.2 9 (9.29 / 8.71) 2.00 / 1.86 2 / 1.75 0.5 0.5 4 – 16 M2.5 0.45 1.35 11 (11.35 / 10.65) 2.50 / 2.36 2.5 / 2.25 0.5 0.6 5 – 18 M3 0.5 1.5 12 (12.35 / 11.65) 3.00 / 2.86 2.5 / 2.25 0.5 0.6 6 – 20 M4 0.7 2.1 16 (16.35 / 15.65) 4.00 / 3.82 3.5 / 3.2 0.5 0.6 8 – 25 M5 0.8 2.4 20 (20.42 / 19.58) 5.00 / 4.82 4 / 3.7 1 0.6 10 – 30 M6 1 3 24 (24.42 / 23.58) 6.00 / 5.82 5 / 4.7 1 0.6 12 – 30 M8 1.25 3.75 30 (30.42 / 29.58) 8.00 / 7.78 6 / 5.7 2 0.6 16 – 35 M10 1.5 4.5 36 (36.5 / 35.5) 10.00 / 9.78 8 / 7.64 2 0.8 20 – 40 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - fasten.it: DIN 653 knurled thumb screws, low type, 08/2006: pitch, a1, dk, ds, e, k max, r; mass table with nominal lengths (M1 to M10) — web — Reference page; numbers only — https://fasten.it/en/norms/norm/din_653 - Westfield Fasteners: DIN 653 knurled thumb screws, low type: p, a max, c, dk nom / max / min, k min, r max, knurl pitch (M1 to M10) — web — Publisher's page; dimensions are facts — https://westfieldfasteners.co.uk/Standards/ScrewBolt-ThumbLow-M.html - McMaster-Carr: DIN 653 thumb screws (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/thumb-screws/specifications-met~din-653 - Halder (maker): DIN 653 knurled thumb screws, low type (maker data sheet / CAD) — web, PDF — Maker / distributor page; dimensions are facts [verify license at link] — https://halder.fr/en_fr/file-download/object_file_dsag_eh24770fr_en Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/index.json API: https://xemstudio.com/api/geometry?object=thumb-screws-din-653-low-type