Ball knobs, DIN 319 (plastic), Ø16–50: thread M4–M12, neck diameter d4, height h and thread depth — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/ball-knobs-din-319/ (sheet CC BY 4.0) Basis: Halder's DIN 319 ball knob catalog page (form C with moulded thread and form E with threaded bush, Ø16 to 50); Ganter's DIN 319 datasheet as a cross-check; numbers only Catalog version: 2026-10-20 Sizes: see table below - Halder's table (plastic ball knobs, mm): d1 ball diameter, d2 thread, d4 ≈ and h ≈ (both marked approximate on the page) and the minimum thread depth, t1 for form C (moulded-in thread) and t2 for form E (threaded bush); the page does not define t1, t2 or d4 in text. The page lists each size in black and in red with identical dimensions, so one row per size is shown. The Ø16 form E has a brass bush (page footnote). Only 24 of the page's 30 listed rows were read, and form M (taper bore) did not appear in them, so those variants are not covered. - Ganter's DIN 319 datasheet sample rows (Ø16 with M4, Ø20 M5, Ø25 M6, Ø32 M8, Ø40 M10) show d4 8, 12, 15, 18, 22 and h 15, 18, 22.5, 29, 37, which match the Halder figures; the datasheet text has more values per row than headers, so its depth columns are not used and the Halder depth figures are the ones shown. Ganter's page also lists steel, aluminum and stainless ball knobs, and says these are 'not on the official DIN standard sheet'. Types there: C tapped hole, E tapped bush, K plain hole H7, L tolerance ring (press-on), M tapped bore (press-on). - DIN 319 is a ball knob; the DIN 6336 star knob and DIN 39 fixed handle are separate pages. No file: the ball is a sphere of Ø d1 with a flat and a neck whose profile is not given as numbers in the sources read (d4 and h are approximate). McMaster-Carr sells threaded ball knobs with per-part STEP; linked, not copied. d1 (ball Ø) d2 thread d4 ≈ h ≈ t1 min (form C) t2 min (form E) 16 M4 ~8 ~15 7 6 20 M5 ~12 ~18 9 7.5 25 M6 ~15 ~22.5 11 9 32 M8 ~18 ~29 14 12 40 M10 ~22 ~37 18 15 50 M12 ~28 ~46 21 18 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Halder: DIN 319 ball knobs (plastic), form C (moulded thread) and form E (threaded bush): d1, d2, d4 ≈, h ≈, t1 / t2 min; Ø16 to 50 (24 of 30 listed rows read) — web — Maker catalog page; numbers only. d4 and h are approximate (~) on the page — https://halder.com/PM/Standard-Parts/Operating-Elements/Thumb-Knobs/Ball-Knobs-DIN-319 - Elesa+Ganter: DIN 319 ball knobs datasheet (types C, E, K, L, M; KU / KT / ST / AL / NI): sample rows d1, d2, d3, d4, h, t1, t2 — web — Maker datasheet; used as a cross-check only (column alignment unclear in the text) — https://elesa-ganter.be/technicaldatasheet/DIN 319.pdf/en - McMaster-Carr: Metric ball knobs (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/metric-ball-knobs/ - McMaster-Carr: Threaded ball knobs (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/threaded-ball-knobs 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=ball-knobs-din-319