Hydraulic quick couplers: ISO 16028 flat-face and ISO 7241-A / B plug diameters (J) by size, 1/4 to 1 in — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/hydraulic-quick-couplers-iso-16028-iso-7241/ (sheet CC BY 4.0) Basis: OMFB's quick-coupling tables (J), Stucchi's flat face A / FIRG / FL / FIRG Q tables (J), Flowfit's ISO 16028 table (Ød) and Parker's WK-MK112 catalog (series and threads); numbers only Catalog version: 2026-10-20 Sizes: see table below - Quick-coupler families: ISO 16028 is the flat-face coupling (the 'flush face' coupler on skid-steer and ag hydraulics: a flat plug nose, no poppet to trap dirt); ISO 7241 (parts 1 and 2; series A and B) is the ball-lock poppet coupling; the numbers here are the male plug (nipple) body diameter that the coupler's ball lock grips, because that is the interface diameter a designer needs. Plug diameter is the letter J in OMFB's and Stucchi's tables (OMFB's text explains only J, as 'male Ø for ball-lock types'; Stucchi's sheet does not define its letters) and Ød on male rows in Flowfit's table (letters not defined there). The three sources agree on the same plug diameters (within 0.05 mm: 16.1 / 16.15, 19.7 / 19.75, 24.5, 27, 30 / 29.95, 36), so J and Ød are the same dimension. - ISO 16028 rows: 1/4 in (ISO size 6.3) 16.1 mm, 3/8 in (10) 19.7, 1/2 in (12.5) 24.5, 5/8 in (16) 27.0, 3/4 in (19) 30.0, 1 in (25) 36.0 (Stucchi's Flat Face 'A' series, whose sheet says it is in accordance with ISO 16028). Sizes 1/8 (11.6), 1 1/4 (44.0), 1 1/2 (57.0) and 2 in (73.0) are in Stucchi's tables with no ISO size printed, and are not claimed as ISO 16028 sizes here. Naming differs by maker: Stucchi calls the 3/4 in size ISO size 19, OMFB's dash 12 is DN 20 and Flowfit's is DN 19; the plug diameter is the same (30 / 29.95 mm). OMFB's note says only the G 1/2 size of one series is compatible with ISO 7241-A. - ISO 7241 rows: J from OMFB's MB series A and B tables (and Stucchi's BIR series for A, which prints the same J for dash 06 to 20). The page prints no J for ISO 7241 in other makers' series, and no ISO 7241 plug groove, lanyard groove, overall length or hex values (only 'HEX. B / C' as drawn). Parker's WK-MK112 catalog lists its 60 series (ISO 7241 series B), 6600 series (ISO 7241 series A) and FEM / FEC series (ISO 16028) body sizes 1/8 to 1 in with NPT, ORB (SAE O-ring boss) and BSPP threads but no interface dimensions, so it is cited for what threads each series comes in, not for diameters. - Left out, no file: a plug body is not just a diameter: the ball-lock groove, the poppet or flat-face nose, and the lengths are drawn in the standard and in makers' dimensioned drawings, none of which came through as numbers; an invented plug would not be a standard part. The tables give the diameters to bore a socket or a hole around. Overall lengths per maker series (Stucchi B to I letters, OMFB B to F, Flowfit C) are published by the makers and not mixed here because their letters are undefined and the series differ. - Not the same as air couplers: for pneumatic plug profiles (industrial M / H / G, Tru-Flate, ARO, European) see air-quick-coupler-plug-profiles; for cam-and-groove hose couplings see camlock-couplings. McMaster-Carr sells ISO A series (ISO 7241-A) hydraulic couplings with per-part STEP; its category page is linked, not copied. Stucchi, OMFB, Parker and Flowfit catalogs are linked as the maker sources. standard size ISO size / DN plug Ø J (Stucchi Flat Face A, mm) Flowfit Ød (mm) OMFB J (mm) ISO 16028 flat face 1/8 in — 11.6 — — ISO 16028 flat face 1/4 in 6.3 16.1 16.15 (DN 6.3) — ISO 16028 flat face 3/8 in 10.0 19.7 19.75 (DN 10) 19.7 (dash 06, DN 10: Stucchi FIRG, DNP PLT1, Faster FFH, MB F) ISO 16028 flat face 1/2 in 12.5 24.5 24.5 (DN 12.5) 24.5 (dash 08, DN 12.5) ISO 16028 flat face 5/8 in 16.0 27.0 27 (DN 16) 27 (dash 10, DN 16) ISO 16028 flat face 3/4 in 19.0 30.0 29.95 (DN 19) 30 (dash 12, DN 20) ISO 16028 flat face 1 in 25.0 36.0 36 (DN 25) 36 (dash 16, DN 25) ISO 16028 flat face 1 1/4 in — 44.0 — — ISO 16028 flat face 1 1/2 in — 57.0 — 57 (dash 24, DN 37.5: Stucchi FIRG) ISO 16028 flat face 2 in — 73.0 — — ISO 7241-1 A (OMFB MB series A; Stucchi BIR) 3/8 in (dash 06) 10 mm 17.3 — — ISO 7241-1 A 1/2 in (dash 08) 12.5 mm 20.5 — — ISO 7241-1 A 3/4 in (dash 12) 20 mm 29.1 — — ISO 7241-1 A 1 in (dash 16) 25 mm 34.3 — — ISO 7241-1 A 1 1/4 in (dash 20) 31.5 mm 45 — — ISO 7241-1 A 1 1/2 in (dash 24) 37.5 mm 55 (OMFB MB A only) — — ISO 7241-1 B (OMFB MB series B) 3/8 in (dash 06) 10 mm 19.1 — — ISO 7241-1 B 1/2 in (dash 08) 12.5 mm 23.5 — — ISO 7241-1 B 3/4 in (dash 12) 20 mm 31.4 — — ISO 7241-1 B 1 in (dash 16) 25 mm 37.7 — — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - OMFB (quick couplings catalogue): MB series A / B (ISO 7241-1) and ISO 16028 flat face: dash, DN, thread, pressure, J, B to F (and Stucchi, DNP, Faster, MB F series tables) — web — Maker catalogue; numbers only. Only J is defined in the text — https://www.omfb.com/catalog/media/ARXIVAR_WEB/99711900010.pdf - Stucchi (quick disconnect catalog, hosted by Hydraquip): Flat face A, FIRG, FL and FIRG Q series (ISO 16028): body size, port, B to J, ISO size, weight — web — Maker catalogue; numbers only. The letters are not defined in the text; B and C are drawn as hex sizes — https://www.hydraquip.com/wp-content/uploads/2018/02/stucchi-quick-disconnect-catalog.pdf - Flowfit: ISO 16028 flat face couplings (carbon steel, metric): DN, PN, ØA, C, Ød, ch, ØM — web — Maker catalogue; numbers only. The page does not define its letters — https://www.flowfitonline.com/uploads/PDFproducts/03-10-flat-face-21-6.pdf - Parker (Hydraulic quick coupler catalog WK-MK112): 60 Series ISO 7241 series B, 6600 Series ISO 7241 series A, FEM / FEC ISO 16028: body sizes and threads — web — Maker catalogue; numbers only — https://www.parker.com/content/dam/Parker-com/Literature/Canada/Canada-Support-Assets/WK-MK112-Hydraulic-Quick-Coupler-Sept-2017.pdf - McMaster-Carr: ISO A series couplings (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/iso-a-series-couplings 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=hydraulic-quick-couplers-iso-16028-iso-7241