Low-head socket cap screws: DIN 7984 M3–M20 and DIN 6912 (pilot recess) M4–M36 — head diameter and height, hex socket, thread length + head envelope models — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/low-head-socket-cap-screws-din-7984-6912/ (sheet CC BY 4.0) Basis: Westfield Fasteners' DIN 7984 table (cross-checked against Ferrofast), fasten.it's DIN 6912 table (03-2021, Aspen Fasteners' table as a cross-check); seven DIN 7984 head envelopes as files Catalog version: 2026-10-20 Overall (mm): length 5.5, width 5.5, height 14.0 - DIN 7984 (hexagon socket cap screws with low head, M3 to M20 here; the page lists to M24) in mm, from Westfield: pitch P; minimum thread length b for screws up to 125 mm long (b is longer for screws over 125 mm; the Westfield table has two more rows for that, not tabulated here); head diameter dk max / min; head height k max / min; socket s (nominal, with min / max on the source page) and socket depth t nominal (min – max); also shank ds, bearing face dw min, key corner e min, transition da max, edge radius r min, lf max and v max. The loadability of the low head is lower (Westfield: typically about 80 % of a standard 10.9 screw's); no strength values are tabulated here. - Ferrofast's DIN 7984 table agrees with Westfield on dk, s, t and the other k values, but prints k max 6.5 for M10 (Westfield 6.0), alongside a k min of 5.82 which cannot go with 6.5, and a key size s max of 12.212 for M18 below its s min; those two entries are treated as errors and Westfield's values are used. fasten.it's DIN 6912 table prints k max 6.5 at M10, the same as Ferrofast's 7984 row; the DIN 7984 value could be the older figure. Use the edition your drawing cites. - DIN 6912 (low head, with pilot recess) in the 03-2021 edition on fasten.it, M4 to M36, mm: P; b for three length ranges (≤ 125, > 125 to 200, > 200); dk max; k max; s nominal (socket); e min; dh min (the page's letter, read from the pilot-recess description as the recess diameter; not defined there); t1 nominal and t2 min (not defined either: socket and recess depths). The page says the 06-2009 edition has identical values, and that these screws have a short unthreaded portion of shank to make up for the pilot recess and a reduced loadability. Aspen's DIN 6912 sheet agrees on dk, k, s and the t values, but prints a dk min of 65.61 for M24 and a ds min of 65.61 for M36 (clearly errors, not used) and says it was compiled from public sources. Sizes in brackets in some sources (M14, M18, M22, M27, M33) are non-preferred. - Files: DIN 7984 M3 to M12 head envelopes: a plain cylinder of diameter dk max and height k max with a flat-bottomed hex socket of the nominal s across flats and depth t nominal, on a plain shank at the nominal diameter. The length under the head is 4 × d (12 to 48 mm), Xem's example, not a published length. No thread, no head edge radius, no conical socket bottom. No DIN 6912 file: the pilot-recess dimensions (dh, t1, t2) are not defined in the sources read. - McMaster-Carr sells pilot-recess (DIN 6912) screws and low-head socket screws with per-part STEP; its DIN 6912 and pilot-recess pages are linked, not copied. Standard-height socket screws: socket-head-cap-screws-metric, socket-head-cap-screws-inch-full. standard / source size P (mm) b min (L ≤ 125) head dia dk (max / min) head height k (max / min) socket s (AF) socket depth t other columns as printed DIN 7984 (Westfield) M3 0.5 12 5.5 / 5.32 2.0 / 1.86 2 1.5 (1.38 – 1.62) ds 3 / 2.86; dw min 4.84; e min 2.3; da max 3.6; r min 0.1; lf max 0.51; v max 0.3 DIN 7984 (Westfield) M4 0.7 14 7 / 6.78 2.8 / 2.66 2.5 2.3 (2.18 – 2.42) ds 4 / 3.82; dw min 6.2; e min 2.87; da max 4.7; r min 0.2; lf max 0.6; v max 0.4 DIN 7984 (Westfield) M5 0.8 16 8.5 / 8.28 3.5 / 3.32 3 2.7 (2.58 – 2.82) ds 5 / 4.82; dw min 7.7; e min 3.44; da max 5.7; r min 0.2; lf max 0.6; v max 0.5 DIN 7984 (Westfield) M6 1 18 10 / 9.78 4.0 / 3.82 4 3 (2.88 – 3.12) ds 6 / 5.82; dw min 9.2; e min 4.58; da max 6.8; r min 0.25; lf max 0.68; v max 0.6 DIN 7984 (Westfield) M8 1.25 22 13 / 12.73 5.0 / 4.82 5 3.8 (3.65 – 3.95) ds 8 / 7.78; dw min 12.03; e min 5.72; da max 9.2; r min 0.4; lf max 1.02; v max 0.8 DIN 7984 (Westfield) M10 1.5 26 16 / 15.73 6.0 / 5.82 7 4.5 (4.35 – 4.65) ds 10 / 9.78; dw min 15.03; e min 8.01; da max 11.2; r min 0.4; lf max 1.02; v max 1.0 DIN 7984 (Westfield) M12 1.75 30 18 / 17.73 7 / 6.78 8 5 (4.85 – 5.15) ds 12 / 11.73; dw min 17.03; e min 9.15; da max 13.7; r min 0.6; lf max 1.87; v max 1.2 DIN 7984 (Westfield) M14 2 34 21 / 20.67 8 / 7.78 10 5.3 (5.15 – 5.45) ds 14 / 13.73; dw min 19.83; e min 11.43; da max 15.7; r min 0.6; lf max 1.87; v max 1.4 DIN 7984 (Westfield) M16 2 38 24 / 23.67 9 / 8.78 12 5.5 (5.35 – 5.65) ds 16 / 15.73; dw min 22.83; e min 13.72; da max 17.7; r min 0.6; lf max 1.87; v max 1.6 DIN 7984 (Westfield) M18 2.5 42 27 / 26.67 10 / 9.78 12 6.5 (6.32 – 6.68) ds 18 / 17.73; dw min 25.83; e min 13.72; da max 20.2; r min 0.6; lf max 1.87; v max 1.8 DIN 7984 (Westfield) M20 2.5 46 30 / 29.67 11 / 10.73 14 7.5 (7.32 – 7.68) ds 20 / 19.67; dw min 28.83; e min 16; da max 22.4; r min 0.8; lf max 2.04; v max 2.0 DIN 6912 pilot recess (fasten.it 03-2021) M4 0.7 14; >125: —; >200: — 7 (max) 2.8 (max) 3 t1 1.6; t2 min 3.3 e min 3.44; dh min 2 DIN 6912 pilot recess (fasten.it 03-2021) M5 0.8 16; >125: —; >200: — 8.5 (max) 3.5 (max) 4 t1 2; t2 min 4 e min 4.58; dh min 2.5 DIN 6912 pilot recess (fasten.it 03-2021) M6 1 18; >125: —; >200: — 10 (max) 4 (max) 5 t1 2.5; t2 min 5 e min 5.72; dh min 3 DIN 6912 pilot recess (fasten.it 03-2021) M8 1.25 22; >125: —; >200: — 13 (max) 5 (max) 6 t1 3; t2 min 6.5 e min 6.86; dh min 4 DIN 6912 pilot recess (fasten.it 03-2021) M10 1.5 26; >125: 32; >200: — 16 (max) 6.5 (max) 8 t1 3.5; t2 min 7.5 e min 9.15; dh min 5 DIN 6912 pilot recess (fasten.it 03-2021) M12 1.75 30; >125: 36; >200: — 18 (max) 7.5 (max) 10 t1 4; t2 min 9 e min 11.43; dh min 6 DIN 6912 pilot recess (fasten.it 03-2021) M14 2 34; >125: 40; >200: — 21 (max) 8.5 (max) 12 t1 4.5; t2 min 10 e min 13.72; dh min 7 DIN 6912 pilot recess (fasten.it 03-2021) M16 2 38; >125: 44; >200: 57 24 (max) 10 (max) 14 t1 5.5; t2 min 11.5 e min 16; dh min 8 DIN 6912 pilot recess (fasten.it 03-2021) M18 2.5 42; >125: 48; >200: 61 27 (max) 11 (max) 14 t1 6; t2 min 12.5 e min 16; dh min 8 DIN 6912 pilot recess (fasten.it 03-2021) M20 2.5 46; >125: 52; >200: 65 30 (max) 12 (max) 17 t1 6.5; t2 min 14 e min 19.44; dh min 10 DIN 6912 pilot recess (fasten.it 03-2021) M22 2.5 50; >125: 56; >200: 69 33 (max) 13 (max) 17 t1 7; t2 min 15 e min 19.44; dh min 10 DIN 6912 pilot recess (fasten.it 03-2021) M24 3 54; >125: 60; >200: 73 36 (max) 14 (max) 19 t1 7; t2 min 16 e min 21.73; dh min 12 DIN 6912 pilot recess (fasten.it 03-2021) M27 3 60; >125: 66; >200: 79 40 (max) 16 (max) 19 t1 8.5; t2 min 17 e min 21.73; dh min 12 DIN 6912 pilot recess (fasten.it 03-2021) M30 3.5 66; >125: 72; >200: 85 45 (max) 17.5 (max) 22 t1 9; t2 min 19 e min 25.15; dh min 15 DIN 6912 pilot recess (fasten.it 03-2021) M33 3.5 72; >125: 78; >200: 91 50 (max) 19.5 (max) 24 t1 10; t2 min 20 e min 27.43; dh min 16.5 DIN 6912 pilot recess (fasten.it 03-2021) M36 4 78; >125: 84; >200: 97 54 (max) 21.5 (max) 27 t1 11.5; t2 min 24 e min 30.85; dh min 18 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Westfield Fasteners: DIN 7984 hexagon socket cap screws with low head, M3 to M20: P, b, da, dk, ds, dw, e, k, lf, r, s, t, v (max / min) — web — Distributor reference; numbers only — https://westfieldfasteners.co.uk/Standards/ScrewBolt-SHCapLow-M.html - Ferrofast (DIN fasteners): DIN 7984 low head socket head cap screws: thread length b1, head diameter d2, head height k, key size s, key engagement t (min / max), M3 to M24 — web — Distributor reference; numbers only. Contains visible data errors (M10 k max / k min, M18 s) — https://din-fasteners.ferrobend.com/screws/din-7984 - fasten.it: DIN 6912 Low head socket cap screws with pilot recess (03-2021, supersedes 06-2009): d, P, b, dk max, k max, s nom, e min, dh min, t1 nom, t2 min, M4 to M36 — web — Reference page; numbers only — https://fasten.it/norms/norm/din_6912 - Aspen Fasteners: Metric DIN 6912 spec: P, b, dk, da, dh, ds, dw, e, lf, k, r, s, t1, t2, v, M4 to M36 (page notes that it was compiled from public sources and may contain errors) — web — Distributor data sheet; numbers only — https://www.aspenfasteners.com/content/pdf/Metric_DIN_6912_spec.pdf - McMaster-Carr: DIN 6912 pilot-recess socket 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/screws/specifications-met~din-6912 - McMaster-Carr: Pilot-recess 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/pilot-recess-screws Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/low-head-socket-cap-screws-din-7984-6912/index.json API: https://xemstudio.com/api/geometry?object=low-head-socket-cap-screws-din-7984-6912