Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size, hex key, thread length, M5 to M20 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/shoulder-screws-iso-7379/ (sheet CC BY 4.0) Basis: ISO 7379:1983 sample pages, fasten.it, Ganter Norm and McMaster part mirrors; disagreements are listed rather than averaged; McMaster-Carr linked for CAD Catalog version: 2026-10-20 Sizes: see table below - ISO 7379 is the hexagon socket head shoulder screw: a hardened, ground shoulder of diameter d1 that acts as a bearing surface or pivot, then a shorter thread. The shoulder length l1 is the dimension you choose; thread size, head and key are fixed per shoulder diameter. Pitches are ISO coarse. Preferred l1 in the 1983 edition: 10, 12, 16, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 120 mm; shoulder tolerance f9 or h8 depending on the supplier. - Where sources agree: head diameter and hex key size for all seven sizes (ISO 7379:1983 sample, fasten.it, Ganter Norm); shoulder diameter for M6, M8, M12 and M16 (8, 10, 16, 20); McMaster-Carr part mirrors match the 1983 sample for M5 (6 mm shoulder, head 10 × 5, 3 mm key) and M10 (13 mm shoulder, 10 mm head height, 6 mm key). - Where sources disagree: shoulder diameter M5: 6 mm (ISO sample, Ganter, McMaster mirror) vs 6.5 mm (fasten.it); M10: 13 mm (ISO sample, fasten.it, McMaster mirror) vs 12 mm (Ganter, Accu Components); M20: 25 mm (ISO sample, fasten.it) vs 24 mm (Ganter). The table and files use the 1983 sample's values (6, 13, 25), the alternates are shown in brackets. Head height: the 1983 sample and the two McMaster mirrors give 5 (M5) and 10 (M10); fasten.it prints smaller maxima (4.5 to 16, in brackets); Accu lists 8.9 for M10; a Zoro M16 listing shows 14. M10 head diameter is 18 in the sample, fasten.it, Ganter and Accu but 19 on the McMaster mirror. If head height or the M10 / M5 / M20 shoulder matters, measure your part. - Thread length b is fasten.it's maximum (corroborated by Accu: 16.4 for M10; McMaster mirrors 10 for M5, 16 for M10; Zoro 22 for M16); the socket depth t is fasten.it's minimum and has no second source. Shoulder length ranges differ between fasten.it and Ganter, so both are shown; Ganter also lists M3 (4 mm shoulder) and M4 (5 mm), noted there as not in the official ISO sheet, which are not used. - Files: seven shoulder screws, one per thread size at an example shoulder length (40 mm; 50 mm for M20), as one revolved solid with a hex socket. The thread is a plain cylinder at the nominal major diameter over the thread length b; no real thread, thread neck, head chamfer or underhead radius, because the tables do not give them. Shoulder length is yours to choose; edit the model for another l1. - Inch shoulder screws (ASME B18.3) are on the companion page. McMaster-Carr's shoulder screw category with an ISO 7379 filter is linked below (free per-part STEP/IGES there; not hosted here). thread d2 pitch P, mm shoulder Ø d1, mm (other sources) head Ø d3 (max), mm head height k, mm (fasten.it k max) hex key s, mm thread length b (max), mm socket depth t (min), mm shoulder length l1 range, mm (fasten.it / Ganter) M5 0.8 6 (fasten.it 6.5) 10 5 (4.5) 3 9.75 2.4 10–40 / 10–80 M6 1 8 13 6 (5.5) 4 11.25 3.3 12–50 / 16–100 M8 1.25 10 16 8 (7) 5 13.25 4.2 16–120 / 16–100 M10 1.5 13 (Ganter 12) 18 10 (9) 6 16.4 4.9 16–120 / 16–100 M12 1.75 16 24 12 (11) 8 18.4 6.6 30–120 / 25–100 M16 2 20 30 16 (14) 10 22.4 8.8 40–120 / 30–100 M20 2.5 25 (Ganter 24) 36 20 (16) 12 27.4 10 50–120 / 50–100 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - iTeh Standards: ISO 7379:1983 sample pages: shoulder d1, thread, head d, k, socket s, preferred lengths — web — Publisher's page; dimensions are facts — https://cdn.standards.iteh.ai/samples/14078/66d6be2c979341abb895fa52330708be/ISO-7379-1983.pdf - fasten.it: ISO 7379 Standard dimensions for hexagon socket head shoulder screws (M5 to M20): thread length b max, socket depth t min, k max — web — Publisher's page; dimensions are facts — https://fasten.it/en/norms/norm/iso_7379 - Ganter Norm: ISO 7379 shoulder screws, steel, with collar: d1, d2, l1, d3, s (and the 4 / M3, 5 / M4 non-ISO sizes) — web — Publisher's page; dimensions are facts — https://ganternorm.com/en/products/3.2-Mounting-positioning-levelling-with-screws-clamping-and-supporting-elements/Swing-bolts-Shoulder-screws-Thrust-bolts/ISO-7379-Shoulder-screws - SKDIN (distributor, McMaster part mirror): M5 ISO 7379 shoulder screw 92981A149: 6 mm shoulder, head 10 x 5, socket 3 — web — Publisher's page; dimensions are facts — https://www.skdin.com/products/productid-0537FA00027 - SKDIN (distributor, McMaster part mirror): M10 ISO 7379 shoulder screw 90265A374: 13 mm shoulder, head 19 x 10 — web — Publisher's page; dimensions are facts — https://www.skdin.com/products/productid-0543FA00205 - Accu Components: M10 x 20 socket shoulder screw ISO 7379 (12 mm shoulder, 16.4 thread length, head 18 x 8.9) — web — Publisher's page; dimensions are facts — https://accu-components.com/us/metric-socket-shoulder-screws/10490-SSH-M10-20-12-9 - McMaster-Carr: Shoulder screws, ISO 7379 filter (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/shoulder-screws/specifications-met~iso-7379 - McMaster-Carr: Steel shoulder screws (inch and metric) (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/steel-shoulder-screws/ Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/shoulder-screws-iso-7379/index.json API: https://xemstudio.com/api/geometry?object=shoulder-screws-iso-7379