Library › Hardware › Fasteners ·

Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size, hex key, thread length, M5 to M20

Name: Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size, hex key, thread length, M5 to M20 dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What are the dimensions of an ISO 7379 metric shoulder screw: shoulder diameter, thread, head diameter and height, hex key size and thread length? · Standard part · 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

Also called: iso 7379, shoulder bolt dimensions, shoulder screw dimensions metric, m6 shoulder bolt, m8 shoulder bolt 10mm, m5 shoulder screw 6mm, m10 shoulder bolt 13mm, shoulder bolt hex key size, shoulder screw thread length, iso 7379 m8, iso 7379 table, shoulder bolt step, shoulder bolt stl

Exact dimensions. True size, with no printing tolerance added.

sizes: 7 in table

Notes

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).

Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size… size chart

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

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

iTeh Standards	ISO 7379:1983 sample pages: shoulder d1, thread, head d, k, socket s, preferred lengths	web	Publisher's page; dimensions are facts
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
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
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
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
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
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
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

Free files

★ Free files 7 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

shoulder-screw-iso-7379-m5-shoulder-6x40	ISO 7379 shoulder screw M5: shoulder Ø6 × 40 mm long, thread M5 × 9.75 mm (drawn as a plain Ø5 cylinder, nominal major diameter), head Ø10 × 5, 3 mm hex socket 2.4 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL
shoulder-screw-iso-7379-m6-shoulder-8x40	ISO 7379 shoulder screw M6: shoulder Ø8 × 40 mm long, thread M6 × 11.25 mm (drawn as a plain Ø6 cylinder, nominal major diameter), head Ø13 × 6, 4 mm hex socket 3.3 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL
shoulder-screw-iso-7379-m8-shoulder-10x40	ISO 7379 shoulder screw M8: shoulder Ø10 × 40 mm long, thread M8 × 13.25 mm (drawn as a plain Ø8 cylinder, nominal major diameter), head Ø16 × 8, 5 mm hex socket 4.2 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL
shoulder-screw-iso-7379-m10-shoulder-13x40	ISO 7379 shoulder screw M10: shoulder Ø13 × 40 mm long, thread M10 × 16.4 mm (drawn as a plain Ø10 cylinder, nominal major diameter), head Ø18 × 10, 6 mm hex socket 4.9 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL
shoulder-screw-iso-7379-m12-shoulder-16x40	ISO 7379 shoulder screw M12: shoulder Ø16 × 40 mm long, thread M12 × 18.4 mm (drawn as a plain Ø12 cylinder, nominal major diameter), head Ø24 × 12, 8 mm hex socket 6.6 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL
shoulder-screw-iso-7379-m16-shoulder-20x40	ISO 7379 shoulder screw M16: shoulder Ø20 × 40 mm long, thread M16 × 22.4 mm (drawn as a plain Ø16 cylinder, nominal major diameter), head Ø30 × 16, 10 mm hex socket 8.8 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL
shoulder-screw-iso-7379-m20-shoulder-25x50	ISO 7379 shoulder screw M20: shoulder Ø25 × 50 mm long, thread M20 × 27.4 mm (drawn as a plain Ø20 cylinder, nominal major diameter), head Ø36 × 20, 12 mm hex socket 10 mm deep; the 50 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck	STEP · STL

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=shoulder-screws-iso-7379