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Hexalobular (Torx) socket screws: ISO 14579 cap, ISO 14580 low cheese and ISO 14583 pan head, M2–M20: head diameter, height, socket number, depth + head envelopes

What are the head diameter, head height and Torx size of an ISO 14579, 14580 or 14583 hexalobular socket screw (M3, M4, M5, M6, M8)? · Standard part · basis: fasten.it tables for ISO 14579, 14580 and 14583 cross-checked against Aspen Fasteners (ISO 14579) and Westfield Fasteners (ISO 14580 and 14583), which agree with fasten.it on every value read; 15 head-envelope models as files

Also called: iso 14579 dimensions, m5 torx screw head diameter, m4 torx button head screw size, iso 14583 m3 pan head torx, torx screw head height m6, hexalobular socket head cap screw dimensions, iso 14580 low head torx, m3 torx screw t10, iso 14579 m8 socket size, torx cap screw head diameter, m6 torx screw t30, torx screw counterbore size, iso 14583 dimensions

Exact dimensions. True size, with no tolerance added.

length
16.0 mm
width
16.0 mm
height
36.0 mm

Notes

  • Millimetres. ISO 14579 is the hexalobular socket head cap screw (like ISO 4762 with a hexalobular socket), M2 to M20, product grade A, with a plain and a knurled head diameter; ISO 14580 is the hexalobular socket cheese head screw with reduced head, M2 to M10; ISO 14583 is the hexalobular socket pan head screw, M2 to M10. Columns: dk head diameter and k head height (nominal = max, with min where Westfield prints it), socket number (the ISO 10664 hexalobular size, T-number), A and t (socket depth min / max). 'A ref' is the across-lobes figure of the socket; for socket 45 the screw tables print 7.95 mm and the ISO 10664:2014 sample prints 7.93 mm (see torx-hexalobular-drive-sizes-iso-10664).
  • The last column carries the other numbers each source prints, with the source's own letters: for ISO 14579 b (a 16–52 value rising with size; the page does not define it) and w min (fasten.it); for ISO 14580 and 14583 a max, b min, da max, r min, w min (14580), rf (14583, equal to fasten.it's 'r ≈') and x max (Westfield). Neither source defines these letters in words. Units are not printed on Westfield's sheets; the values match fasten.it's mm tables.
  • Aspen's ISO 14579 sheet uses its own labels (D, P, B, D1, K, drive size, A) and prints the same numbers as fasten.it for b, dk, k and A for every size M2 to M20. fasten.it's ISO 14580 and 14583 tables also match Westfield's for dk, k, socket number, A and t for every size M2 to M10 with one exception: ISO 14580 M6 t max is 2.29 on fasten.it and 2.26 on Westfield (this page shows 2.26 with the difference noted in the row; fasten.it prints t min / max in a different column order for 14583).
  • Files are Xem-drawn head envelopes, not the real screw: a plain cylinder of diameter dk max and height k max on a plain shank at the nominal diameter (the thread is smaller at the root), M3 × 12, M4 × 16, M5 × 20, M6 × 25 and M8 × 30 mm under the head for each of the three standards. No hexalobular socket (its contour is not published as numbers in the pages read), no chamfer, no dome on the pan head (rf and r are listed only as references), no thread, no point. The example lengths are Xem's choices (they are in the length list fasten.it prints for ISO 14579; lengths for 14580 and 14583 were not read).
  • Not on this page: countersunk (ISO 14581, 14584) and tapping (ISO 14585) hexalobular screws, which exist but were not tabulated. Hex socket versions: socket-head-cap-screws-metric; pan and cheese head Phillips: machine-screws-metric-pan-cheese-csk.

Hexalobular (Torx) socket screws: ISO 14579 cap, ISO 14580 low… size chart

standardthreadpitchdk maxdk mink maxk minsocket no. (T size)At mint maxother numbers as printed (source's letters)
ISO 14579 capM20.43.8—2—61.750.710.84b 16; w min 0.55; knurled dk max 3.98
ISO 14579 capM2.50.454.5—2.5—82.40.911.04b 17; w min 0.85; knurled dk max 4.68
ISO 14579 capM30.55.5—3—102.81.011.27b 18; w min 1.15; knurled dk max 5.68
ISO 14579 capM40.77—4—203.951.421.8b 20; w min 1.4; knurled dk max 7.22
ISO 14579 capM50.88.5—5—254.51.652.03b 22; w min 1.9; knurled dk max 8.72
ISO 14579 capM6110—6—305.62.022.42b 24; w min 2.3; knurled dk max 10.22
ISO 14579 capM81.2513—8—457.952.923.31b 28; w min 3.3; knurled dk max 13.27
ISO 14579 capM101.516—10—508.953.624.02b 32; w min 4; knurled dk max 16.27
ISO 14579 capM121.7518—12—5511.354.825.21b 36; w min 4.8; knurled dk max 18.27
ISO 14579 capM14221—14—6013.455.625.99b 40; w min 5.8; knurled dk max 21.33
ISO 14579 capM16224—16—7015.76.627.01b 44; w min 6.8; knurled dk max 24.33
ISO 14579 capM182.527—18—8017.757.58b 48; w min 7.8; knurled dk max 27.33
ISO 14579 capM202.530—20—9020.28.699.2b 52; w min 8.6; knurled dk max 30.33
ISO 14580 low cheeseM20.43.83.621.551.4161.750.710.84a max 0.8; b min 25; da max 2.6; r min 0.1; w min 0.5; x max 1.0
ISO 14580 low cheeseM2.50.454.54.321.851.7182.40.780.91a max 0.9; b min 25; da max 3.1; r min 0.1; w min 0.7; x max 1.1
ISO 14580 low cheeseM30.55.55.322.42.26102.81.011.27a max 1; b min 25; da max 3.6; r min 0.1; w min 0.75; x max 1.25
ISO 14580 low cheeseM3.50.665.822.62.46153.351.071.33a max 1.2; b min 38; da max 4.1; r min 0.1; w min 1.0; x max 1.5
ISO 14580 low cheeseM40.776.783.12.92203.951.271.66a max 1.4; b min 38; da max 4.7; r min 0.2; w min 1.1; x max 1.75
ISO 14580 low cheeseM50.88.58.283.653.47254.51.521.91a max 1.6; b min 38; da max 5.7; r min 0.2; w min 1.3; x max 2.0
ISO 14580 low cheeseM61109.784.44.1305.61.92.26a max 2; b min 38; da max 6.8; r min 0.25; w min 1.6; x max 2.5; fasten.it prints t max 2.29 for M6 against Westfield's 2.26 (Westfield's value shown)
ISO 14580 low cheeseM81.251312.735.85.5457.952.663.05a max 2.5; b min 38; da max 9.2; r min 0.4; w min 2.0; x max 3.2
ISO 14580 low cheeseM101.51615.736.96.54508.953.043.43a max 3; b min 38; da max 11.2; r min 0.4; w min 2.4; x max 3.8
ISO 14583 panM20.443.71.61.4661.750.630.77a max 0.8; b min 25; da max 2.6; r min 0.1; rf 3.2; x max 1.0
ISO 14583 panM2.50.4554.72.11.9682.40.911.04a max 0.9; b min 25; da max 3.1; r min 0.1; rf 4; x max 1.1
ISO 14583 panM30.55.65.32.42.26102.81.011.27a max 1; b min 25; da max 3.6; r min 0.1; rf 5; x max 1.25
ISO 14583 panM3.50.676.642.62.46153.351.071.33a max 1.2; b min 38; da max 4.1; r min 0.1; rf 6; x max 1.5
ISO 14583 panM40.787.643.12.92203.951.271.66a max 1.4; b min 38; da max 4.7; r min 0.2; rf 6.5; x max 1.75
ISO 14583 panM50.89.59.143.73.52254.51.521.91a max 1.6; b min 38; da max 5.7; r min 0.2; rf 8; x max 2.0
ISO 14583 panM611211.574.64.3305.62.022.42a max 2; b min 38; da max 6.8; r min 0.25; rf 10; x max 2.5
ISO 14583 panM81.251615.5765.7457.952.793.18a max 2.5; b min 38; da max 9.2; r min 0.4; rf 13; x max 3.2
ISO 14583 panM101.52019.487.57.14508.953.624.02a max 3; b min 38; da max 11.2; r min 0.4; rf 16; x max 3.8

Where the files are

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

fasten.itDIN EN ISO 14579 hexalobular socket head cap screws M2 to M20 (grade A): b, dk (plain and knurled), k, w, socket no., A, t; lengths per size, 06/2011webReference page; numbers only. Pitch, b and A are not marked max or min
Aspen FastenersMetric ISO 14579 spec: D, P, B, D1, K, 6-lobe drive size, A for M2 to M20 (labels as printed; agrees with fasten.it)webMaker spec sheet; numbers only
fasten.itDIN EN ISO 14580 hexalobular socket cheese head screws with reduced head M2 to M10: P, dk, k, w, socket no., A, t, 2011webReference page; numbers only. dk and k are nominal = max
Westfield FastenersScrewBolt TXCapLow14580: ISO 14580 d, p, a, b, dk (max, min), da, k (max, min), r, w, x, socket no., A, t (max, min), M2 to M10webMaker / stockist standards sheet; numbers only. Units are not stated, mm by the neighbouring shank-length table
fasten.itDIN EN ISO 14583 hexalobular socket pan head screws M2 to M10 (grade A): P, dk, k, r, socket no., A, t, 2011webReference page; numbers only. dk and k are nominal = max
Westfield FastenersScrewBolt TXPan14583: ISO 14583 d, p, a, b, da, dk (max, min), k (max, min), r, rf, x, socket no., A, t (max, min), M2 to M10webMaker / stockist standards sheet; numbers only
McMaster-CarrTamper-resistant (pin-in) Torx bits, T7 to T55 (free STEP/IGES per part, for your own design use; no redistribution)STEP, IGES, PDFMcMaster-Carr site terms: personal design use, no redistribution verify

Free files

★ Free files 15 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

iso-14579-m3x12-head-envelopeISO 14579 M3 head envelope: plain cylinder Ø5.5 × 3 mm (dk max × k max) on a plain Ø3 shank, example length 12 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14579-m4x16-head-envelopeISO 14579 M4 head envelope: plain cylinder Ø7 × 4 mm (dk max × k max) on a plain Ø4 shank, example length 16 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14579-m5x20-head-envelopeISO 14579 M5 head envelope: plain cylinder Ø8.5 × 5 mm (dk max × k max) on a plain Ø5 shank, example length 20 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14579-m6x25-head-envelopeISO 14579 M6 head envelope: plain cylinder Ø10 × 6 mm (dk max × k max) on a plain Ø6 shank, example length 25 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14579-m8x30-head-envelopeISO 14579 M8 head envelope: plain cylinder Ø13 × 8 mm (dk max × k max) on a plain Ø8 shank, example length 30 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14580-m3x12-head-envelopeISO 14580 M3 head envelope: plain cylinder Ø5.5 × 2.4 mm (dk max × k max) on a plain Ø3 shank, example length 12 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14580-m4x16-head-envelopeISO 14580 M4 head envelope: plain cylinder Ø7 × 3.1 mm (dk max × k max) on a plain Ø4 shank, example length 16 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14580-m5x20-head-envelopeISO 14580 M5 head envelope: plain cylinder Ø8.5 × 3.65 mm (dk max × k max) on a plain Ø5 shank, example length 20 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14580-m6x25-head-envelopeISO 14580 M6 head envelope: plain cylinder Ø10 × 4.4 mm (dk max × k max) on a plain Ø6 shank, example length 25 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14580-m8x30-head-envelopeISO 14580 M8 head envelope: plain cylinder Ø13 × 5.8 mm (dk max × k max) on a plain Ø8 shank, example length 30 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14583-m3x12-head-envelopeISO 14583 M3 head envelope: plain cylinder Ø5.6 × 2.4 mm (dk max × k max) on a plain Ø3 shank, example length 12 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14583-m4x16-head-envelopeISO 14583 M4 head envelope: plain cylinder Ø8 × 3.1 mm (dk max × k max) on a plain Ø4 shank, example length 16 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14583-m5x20-head-envelopeISO 14583 M5 head envelope: plain cylinder Ø9.5 × 3.7 mm (dk max × k max) on a plain Ø5 shank, example length 20 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14583-m6x25-head-envelopeISO 14583 M6 head envelope: plain cylinder Ø12 × 4.6 mm (dk max × k max) on a plain Ø6 shank, example length 25 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · STL
iso-14583-m8x30-head-envelopeISO 14583 M8 head envelope: plain cylinder Ø16 × 6 mm (dk max × k max) on a plain Ø8 shank, example length 30 mm under the head (Xem's choice); no hexalobular socket, chamfer, dome or threadSTEP · 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.
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Plain text: sheet.txt · JSON: /api/geometry?object=hexalobular-socket-screws-iso-14579-14580-14583

Hexalobular (Torx) socket screws: ISO 14579 cap, ISO 14580 low cheese and ISO 14583 pan head, M2–M20: head diameter, height, socket number, depth + head envelopes, isometric render of a generated part
Render of iso-14580-m5x20-head-envelope from the free STEP; not to scale.

Fits with

length
Torx / hexalobular drive sizes T1–T100 (ISO 10664): A and B across lobes, gauge limits for A, B, Ri, Re and depth H, and the screw size each fits24 sizes★ sheet
Socket head cap screws, M2–M8 (ISO 4762 / DIN 912), isometric render of a generated part
Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)7 sizes★ 47 files
Metric machine screws M1.6–M10: pan head ISO 7045 (cross) / ISO 1580 (slotted), cheese head ISO 1207, countersunk ISO 7046-1 — head sizes, recess sizes + models, isometric render of a generated part
Metric machine screws M1.6–M10: pan head ISO 7045 (cross) / ISO 1580 (slotted), cheese head ISO 1207, countersunk ISO 7046-1 — head sizes, recess sizes + models37.5×20.0×37.5 mm★ 36 files
Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991), isometric render of a generated part
Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991)7 sizes★ 35 files
Button head socket screws, M2–M8 (ISO 7380), isometric render of a generated part
Button head socket screws, M2–M8 (ISO 7380)7 sizes★ 35 files
length
Self-tapping (sheet metal) screws: ISO 7049 pan head ST2.2–ST6.3 and ASME B18.6.4 Type AB thread #2 to 3/820 sizes★ sheet

Questions

What is the head diameter of an M5 ISO 14579 Torx cap screw?

8.5 mm max and 5 mm high, with socket number 25 (T25), A 4.5 mm and socket depth 1.65 to 2.03 mm (fasten.it and Aspen).

What Torx size does an M4 pan head ISO 14583 screw use?

Socket 20 (T20), A 3.95 mm; head dk 8 mm max (7.64 min), height 3.1 mm max (2.92 min); socket depth 1.27 to 1.66 mm (Westfield; fasten.it agrees).

Is an ISO 14580 head lower than an ISO 14579 head?

Yes. For M6, ISO 14580 is 10 mm across and 4.4 mm high; ISO 14579 is 10 mm across and 6 mm high.