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Hex Head Screw Plug Dimensions (DIN 910, M10x1 to M52, G1/8 to G2)
Guide · Updated October 28, 2026
DIN 910 covers heavy hexagon head screw plugs with collar and parallel thread, from M10x1 to M52 and G1/8 to G2. Values agree across fasten.it, Daniel Gruppe, Vipa Fasteners and Ferrobend. Check your supplier for critical work.
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Step by step
- Identify the thread: DIN 910 comes in metric fine (DIN 13) and G pipe thread (ISO 228-1); check pitch before ordering.
- Check clearance: The hex head needs wrench room above the port; check l and s.
- Pick the wrench: Use a socket or ring spanner of size s; the head is m high.
- Seal it: Fit a DIN 7603 ring or bonded seal under the collar; parallel thread does not seal.
DIN 910 hex head screw plug dimensions (mm)
Columns: thread d1 (metric fine and/or G), collar diameter d2, collar height c, thread length i, overall length l, width across flats s, width across corners e min, head height m.
- Size | d2 | c | i | l | s | e | m
- M10x1 / G1/8 | 14 | 3 | 8 | 17 | 10 | 10.89 | 6
- M12x1.5 | 17 | 3 | 12 | 21 | 13 | 14.2 | 6
- G1/4 | 18 | 3 | 12 | 21 | 13 | 14.2 | 6
- M14x1.5 | 19 | 3 | 12 | 21 | 13 | 14.2 | 6
- M16x1.5 | 21 | 3 | 12 | 21 | 17 | 18.72 | 6
- G3/8 | 22 | 3 | 12 | 21 | 17 | 18.72 | 6
- M18x1.5 | 23 | 4 | 12 | 24 | 17 | 18.72 | 8
- M20x1.5 | 25 | 4 | 14 | 26 | 19 | 20.88 | 8
- G1/2 | 26 | 4 | 14 | 26 | 19 | 20.88 | 8
- M22x1.5 | 27 | 4 | 14 | 26 | 19 | 20.88 | 8
- M24x1.5 | 29 | 4 | 14 | 27 | 22 | 23.91 | 9
- M26x1.5 | 31 | 4 | 16 | 30 | 24 | 26.17 | 10
- M27x2 / G3/4 | 32 | 4 | 16 | 30 | 24 | 26.17 | 10
- M30x1.5 / M30x2 | 36 | 4 | 16 | 30 | 24 | 26.17 | 10
- M33x2 / G1 | 39 | 5 | 16 | 32 | 27 | 29.56 | 11
- M36x1.5 / M36x2 | 42 | 5 | 16 | 32 | 27 | 29.56 | 11
- M38x1.5 / G1 1/8 | 44 | 5 | 16 | 32 | 27 | 29.56 | 11
- M42x1.5 / G1 1/4 | 49 | 5 | 16 | 33 | 30 | 32.95 | 12
- M45x1.5 | 52 | 5 | 16 | 33 | 30 | 32.95 | 12
- M48x1.5 / G1 1/2 | 55 | 5 | 16 | 33 | 30 | 32.95 | 12
- M52x1.5 / M52x2 | 60 | 5 | 16 | — | 30 | — | 12
- G1 3/4 | 62 | 5 | — | 40 | 36 | 39.55 | 15
- G2 | 68 | 5 | 20 | 40 | — | 39.55 | 15
Worked example: M20x1.5 plug
An M20x1.5 DIN 910 plug has a 25 mm collar, 4 mm thick, 14 mm of thread and is 26 mm long overall. It takes a 19 mm spanner on an 8 mm high head.
Common problems
- Leaks at the collar: missing or reused crush washer, or a damaged seat face.
- No wrench room: the hex head stands l above the face; switch to a DIN 908 socket plug.
- Rounded hex: an open-end spanner on a tight plug; use a 6-point socket of size s.
FAQ
What is DIN 910?
A heavy screw plug with collar and external hex head, parallel thread, used on gearbox, hydraulic and oil ports.
How is it different from DIN 908?
DIN 908 has a hex socket and sits nearly flush; DIN 910 has an external hex head for a spanner.
Why are some values majority values?
One table gives s 17 at M14x1.5, m 8 at M16x1.5 and G3/8, and another gives s 17 at G1/2; three sources agree on 13, 6 and 19, so we use those.
Why is e 26.17 at M30?
One sheet shows 29.17, a typo; the hex is 24 like M26 and M27, and the other source gives 26.17.
Why are some cells dashed?
G1 3/4 i conflicts (16 vs 20), G2 s and M52 l and e appear in only one source. M56 to M64 are left out for the same reason.
Related guides and calculators
- Sealing rings (DIN 7603)
- Light screw plugs (DIN 7604)
- Socket screw plugs (DIN 908)
- Pipe nuts (DIN 431)
- Wrench size chart
- All free machinist calculators
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