DIN 917 Low Dome Nuts
DIN 917 covers low-form hexagon cap nuts — a shallower dome than DIN 1587, enclosing the bolt end where headroom is tight. We supply DIN 917 cap nuts in steel and stainless steel across a wide range of metric sizes.
DIN 917 dimensions
| Diameter | Pitch | Height | Across Flats | Min thread depth |
|---|---|---|---|---|
| M3 (≠DIN) | 0.5mm | 4.5mm | 5.5mm | 3.5mm |
| M4 | 0.7mm | 5.5mm | 7.0mm | 4.16mm |
| M5 | 0.8mm | 7.0mm | 8.0mm | 4.96mm |
| M6 | 1.0mm | 9.0mm | 10.0mm | 6.71mm |
| M8 | 1.25mm | 12.0mm | 13.0mm | 9.21mm |
| M10 | 1.5mm | 14.0mm | 16.0mm | 10.65mm |
| M12 | 1.75mm | 16.0mm | 18.0mm | 13.15mm |
| M14 | 2.0mm | 18.0mm | 21.0mm | 14.65mm |
| M16 | 2.0mm | 20.0mm | 24.0mm | 16.65mm |
| M18 | 2.5mm | 22.0mm | 27.0mm | 18.58mm |
| M20 | 2.5mm | 25.0mm | 30.0mm | 20.58mm |
| M22 | 2.5mm | 28.0mm | 34.0mm | 21.58mm |
| M24 | 3.0mm | 30.0mm | 36.0mm | 23.58mm |
| M27 | 3.0mm | 32.0mm | 41.0mm | 25.58mm |
| M30 | 3.5mm | 34.0mm | 46.0mm | 27.58mm |
Materials & strength
Low-profile cap
The shallow dome protects and tidies the bolt end while keeping the overall height down, useful where clearance above the nut is limited.
Steel & stainless steel
Steel covers general fixing work; stainless steel covers corrosive environments and exposed locations.
What is a DIN 917 cap nut?
DIN 917 is the low-form cap nut: a hexagon nut with a shallow closed dome over the thread. It gives the same tidy, protected bolt end as a high-form dome nut in a lower profile.
What is the difference between DIN 917 and DIN 1587?
Both are closed cap nuts; DIN 917 is the low-form pattern with a shallow cap, while DIN 1587 has a taller dome and deeper thread. The low form suits tight clearances; the high form accepts more thread protrusion.
How much thread can protrude into a DIN 917 nut?
The cap on a low-form nut is shallow, so the minimum thread depth column in the table matters when sizing the stud - the bolt end must clamp the joint without bottoming against the cap. Where more protrusion is unavoidable, a high-form dome nut such as DIN 1587 is the safer choice.
What materials are DIN 917 nuts available in?
DIN 917 cap nuts are available in steel and stainless steel across a wide range of metric sizes. Stainless suits exposed or corrosive locations.
Need DIN 917 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.