DIN 1587 Dome Nuts
DIN 1587 covers hexagon domed cap nuts — a closed crown that covers the bolt end for protection and a tidy finish. We supply DIN 1587 dome nuts in steel property class 6, stainless steel A2 and A4, brass and nylon, across a wide range of metric sizes.
DIN 1587 dimensions
| Diameter | Pitch | Depth of Hex | Across Flats | Overall height | diameter of dome | Internall thread length |
|---|---|---|---|---|---|---|
| M3 | 0.5mm | 2.5mm | 5.5mm | 6.5mm | 5mm | 4.5mm |
| M4 | 0.7mm | 3.2mm | 7mm | 8mm | 6.5mm | 5.5mm |
| M5 | 0.8mm | 4mm | 8mm | 10mm | 7.5mm | 7.5mm |
| M6 | 1.0mm | 5mm | 10mm | 12mm | 9.5mm | 8mm |
| M7 | 1.0mm | 5.5mm | 11mm | 13.5mm | 10.5mm | 10.5mm |
| M8 | 1.25mm | 6.5mm | 13mm | 15mm | 12.5mm | 11mm |
| M10 | 1.5mm | 8mm | 17mm | 18mm | 16mm | 13mm |
| M12 | 1.75mm | 10mm | 19mm | 22mm | 18mm | 16mm |
| M14 | 2mm | 11mm | 22mm | 25mm | 21mm | 18mm |
| M16 | 2mm | 13mm | 24mm | 28mm | 23mm | 21mm |
| M18 | 2.5mm | 15mm | 27mm | 32mm | 26mm | 25mm |
| M20 | 2.5mm | 16mm | 30mm | 34mm | 28mm | 26mm |
| M22 | 2.5mm | 18mm | 32mm | 39mm | 31mm | 29mm |
| M24 | 3.0mm | 19mm | 36mm | 42mm | 34mm | 31mm |
Materials & strength
Closed-dome protection
The dome covers the exposed thread end, protecting it from mechanical damage and giving assemblies a finished appearance; corrosion resistance comes from the nut material and finish.
Materials for appearance and environment
Steel grade 6 covers general work, A2/A4 stainless covers corrosive conditions, and brass or nylon suits decorative and insulating duties.
What is a DIN 1587 dome nut?
DIN 1587 is the standard high-form hexagon dome (cap) nut. The closed dome covers the exposed bolt end, giving a neat finish and physically protecting the thread from damage; corrosion resistance comes from the nut material and finish rather than the cap itself.
Where are dome nuts used?
Anywhere an exposed bolt end needs covering - railings, guarding, furniture, vehicle and plant trim. The dome improves appearance, keeps dirt off the thread and covers a sharp thread end where people may come into contact with it.
How long can the bolt be under a dome nut?
Choose the bolt or stud length so the end does not contact the inside of the dome before the nut has clamped the joint; the internal thread length in the table is the working figure. A bolt that bottoms in the cap can hold the joint loose even though the nut feels tight.
What is the difference between DIN 1587, DIN 917 and DIN 986?
DIN 1587 is the high-form dome nut and DIN 917 the low-form pattern with a shallower cap; DIN 986 adds a nylon locking insert to the domed form. Choose by profile, thread protrusion and whether locking is needed.
What materials are DIN 1587 nuts available in?
DIN 1587 dome nuts are available in steel grade 6, stainless steel A2 and A4, brass and nylon across a wide range of metric sizes. Brass and nylon suit decorative, corrosion-sensitive or insulating applications.
Need DIN 1587 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.