DIN 1804 Slotted Round Nuts
DIN 1804 covers slotted round nuts for hook spanners, used on machine spindles and assemblies where a compact circular nut is needed. We supply DIN 1804 nuts in steel and stainless steel A2 and A4 across a wide range of metric fine-thread sizes.
DIN 1804 dimensions
| Diameter (d1) | d2 | b | h | t | Number of Slots |
|---|---|---|---|---|---|
| M10 | 25 | 5 | 6 | 2 | 4 |
| M12 | 28 | 5 | 6 | 2 | 4 |
| M14 | 30 | 5 | 7 | 2 | 4 |
| M16 | 32 | 5 | 7 | 2 | 4 |
| M18 | 34 | 6 | 8 | 2.5 | 4 |
| M20 | 36 | 6 | 8 | 2.5 | 4 |
| M22 | 40 | 6 | 9 | 2.5 | 4 |
| M24 | 42 | 6 | 9 | 2.5 | 4 |
| M26 | 45 | 7 | 10 | 3 | 4 |
| M28 | 50 | 7 | 10 | 3 | 4 |
| M30 | 50 | 7 | 10 | 3 | 4 |
| M32 | 52 | 7 | 11 | 3 | 4 |
| M35 | 55 | 7 | 11 | 3 | 4 |
| M35 | 55 | 7 | 11 | 3 | 4 |
| M38 | 58 | 8 | 11 | 3.5 | 4 |
| M40 | 62 | 8 | 12 | 3.5 | 4 |
| M42 | 62 | 8 | 12 | 3.5 | 4 |
| M45 | 68 | 8 | 12 | 3.5 | 6 |
| M48 | 75 | 8 | 13 | 3.5 | 6 |
| M50 | 75 | 8 | 13 | 3.5 | 6 |
| M55 | 80 | 10 | 13 | 4 | 6 |
| M58 | 90 | 10 | 13 | 4 | 6 |
| M60 | 90 | 10 | 13 | 4 | 6 |
| M62 | 95 | 10 | 14 | 4 | 6 |
| M65 | 95 | 10 | 14 | 4 | 6 |
| M68 | 100 | 10 | 14 | 4 | 6 |
| M70 | 100 | 10 | 14 | 4 | 6 |
| M72 | 110 | 10 | 14 | 4 | 6 |
| M75 | 110 | 10 | 14 | 4 | 6 |
| M80 | 115 | 10 | 16 | 4 | 6 |
| M85 | 120 | 10 | 16 | 4 | 6 |
| M90 | 130 | 10 | 16 | 4 | 6 |
| M95 | 135 | 12 | 16 | 5 | 6 |
| M100 | 145 | 12 | 16 | 5 | 6 |
Materials & strength
Hook-spanner drive
Peripheral slots let the nut be tightened in positions where a hexagon and open spanner would not fit, typical of spindle and bearing arrangements.
Shaft and spindle retention
The flat, ring-shaped form provides an even clamping face for retaining bearings, sleeves and components on threaded shafts.
What is a DIN 1804 slotted round nut?
DIN 1804 covers slotted round nuts (ring nuts) with slots around the periphery, driven with a hook spanner. They are widely used on machine-tool spindles and shafts, typically for retaining bearings and similar components.
What tool fits a DIN 1804 nut?
A hook spanner (C-spanner) whose lug engages one of the slots around the nut's circumference. The slot dimensions in the table determine the spanner size needed.
Are DIN 1804 nuts fine thread?
The series is based on fine-pitch metric threads, which suit adjustment and retention on shafts and spindles. Check the pitch column against your shaft thread when ordering.
What is the difference between DIN 1804 and DIN 546?
DIN 1804 ring nuts are hook-spanner driven and run up to large shaft sizes, while DIN 546 covers small screwdriver-slotted round nuts for light duties. They share the round slotted idea but serve different jobs.
Need DIN 1804 in a non-standard size or material?
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