Product and application brief
Round nuts have a cylindrical body rather than hexagon wrench flats. Peripheral slots can provide a hook-spanner interface. In bearing assemblies, the selected nut positions a bearing or another component on a threaded shaft or sleeve. A slotted outline alone does not identify the locking system or establish interchangeability.
Product forms and reference names
| Choice or field | What to identify |
|---|---|
| Slotted round nut reference | DIN Media lists DIN 1804:1971-03 as current and identifies a round nut for a hook spanner with ISO metric fine thread. Ganter's DIN 1804 catalogue illustrates this construction. The standard identity does not establish our conformity or a universal bearing-system match. |
| Bearing nut with separate locking device | SKF's catalogue separates nut families requiring a keyway from those with integral locking. Identify the precise nut, corresponding washer or locking plate, and shaft or sleeve interface as a system; do not quote the nut alone when the locking device is required. |
| Integral locking-screw construction | SKF's KMF leaflet illustrates a separate family with built-in locking screws. Such maker codes describe particular constructions, not a generic upgrade interchangeable with every plain slotted nut. |
Thread and shaft interface
Record diameter, pitch, thread system, hand and required fit from the selected drawing. Include the shaft or sleeve designation and any keyway. Matching outer diameter, a nominal bearing size or a photograph does not establish the mating thread.
Locating face and nut envelope
The bearing-facing surface, nut width, outside diameter and spanner slots belong in the controlled specification. Distinguish the face against the component from the tool-access face. Do not transfer one catalogue's face treatment, run-out or hardness to another nut.
Locking device is a separate selection
State whether the order uses a separate washer or plate or a specified integral mechanism. Identify included components, their orientation and the corresponding shaft features. The generic illustration shows only a plain slotted round nut; it does not depict an installed lock, set-screw system or a tested assembly.
Not the same as a slotted or castle hex nut
A castle or slotted hex nut uses a different body and pin-related interface. Peripheral spanner slots in a round nut are not proof that a split pin can be used. Keep bearing positioning hardware separate from the existing slotted-and-castle-nut family.
Reference and installation boundaries
Specify the exact standard and edition or manufacturer's reference with drawing revision. DIN 1804 and SKF family codes are separate identities, not an equivalence statement. This page supplies no installation sequence, bearing preload, tightening torque, axial load rating or reuse guarantee; those remain with the selected system's instructions and responsible assembly design.
Specification fields
| Choice or field | What to identify |
|---|---|
| Part identity | Selected standard and edition, exact maker reference or controlled drawing revision; plain nut versus complete locking assembly. |
| Mating interface | Shaft/sleeve and bearing or component reference, thread diameter and pitch, hand, fit and keyway if required. |
| Nut geometry | Outside diameter, width, locating-face geometry, slot count and size, installation/tool clearance; units and agreed tolerances. |
| Locking parts | Exact washer, plate or integral locking-screw construction, included pieces and any required replacement components. |
| Order requirements | Material and finish, inspection documents and traceability, quantity in nuts or complete identified assemblies. |
Common product questions
Are round nut slots the same as castle nut slots?
No. The round nut's peripheral tool interface and the castle nut's pin interface must be identified separately.
Does a plain slotted nut lock itself?
Do not assume it does. Specify the exact locking arrangement and mating shaft features.
Can a bearing family code replace a complete thread designation?
No. Use the precise referenced part and mating drawing; confirm thread and supplied locking components.
Related product choices
Product references
References checked 9 October 2026 identify structures, not FastenerBridge stock, certification or brand affiliation. Final requirements follow the selected specification. No universal dimensions, load rating or tightening torque is stated.