NSK 6917DDU dimensions and catalogue data
NSK 6917DDU is a catalogue designation for a single-row deep groove ball bearing. Its published boundary dimensions are 85×120×18 mm (bore d × outside diameter D × width B).
The listed dynamic radial rating Cr is 35 kN and the static radial rating C0r is 29.6 kN. The grease-lubricated limiting speed for this closure column is 3000 r/min.
What this marking establishes
Contact rubber seals on both sides. Use the full marking for comparison; equal d×D×B dimensions do not establish interchangeability.
Using these figures safely
- The listed load ratings support bearing calculations; neither value is a universal permissible operating load. Actual life also depends on load direction, speed, lubrication, contamination and installation.
- Use the speed entry for the stated closure and lubrication condition. The open-bearing oil value must not be transferred to a double-sealed or double-shielded bearing.
- The shoulder diameters and fillet radius describe adjacent shaft or housing geometry, not alternative bearing boundary dimensions. Heavy axial loads and a rotating outer ring require an application-specific check.
- Clearance class, tolerance class, grease grade and vehicle or machine fitment are not established by this table row. A sealed or shielded catalogue designation is not a complete supply specification without its grease and other required suffixes.
- Optional N/NR groove and retaining-ring dimensions are not assigned to this record. Those options require their own complete designation and installation check.
- The approximate mass printed for the base row is not presented as the measured mass of this closed variant. A dash or omitted value means not established here, not zero.
Technical basis:NSK, Rolling Bearings for Industrial Machinery, E1103d (2025), Part C, C030–C031; checked 2026-10-01. Values are independently organized as a technical reference; this page is not an official drawing or a fitment approval.
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Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Variant / construction | Single row deep groove ball bearings | |
| Bore diameter | d | 85 mm |
| Outside diameter | D | 120 mm |
| Width | B | 18 mm |
| Basic dynamic load rating | C | 35 kN |
| Basic static load rating | C0 | 29.6 kN |
| Sealing | Contact rubber seals on both sides |
Mounting dimensions4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum shaft shoulder diameter | da min. | 91.5 mm |
| Maximum shaft shoulder diameter | da max. | 94.5 mm |
| Maximum housing shoulder diameter | Da max. | 113.5 mm |
| Maximum shaft or housing fillet radius | ra max. | 1 mm |
Boundary dimensions4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 85 mm |
| Outside diameter | D | 120 mm |
| Bearing width | B | 18 mm |
| Minimum bearing chamfer | r min. | 1.1 mm |
Construction1 parameter
| Parameter | Symbol | Value |
|---|---|---|
| Catalogue closure construction | Contact rubber seals on both sides |
Load ratings3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Basic dynamic radial load rating | Cr | 35000 N |
| Basic static radial load rating | C0r | 29600 N |
| Equivalent-load calculation factor | f0 | 16.4 |
Lubrication-qualified speed1 parameter
| Parameter | Symbol | Value |
|---|---|---|
| Contact-sealed limiting speed with grease | 3000 r/min |