6403 bearing: complete specifications & equivalents
The 6403 is a ISO 15 radial bearing sized 17 x 62 x 17 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 17 mm |
| Outer diameter D | 62 mm |
| Width B | 17 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 22.9 kN |
| Basic static load rating C0 | 10.8 kN |
| Fatigue load limit Pu | 0.455 kN |
| Reference speed (thermal) | 28000 rpm |
| Limiting speed (mechanical) | 18000 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 270 g |
| Manufacturer designation | SKF 6403 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-25 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-24
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 6400-series range
| Bore d | 0.669 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.669 in |
| ISO bore code | 03 |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in 6400-series | 10 mm |
| Largest outer diameter in 6400-series | 250 mm |
| Width range across 6400-series | 12–58 mm |
| Bore position in 6400-series (smallest first) | 4 of 21 |
| Bore above smallest 6400-series size | 7 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6403-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 6403-2RS | GENERIC-ISO | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty. |
| 6403-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 6403-ZZ | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 6403 model number is decoded
6403 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.
Typical equipment & failure modes
Common applications
- garden equipment
- instrument drives
- fractional-horsepower electric motors
- domestic appliances
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Codes 00–03 are the exception series: 6403 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.
- The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.
- The open 6403 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Storage matters for open bearings: 6403 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.
- Suffixes stack in a defined order — clearance follows the seal code, e.g. 6403-C3. No clearance suffix means normal CN clearance.
- Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6403.
- The open 6403 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6403-2Z (shields) and 6403-2RSH (contact seals), not suffix-free 6403.
- The 22.9/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives.
Frequently asked questions
What are the dimensions of a 6403 bearing?
A 6403 deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
Are 6403 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6403 uses the same ISO 15 envelope (17×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting.
What internal clearance does 6403 have?
Unless a clearance suffix says otherwise, 6403 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6403 and verify the residual clearance after mounting.
How should 6403 be mounted?
Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals.
What is the SKF designation and catalogue data for 6403?
In the SKF Rolling Bearings catalogue this size is listed as 6403 — the open (unsealed) execution, 17×62×17 mm per ISO 15. Quoted values: C 22.9 kN, C0 10.8 kN, Pu 0.455 kN, limiting speed 18000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6403.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-25. Read our editorial & correction policy.