AXK6590 bearing: complete specifications & equivalents
The AXK6590 is a ISO 3031 radial bearing sized 65 x 90 x 3 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 65 mm |
| Outer diameter D | 90 mm |
| Width B | 3 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 39 kN |
| Basic static load rating C0 | 255 kN |
| Fatigue load limit Pu | 31 kN |
| Reference speed (thermal) | 2000 rpm |
| Limiting speed (mechanical) | 4000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 35 g |
| Manufacturer designation | AXK 6590 |
| Standard | ISO 3031 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies); 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 & AXK-series range
| Bore d | 2.559 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.118 in |
| ISO bore code | 90 |
| Radial section height (D−d)/2 | 12.5 mm |
| Smallest bore in AXK-series | 4 mm |
| Largest outer diameter in AXK-series | 200 mm |
| Width range across AXK-series | 2–5 mm |
| Bore position in AXK-series (smallest first) | 18 of 30 |
| Bore above smallest AXK-series size | 61 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the AXK6590 model number is decoded
AXK 6590 is a needle roller and cage thrust assembly to ISO 3031: a 3 mm thin cage packing the maximum number of small needles for a 65 mm shaft raceway and 90 mm outside track, as listed in SKF catalogue PUB BU/P1 17000 ch. 12.1. The designation AXK 6590 identifies a 3 mm needle thrust cage for the 65–90 mm track; the same diameters select the matching hardened washers, which is the usual ordering error to avoid. At this size the stamped steel cage guides long thrust needles; the TN polymer-cage variant is offered where noise matters. One-direction thrust only. The 35 g mass and 3 mm axial height sit between 65 and 90 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 70–Eb 88 mm band (or fit AS/LS washers), drop the 3 mm cage in flat, and never press or hammer the needle complement.
Typical equipment & failure modes
Common applications
- light turntables, index plates and office-machine pivots
- two-wheeler gearbox selector and layshaft thrust faces
- compact drives where hardened washers replace a machined raceway shoulder
- automotive manual and automatic transmission thrust positions
Known failure patterns
- instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- hard-particle indentation where oil or grease filtration is inadequate
- edge loading across the needle crowns when the mating faces are not square to the shaft
Selection pitfalls — read before you substitute
- At 65 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.
- The AXK code supplies no washers: AXK 6590 arrives as the needle cage only, and a "bearing failure" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.
- Match washers by the exact 65–90 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.
- the 2,000 r/min reference speed is the thermal criterion under load, the 4,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.
- The 39 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.
- The 39/255 kN ratings and 35 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
How is the AXK 6590 code read?
AXK marks the needle thrust assembly and 65/90 gives the inner 65 mm and outer 90 mm track diameters directly; the assembly is 3 mm thick. TN means the polymer cage instead of stamped steel.
What minimum hardness do the mating faces need?
58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 39 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated.
How is an AXK thrust assembly mounted?
Harden or washer-face both tracks across Ea 70–Eb 88 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them.
What are the dimensions and ratings of the AXK 6590?
A AXK 6590 measures 65 mm bore × 90 mm outside diameter × 3 mm width (2.559 × 3.543 × 0.118 in). From SKF catalogue PUB BU/P1 17000: dynamic C 39 kN, static C0 255 kN, fatigue limit Pu 31 kN, reference speed 2,000 r/min, limiting speed 4,000 r/min, mass about 35 g. The contact band runs Ea 70–Eb 88 mm; hardened washers or 58–64 HRC faces are required.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies on 2026-09-27. Read our editorial & correction policy.