AXK5070 bearing: complete specifications & equivalents
The AXK5070 is a ISO 3031 radial bearing sized 50 x 70 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 | 50 mm |
| Outer diameter D | 70 mm |
| Width B | 3 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 28.5 kN |
| Basic static load rating C0 | 143 kN |
| Fatigue load limit Pu | 17 kN |
| Reference speed (thermal) | 2400 rpm |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 20 g |
| Manufacturer designation | AXK 5070 |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 2.756 in |
| Width B | 0.118 in |
| ISO bore code | 70 |
| Radial section height (D−d)/2 | 10 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) | 15 of 30 |
| Bore above smallest AXK-series size | 46 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the AXK5070 model number is decoded
AXK 5070 gives thrust capacity in the height of a shim: 50 mm inner track, 70 mm outer track, only 3 mm thick, with needles held by the stamped steel cage for one-direction axial load. SKF prints the AXK sizes as adjacent figures, so 50/70 reads 50 then 70 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The assembly itself has no rings: both raceways must be supplied as hardened washers or machine faces (58–64 HRC, ground), with the contact band covering Ea 55 to Eb 68 mm. The 20 g mass and 3 mm axial height sit between 50 and 70 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Grease both faces before assembly so the needles stay in their pockets, especially for the 3 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.
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)
- grease churning and overheating when a high-speed thrust position is over-packed
- false brinelling and rust-red witness marks on standby machines under external vibration
- edge loading across the needle crowns when the mating faces are not square to the shaft
Selection pitfalls — read before you substitute
- On a 50 mm shaft the cage is only 3 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.
- The 28.5 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.
- Do not expect misalignment tolerance: a 3 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.
- The AXK code supplies no washers: AXK 5070 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 50–70 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.
- The 28.5/143 kN ratings and 20 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
What is the difference between AXK and AXW?
AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side.
Does the AXK 5070 tolerate misalignment?
No — the 3 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families.
Why does an AXK assembly fail early?
Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 28.5 kN assumes all of these are correct.
Which dimensions does the AXK 5070 have?
A AXK 5070 measures 50 mm bore × 70 mm outside diameter × 3 mm width (1.969 × 2.756 × 0.118 in). From SKF catalogue PUB BU/P1 17000: dynamic C 28.5 kN, static C0 143 kN, fatigue limit Pu 17 kN, reference speed 2,400 r/min, limiting speed 5,000 r/min, mass about 20 g. The contact band runs Ea 55–Eb 68 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.