AXW25 bearing: complete specifications & equivalents
The AXW25 is a ISO 3031 radial bearing sized 25 x 45 x 3.2 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 25 mm |
| Outer diameter D | 45 mm |
| Width B | 3.2 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 13.4 kN |
| Basic static load rating C0 | 60 kN |
| Fatigue load limit Pu | 6.95 kN |
| Reference speed (thermal) | 3800 rpm |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 20 g |
| Manufacturer designation | AXW 25 |
| Standard | ISO 3031 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange); 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 & AXW-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 1.772 in |
| Width B | 0.126 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 10 mm |
| Smallest bore in AXW-series | 10 mm |
| Largest outer diameter in AXW-series | 68 mm |
| Width range across AXW-series | 3.2–4.2 mm |
| Bore position in AXW-series (smallest first) | 5 of 9 |
| Bore above smallest AXW-series size | 15 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the AXW25 model number is decoded
SKF lists AXW 25 in SKF catalogue PUB BU/P1 17000 ch. 12.2: the 4 mm high, 32 mm diameter spigot centres the bearing radially in the housing while the needle set takes one-direction thrust of 13.4 kN. AXW numbering gives the bore directly (25 mm for AXW 25); the needle set inside is the AXK 2542 track with 13.4 kN dynamic rating. The integrated washer carries a 32 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 25 mm bore clears the shaft and does no radial piloting. One direction only: AXW 25 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Because the spigot sets concentricity, the shaft fit relaxes versus a piloted washer; still harden or washer-face the opposite track to 58–64 HRC across the 29–41 mm contact band.
Typical equipment & failure modes
Common applications
- material-handling swivel joints using the spigot as a built-in housing pilot
- transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register
- automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore
- agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted
Known failure patterns
- centring-spigot fretting in a loose register bore until the needle set runs eccentric
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
- edge loading across the needle crowns when the mating faces are not square to the shaft
- false brinelling and rust-red witness marks on standby machines under external vibration
Selection pitfalls — read before you substitute
- On a 25 mm shaft the register fit decides concentricity: a loose or oversize 32 mm register bore lets the 3.2 mm needle set orbit, wearing a groove in both tracks.
- The 13.4 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.
- the 3,800 r/min reference speed is the thermal criterion under load, limiting speed 7,500 r/min; the open needle set needs the housing to keep grit out.
- The spigot pilots in the housing register, not on the shaft: turning the 25 mm bore into a tight pilot fit, or omitting the 32 mm register bore, defeats the centring function of AXW 25.
- AXW is not an ISO-standardized interchangeable outline for every maker — check the 45×3.2 mm envelope and the 32 mm spigot before cross-brand substitution.
- The 13.4/60 kN ratings and 20 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
What are the common mounting mistakes?
Pressing on the spigot lip, boring no register (or a wrong-size 32 mm register) in the housing, forcing the 25 mm bore into a pilot fit, leaving the opposite face soft, or skipping grease in the 3.2 mm section — each shows up as cage or track damage within hours.
Which dimensions does the AXW 25 have?
A AXW 25 measures 25 mm bore × 45 mm outside diameter × 3.2 mm width (0.984 × 1.772 × 0.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13.4 kN, static C0 60 kN, fatigue limit Pu 6.95 kN, reference speed 3,800 r/min, limiting speed 7,500 r/min, mass about 20 g. Centring spigot D1 32 mm, spigot height B1 4 mm, contact band Ea 29–41 mm.
What does AXW mean versus AXK?
AXW pairs an AXK needle set with a washer that has an integral centring spigot — the spigot locates in a housing register and keeps the set concentric as one part; AXK is the bare cage needing two separate washers. A separate LS/AS washer or hardened face is still required opposite, and the outline is not multi-brand interchangeable.
Can the AXW 25 take radial load?
No. The spigot is a locating pilot, not a radial bearing: the needle set carries one-direction thrust (13.4 kN dynamic) and the shaft arrangement carries all radial force.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange on 2026-09-27. Read our editorial & correction policy.