AXW40 bearing: complete specifications & equivalents
The AXW40 is a ISO 3031 radial bearing sized 40 x 63 x 4.2 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 40 mm |
| Outer diameter D | 63 mm |
| Width B | 4.2 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 25 kN |
| Basic static load rating C0 | 114 kN |
| Fatigue load limit Pu | 13.7 kN |
| Reference speed (thermal) | 2800 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 39 g |
| Manufacturer designation | AXW 40 |
| 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 | 1.575 in |
|---|---|
| Outer diameter D | 2.48 in |
| Width B | 0.165 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 11.5 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) | 8 of 9 |
| Bore above smallest AXW-series size | 30 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the AXW40 model number is decoded
The flanged thrust bearing AXW 40 combines a 40 mm bore, a 63 mm outer track and a 47 mm centring spigot in one 4.2 mm high unit; the needle contact runs 45–58 mm and the rating is 25 kN dynamic. The designation AXW 40 reads as flanged (AXW) needle thrust for a 40 mm shaft — the spigot pilots in the 47 mm housing register, not on the shaft. The integrated washer carries a 47 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 40 mm bore clears the shaft and does no radial piloting. One direction only: AXW 40 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. Mounting: locate the 47 mm spigot in the housing register bore (at least 4 mm deep), pass the 40 mm bore over the shaft without forcing a pilot fit, and fit a separate LS/AS washer or a hardened 58–64 HRC face on the opposite side.
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
- spigot lip deformation after a hammer blow or cocked assembly at fitting
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
- edge loading across the needle crowns when the mating faces are not square to the shaft
- hard-particle indentation where oil or grease filtration is inadequate
Selection pitfalls — read before you substitute
- At 40 mm, verify the opposite raceway face — the integrated spigot washer supplies one side only; a soft face or missing LS/AS washer on the other ribs within months.
- One-direction thrust: reversing force dumps the needles off the 58 mm outer track — mirror a second spigot-flanged unit where the load reverses.
- The spigot pilots in the housing register, not on the shaft: turning the 40 mm bore into a tight pilot fit, or omitting the 47 mm register bore, defeats the centring function of AXW 40.
- AXW is not an ISO-standardized interchangeable outline for every maker — check the 63×4.2 mm envelope and the 47 mm spigot before cross-brand substitution.
- The 25 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 25/114 kN ratings and 39 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
Does the AXW 40 still need hardened faces?
The integrated spigot washer is one hardened raceway, but the opposing face is the application's responsibility — fit a separate LS/AS washer or harden it to 58–64 HRC over Ea 45–Eb 58 mm.
How is an AXW bearing mounted?
Locate the 47 mm spigot in the housing register bore, pass the 40 mm bore over the shaft without a pilot fit, fit a separate LS/AS washer or a 58–64 HRC face on the opposite side, and press via the washer back only.
What are the dimensions and ratings of the AXW 40?
A AXW 40 measures 40 mm bore × 63 mm outside diameter × 4.2 mm width (1.575 × 2.48 × 0.165 in). From SKF catalogue PUB BU/P1 17000: dynamic C 25 kN, static C0 114 kN, fatigue limit Pu 13.7 kN, reference speed 2,800 r/min, limiting speed 5,600 r/min, mass about 39 g. Centring spigot D1 47 mm, spigot height B1 4 mm, contact band Ea 45–58 mm.
What is the centring spigot on the AXW 40 for?
The 47 mm diameter, 4 mm high spigot locates the bearing in a matching housing register and centres the needle set radially; it does not pilot on the 40 mm shaft.
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.