32315 bearing: complete specifications & equivalents
The 32315 is a ISO 355 radial bearing sized 75 x 160 x 58 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 75 mm |
| Outer diameter D | 160 mm |
| Width B | 58 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 416 kN |
| Basic static load rating C0 | 440 kN |
| Fatigue load limit Pu | 51 kN |
| Reference speed (thermal) | 3200 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5200 g |
| Manufacturer designation | SKF 32315 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB); 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 & 32300-series range
| Bore d | 2.953 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 2.283 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 42.5 mm |
| Smallest bore in 32300-series | 20 mm |
| Largest outer diameter in 32300-series | 460 mm |
| Width range across 32300-series | 22.25–154 mm |
| Bore position in 32300-series (smallest first) | 13 of 30 |
| Bore above smallest 32300-series size | 55 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32315 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 32315 model number is decoded
Ordering number SKF 32315 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 75 mm shaft, extra-heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 32315 reads as bearing type 3 (single-row tapered roller), extra-heavy section series 2, and bore reference 15 resolving to 75 mm; 160 mm OD and 58 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 3,200 r/min reference speed the 42.5 mm-section 32315 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 4,300 r/min as the mechanical ceiling. Fit selection follows the rotating ring — interference on a rotating cone — and two 32315 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.
Typical equipment & failure modes
Common applications
- marine deck machinery shafts
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
- rolling-mill auxiliary drives
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- Mount the 75 mm bore 32315 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.
- The 323 series at 75 mm bore (160×58 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30215, so recalculate dn and lubricant film before substitution.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 32315 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 32315 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Open 32315 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.
- The 416/440 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 32315 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32315 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 32315?
The SKF 32315 is a single-row tapered roller bearing with 75 mm bore, 160 mm outer diameter and 58 mm width (2.953 × 6.299 × 2.283 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 416 kN, C0 440 kN, fatigue load limit Pu 51 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 5200 g. It is an open, separable bearing with a pressed-steel cage.
How does the 32315 bore code work?
The last two digits of 32315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 58 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 32315 series and basic execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution.
Can a single 32315 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does 32315 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32315 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB on 2026-09-26. Read our editorial & correction policy.