PNA35-55 bearing: complete specifications & equivalents
The PNA35-55 is a DIN 616 radial bearing sized 35 x 55 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 35 mm |
| Outer diameter D | 55 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 26.4 kN |
| Basic static load rating C0 | 51 kN |
| Fatigue load limit Pu | 6.3 kN |
| Reference speed (thermal) | 10000 rpm |
| Limiting speed (mechanical) | 11000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 180 g |
| Manufacturer designation | PNA 35/55 |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.6 alignment needle roller bearings, with an inner ring |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.6 alignment needle roller bearings, with an inner ring) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.6 alignment needle roller bearings, with an inner ring); 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 & PNA-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 2.165 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 10 mm |
| Smallest bore in PNA-series | 12 mm |
| Largest outer diameter in PNA-series | 62 mm |
| Width range across PNA-series | 12–20 mm |
| Bore position in PNA-series (smallest first) | 8 of 9 |
| Bore above smallest PNA-series size | 23 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NA4907 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×55×20 mm envelope, but catalogue C/C0 differ between the executions (26.4/51 vs 31.9/54 kN) — boundary dimensions match, not a load-rating equivalent. |
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 PNA35-55 model number is decoded
In SKF catalogue PUB BU/P1 17000, PNA 35/55 denotes an alignment needle roller bearing for a 35 mm inner-ring shaft: machined rings, integral flanges, and a spherical outside surface that compensates static misalignment of the housing bore. The code PNA 35/55 reads as alignment needle roller bearing, 35 mm inner-ring bore, 20 mm width — the wide section is what absorbs both load and the seat-angle errors the family is designed for. The alignment range is meant for static seat errors, not continuous swivelling under load — dynamic pivoting races the sphered surface and requires grease with extreme-pressure additives. Catalogue mass 180 g at 35×55×20 mm makes this one of the highest capacity-per-gram choices in the self-aligning needle roller bearings with inner ring; the limit is usually the shaft's ability to serve as a raceway, not the rolling contact itself. The sphered seat must be clean and lightly oiled — a scored seat converts the alignment feature into a friction lock, and the needle rollers then take the seat error the family was meant to absorb.
Typical equipment & failure modes
Common applications
- construction equipment blade and arm pivots
- steering knuckles and kingpin supports with seat angle errors
- pivot bearings where housing bores cannot be kept coaxial
- linkage eyes and clevis mounts on frames that flex
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after overload events
- polymer cage deformation when the local temperature exceeds the 120 °C sustained limit
- abrasive paste formation from dust ingressing past open ends without effective housing seals
- brinelling of raceways from impact or pressing force transmitted through the rolling elements
Selection pitfalls — read before you substitute
- At 35 mm bore, verify shaft deflection against the needle length: these rollers tolerate little edge loading, and a simply supported span between 35 mm seats can bend past the compensation range long before the load rating is exhausted.
- Hardness is load capacity: in families without an inner ring the 35 mm journal must hold 58–64 HRC with a ground finish; a surface that looks fine but sits at 45 HRC will rib the raceway within weeks.
- The quoted 26.4/51 kN ratings are SKF catalogue values for this exact execution (PNA 35/55); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- The 26.4/51 kN ratings and 180 g mass are SKF catalogue values transcribed from ch. 7.6 of PUB BU/P1 17000 (PDF table page 652); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
Can the PNA 35/55 run on an unhardened shaft?
Depends on the family member: RPNA runs directly on the shaft (hardened, 58–64 HRC, ground), while PNA includes a ground inner ring for an ordinary 35 mm k5 seat. Both add the sphered outer ring for seat misalignment.
How should the PNA 35/55 be mounted?
Press on the ring faces only with a fitting sleeve, keep everything square to the 35 mm seat, and never transmit force through the rolling elements. Follow the catalogue's seat tolerances — the narrow needle contact forgives neither tilt nor burrs.
What limits the service life of a PNA 35/55?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 35 mm seat, lubricant condition at the roller ends, and contamination through open ends — the 10.0 mm radial section leaves no reserve once a raceway is dented or ribboned.
What are the dimensions and ratings of the PNA 35/55?
A PNA 35/55 measures 35 mm bore/Fw × 55 mm outside diameter × 20 mm width (1.378 × 2.165 × 0.787 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 26.4 kN, static C0 51 kN, fatigue limit Pu 6.3 kN, limiting speed 11,000 r/min, reference speed 10,000 r/min, mass about 180 g.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.6 alignment needle roller bearings, with an inner ring on 2026-09-26. Read our editorial & correction policy.