K55X63X32 bearing: complete specifications & equivalents
The K55X63X32 is a DIN 5402 radial bearing sized 55 x 63 x 32 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 55 mm |
| Outer diameter D | 63 mm |
| Width B | 32 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 59.4 kN |
| Basic static load rating C0 | 129 kN |
| Fatigue load limit Pu | 16.3 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 102 g |
| Manufacturer designation | K 55x63x32 |
| Standard | DIN 5402 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.1 needle roller and cage assemblies |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.1 needle roller and cage assemblies) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.1 needle roller and cage 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 & K-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 2.48 in |
| Width B | 1.26 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 4 mm |
| Smallest bore in K-series | 3 mm |
| Largest outer diameter in K-series | 63 mm |
| Width range across K-series | 7–32 mm |
| Bore position in K-series (smallest first) | 22 of 22 |
| Bore above smallest K-series size | 52 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the K55X63X32 model number is decoded
SKF lists K 55x63x32 in the K series of needle roller and cage assemblies: needle rollers caged at 55×63×32 mm, designed to run directly on a ground, hardened shaft and inside a machined housing bore. In the K code K 55x63x32, Fw×E×B reads directly as journal 55 mm, complement diameter 63 mm and cage width 32 mm; the housing bore is ground to E with H6/H7 tolerance to complete the outer raceway. SKF supplies these assemblies in single rows as tabulated; the cage quality determines the speed ceiling, and the catalogued 8,500 r/min limiting speed assumes a precision ground journal and bore. Catalogue mass 102 g at 55×63×32 mm makes this one of the highest capacity-per-gram choices in the needle roller and cage assemblies; the limit is usually the shaft's ability to serve as a raceway, not the rolling contact itself. Mounting: grind the 55 mm journal to the catalogue raceway tolerance after hardening to 58–64 HRC, bore the housing to E 63 mm H6, and slide the assembly in axially — pressing through the cage distorts it and locks the rollers.
Typical equipment & failure modes
Common applications
- planetary gear pins in compact transmissions
- connecting rods of small compressors where radial height is critical
- rocker arm and rocker pin pivots on camshafts
- pump and gearbox idler gears running on hardened pins
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
- grease starvation at the roller ends when relubrication intervals are stretched in dirty duty
- corrosion pitting from condensation in intermittently operated machinery
- smearing of rollers and journal during idle periods because the radial section holds too little lubricant
Selection pitfalls — read before you substitute
- Above 50 mm bore, thermal growth matters: the 55 mm inner ring or journal grows with temperature faster than the housing, and the small clearance of a needle roller contact leaves little reserve — check running clearance hot, not just at assembly.
- Oscillating pivots fail differently: rocking through a small angle concentrates wear in the same roller positions — inspect those zones, and consider rotating the assembly's clock position at service intervals.
- Contamination, not fatigue, kills most small needle bearings: with raceways this narrow, one hard particle dents a full-width line — seal the housing even when the bearing execution itself is open.
- The 59.4/129 kN ratings and 102 g mass are SKF catalogue values transcribed from ch. 7.1 of PUB BU/P1 17000 (PDF table page 618); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
How should the K 55x63x32 be mounted?
Slide the assembly over the ground 55 mm journal with a mounting sleeve, bore the housing to E 63 mm, and retain with a washer spanning the cage. Never press against the cage or rotate before the bearing is lubricated and loaded.
What limits the service life of a K 55x63x32?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 55 mm seat, lubricant condition at the roller ends, and contamination through open ends — the 4.0 mm radial section leaves no reserve once a raceway is dented or ribboned.
What are the dimensions and ratings of the K 55x63x32?
A K 55x63x32 measures 55 mm bore/Fw × 63 mm outside diameter × 32 mm width (2.165 × 2.48 × 1.26 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 59.4 kN, static C0 129 kN, fatigue limit Pu 16.3 kN, limiting speed 8,500 r/min, reference speed 7,500 r/min, mass about 102 g.
How is the K 55x63x32 designation read?
K = needle roller and cage assembly (DIN 5402); the three figures give Fw 55 mm (shaft journal), E 63 mm (complement outside diameter, matched by the housing bore) and B 32 mm width. TN marks the glass fibre reinforced PA66 cage.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.1 needle roller and cage assemblies on 2026-09-26. Read our editorial & correction policy.