K55X60X20 bearing: complete specifications & equivalents
The K55X60X20 is a DIN 5402 radial bearing sized 55 x 60 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 | 55 mm |
| Outer diameter D | 60 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 27 kN |
| Basic static load rating C0 | 67 kN |
| Fatigue load limit Pu | 8.15 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 40 g |
| Manufacturer designation | K 55x60x20 |
| 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 | 2.362 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 2.5 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 K55X60X20 model number is decoded
In SKF catalogue PUB BU/P1 17000 ch. 7.1, K 55x60x20 appears as a needle roller and cage assembly with complement diameter E 60 mm and width 20 mm — a self-contained roller set that turns a 55 mm shaft and its housing into a complete bearing. Reading the designation: K marks the needle roller and cage assembly, the three numbers give Fw 55 (shaft journal), E 60 (assembly outside diameter) and B 20 (width) in millimetres — the machine parts complete the bearing. No suffix on the order number means the standard single-row assembly; the polymer TN cage version is the usual choice for grease-lubricated pivots where noise matters. The 40 g catalogue mass and 2.5 mm radial section ((60−55)/2) frame a rating of about 0.49 kN dynamic per millimetre of bore — the needle construction's density advantage over ball bearings of the same envelope. Mounting: grind the 55 mm journal to the catalogue raceway tolerance after hardening to 58–64 HRC, bore the housing to E 60 mm H6, and slide the assembly in axially — pressing through the cage distorts it and locks the rollers.
Typical equipment & failure modes
Common applications
- pump and gearbox idler gears running on hardened pins
- hinge and pivot joints in printing and textile machinery
- universal joint crosses on commercial vehicles
- planetary gear pins in compact transmissions
Known failure patterns
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- 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
- corrosion pitting from condensation in intermittently operated machinery
- rapid raceway scoring when the shaft journal hardness drops below 58 HRC or the ground finish wears away
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.
- Reference and limiting speeds are different limits: the 7,500 r/min reference is the thermal criterion under load, The limiting value is mechanical; the reference value is thermal under load, and grease choice moves it substantially.
- Hardness is load capacity: in families without an inner ring the 55 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 27/67 kN ratings and 40 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
Is the K 55x60x20 sealed?
No — this execution is open and depends on the housing sealing arrangement; grease it at assembly and keep the relubrication interval short in dirty duty.
Which dimensions does the K 55x60x20 have?
A K 55x60x20 measures 55 mm bore/Fw × 60 mm outside diameter × 20 mm width (2.165 × 2.362 × 0.787 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 27 kN, static C0 67 kN, fatigue limit Pu 8.15 kN, limiting speed 8,500 r/min, reference speed 7,500 r/min, mass about 40 g.
What does K 55x60x20 mean in SKF part numbering?
K = needle roller and cage assembly (DIN 5402); the three figures give Fw 55 mm (shaft journal), E 60 mm (complement outside diameter, matched by the housing bore) and B 20 mm width. TN marks the glass fibre reinforced PA66 cage.
Does the K 55x60x20 need a hardened and ground shaft?
No. In this execution the 55 mm shaft journal is the inner raceway: it must be ground and hardened to 58–64 HRC (with matching housing bore quality on the outside). If the shaft cannot meet that, order the inner-ring sibling (NKI/NA execution) plus its ground inner ring instead.
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.