K55X62X18 bearing: complete specifications & equivalents
The K55X62X18 is a DIN 5402 radial bearing sized 55 x 62 x 18 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 | 62 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 34.1 kN |
| Basic static load rating C0 | 71 kN |
| Fatigue load limit Pu | 8.5 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52 g |
| Manufacturer designation | K 55x62x18 |
| 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 | 2.441 in |
| Width B | 0.709 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 3.5 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 K55X62X18 model number is decoded
SKF catalogue number K 55x62x18 denotes a needle roller and cage assembly for a 55 mm shaft seat — the cage spaces the rollers, the machine parts provide both raceways, and the 18 mm width is all the radial room it needs. Reading the designation: K marks the needle roller and cage assembly, the three numbers give Fw 55 (shaft journal), E 62 (assembly outside diameter) and B 18 (width) in millimetres — the machine parts complete the bearing. Because there are no rings, execution differences live in the cage: TN polymer cages reduce friction and noise, while the basic steel cage tolerates higher operating temperatures up to the lubricant limit. Speed planning separates the two ceilings: 7,500 r/min thermal reference and 8,500 r/min mechanical limiting — needle bearings tolerate high rpm only with adequate lubricant film at the 55 mm seat. Lubrication reaches both raceways through the open cage windows; grease the bore and journal before assembly, since after fitting the 18 mm narrow cage cannot be relubricated through a closed housing.
Typical equipment & failure modes
Common applications
- rocker arm and rocker pin pivots on camshafts
- pump and gearbox idler gears running on hardened pins
- hinge and pivot joints in printing and textile machinery
- universal joint crosses on commercial vehicles
Known failure patterns
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- cage pocket wear and roller skew after sustained operation with too little radial preload
- abrasive paste formation from dust ingressing past open ends without effective housing seals
- electrical erosion on VFD-driven shafts without brush or insulated mounting
- 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.
- 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 34.1/71 kN ratings and 52 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 55x62x18 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 55x62x18 have?
A K 55x62x18 measures 55 mm bore/Fw × 62 mm outside diameter × 18 mm width (2.165 × 2.441 × 0.709 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 34.1 kN, static C0 71 kN, fatigue limit Pu 8.5 kN, limiting speed 8,500 r/min, reference speed 7,500 r/min, mass about 52 g.
What does K 55x62x18 mean in SKF part numbering?
K = needle roller and cage assembly (DIN 5402); the three figures give Fw 55 mm (shaft journal), E 62 mm (complement outside diameter, matched by the housing bore) and B 18 mm width. TN marks the glass fibre reinforced PA66 cage.
Does the K 55x62x18 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.