K45X53X28 bearing: complete specifications & equivalents
The K45X53X28 is a DIN 5402 radial bearing sized 45 x 53 x 28 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 53 mm |
| Width B | 28 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 49.5 kN |
| Basic static load rating C0 | 98 kN |
| Fatigue load limit Pu | 12.2 kN |
| Reference speed (thermal) | 9000 rpm |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 81 g |
| Manufacturer designation | K 45x53x28 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 2.087 in |
| Width B | 1.102 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) | 19 of 22 |
| Bore above smallest K-series size | 42 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the K45X53X28 model number is decoded
K 45x53x28 is a needle roller and cage assembly to DIN 5402: a complement of needle rollers held by a lightweight cage, with no inner or outer ring of its own — the 45 mm hardened shaft journal and the 53 mm housing bore serve as the raceways, as tabulated in SKF catalogue PUB BU/P1 17000. Reading the designation: K marks the needle roller and cage assembly, the three numbers give Fw 45 (shaft journal), E 53 (assembly outside diameter) and B 28 (width) in millimetres — the machine parts complete the bearing. The TN suffix marks a glass fibre reinforced PA66 cage snapping the rollers in place — lighter and quieter than steel; assemblies are also supplied unmarked with steel cages for higher temperature duty. Minimum load matters: below roughly 0.02·C the rollers skid and smear; preloading the pivot or specifying a heavier execution avoids the glazing that pure oscillation produces on these raceways. Mounting: grind the 45 mm journal to the catalogue raceway tolerance after hardening to 58–64 HRC, bore the housing to E 53 mm H6, and slide the assembly in axially — pressing through the cage distorts it and locks the rollers.
Typical equipment & failure modes
Common applications
- universal joint crosses on commercial vehicles
- planetary gear pins in compact transmissions
- connecting rods of small compressors where radial height is critical
- rocker arm and rocker pin pivots on camshafts
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
- 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
- At 45 mm bore, verify shaft deflection against the needle length: these rollers tolerate little edge loading, and a simply supported span between 45 mm seats can bend past the compensation range long before the load rating is exhausted.
- 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.
- Do not interchange envelope-identical needle families blindly: K 45x53x28 shares its 45×53×28 mm outline with inner-ring and sealed siblings whose ratings differ — the family letters are part of the specification, not decoration.
- The 49.5/98 kN ratings and 81 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
Which dimensions does the K 45x53x28 have?
A K 45x53x28 measures 45 mm bore/Fw × 53 mm outside diameter × 28 mm width (1.772 × 2.087 × 1.102 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 49.5 kN, static C0 98 kN, fatigue limit Pu 12.2 kN, limiting speed 10,000 r/min, reference speed 9,000 r/min, mass about 81 g.
What does K 45x53x28 mean in SKF part numbering?
K = needle roller and cage assembly (DIN 5402); the three figures give Fw 45 mm (shaft journal), E 53 mm (complement outside diameter, matched by the housing bore) and B 28 mm width. TN marks the glass fibre reinforced PA66 cage.
Does the K 45x53x28 need a hardened and ground shaft?
No. In this execution the 45 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.
What mounting mistakes ruin a K 45x53x28?
Slide the assembly over the ground 45 mm journal with a mounting sleeve, bore the housing to E 53 mm, and retain with a washer spanning the cage. Never press against the cage or rotate before the bearing is lubricated and loaded.
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.