NKIB5913 bearing: complete specifications & equivalents
The NKIB5913 is a DIN 616 radial bearing sized 65 x 90 x 38 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 65 mm |
| Outer diameter D | 90 mm |
| Width B | 38 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 61.6 kN |
| Basic static load rating C0 | 120 kN |
| Fatigue load limit Pu | 14.6 kN |
| Reference speed (thermal) | 5600 rpm |
| Limiting speed (mechanical) | 6300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 640 g |
| Manufacturer designation | NKIB 5913 |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings); 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 & NKIB-series range
| Bore d | 2.559 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 1.496 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 12.5 mm |
| Smallest bore in NKIB-series | 12 mm |
| Largest outer diameter in NKIB-series | 100 mm |
| Width range across NKIB-series | 17.5–45 mm |
| Bore position in NKIB-series (smallest first) | 14 of 15 |
| Bore above smallest NKIB-series size | 53 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the NKIB5913 model number is decoded
NKIB 5913 solves compact radial-plus-thrust duty: a needle roller cage and an three-point contact ball bearing built into one 38 mm wide unit with a 65 mm bore and 90 mm outside diameter. The designation NKIB 5913 identifies the two rolling elements in one unit; the 65 mm bore and 90 mm OD come from the 59-series plan, and the 38 mm width stacks roller set plus ball set. The combined unit is greased for life at assembly in many applications; relubrication, where provided, must reach both the roller cage and the ball set through the same axial bore features. Selection arithmetic for the combined unit: radial C 61.6 kN, radial C0 120 kN, axial dynamic 9.96 kN (Ca) and axial static 19.2 kN (C0a); combine them with the equivalent-load factors from the catalogue before checking L10. Fit the combined unit so the ball raceway offset faces the working axial load, check rotation in both directions, and preload if required with the washer stack the catalogue recommends.
Typical equipment & failure modes
Common applications
- gearbox main shafts carrying radial plus one-direction thrust
- worm gear shafts with axial reaction toward the worm
- spindle heads needing compact radial-plus-axial support
- lead-screw and ball-screw support positions
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after overload events
- cage pocket wear and roller skew after sustained operation with too little radial preload
- grease starvation at the roller ends when relubrication intervals are stretched in dirty duty
- false brinelling of standby equipment under external vibration
- thrust-part ball or roller skidding and smearing when the axial load falls below the minimum factor
Selection pitfalls — read before you substitute
- Above 50 mm bore, thermal growth matters: the 65 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.
- Do not interchange envelope-identical needle families blindly: NKIB 5913 shares its 65×90×38 mm outline with inner-ring and sealed siblings whose ratings differ — the family letters are part of the specification, not decoration.
- Reference and limiting speeds are different limits: the 5,600 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.
- Minimum axial load is a real requirement: below the catalogue minimum the thrust elements skid, polish their raceways and lose them — springs or preload washers belong in the arrangement drawing, not the troubleshooting notes.
- Height stack-up is easy to mis-check: the ball-raceway part adds height beyond a plain needle bearing, and clamping the stack solid over it preloads the thrust set beyond its rating.
- The 61.6/120 kN ratings and 640 g mass are SKF catalogue values transcribed from ch. 7.7 of PUB BU/P1 17000 (PDF table page 654); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
What are the dimensions and ratings of the NKIB 5913?
A NKIB 5913 measures 65 mm bore/Fw × 90 mm outside diameter × 38 mm width (2.559 × 3.543 × 1.496 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 61.6 kN, static C0 120 kN, fatigue limit Pu 14.6 kN, limiting speed 6,300 r/min, reference speed 5,600 r/min, mass about 640 g. Axial ratings of the ball part: dynamic Ca 9.96 kN (Ca), static C0a 19.2 kN (C0a); three-point contact geometry accepts axial load in both directions.
How is the NKIB 5913 designation read?
NKIB combines a needle roller cage with an three-point contact ball bearing in one unit; 595913 gives the series and 65 mm bore. The offset (s 34 mm) positions the ball raceway inside the 38 mm overall width.
Can the NKIB 5913 run on an unhardened shaft?
The needle roller part of the NKIB 5913 rides directly on the 65 mm journal, so it must be hardened to 58–64 HRC and ground; the ball set runs on its own integrated raceways. There is no inner-ring variant — harden the shaft or move to a separate bearing arrangement.
How should the NKIB 5913 be mounted?
Press on the ring faces only with a fitting sleeve, keep everything square to the 65 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.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings on 2026-09-26. Read our editorial & correction policy.