NKIA5913 bearing: complete specifications & equivalents
The NKIA5913 is a DIN 616 radial bearing sized 65 x 90 x 34 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 | 34 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 | NKIA 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 & NKIA-series range
| Bore d | 2.559 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 1.339 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 12.5 mm |
| Smallest bore in NKIA-series | 12 mm |
| Largest outer diameter in NKIA-series | 100 mm |
| Width range across NKIA-series | 16–40 mm |
| Bore position in NKIA-series (smallest first) | 14 of 15 |
| Bore above smallest NKIA-series size | 53 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the NKIA5913 model number is decoded
For shafts where a separate thrust bearing would lengthen the assembly, NKIA 5913 integrates needle rollers and an angular contact ball bearing: 65 mm bore, 90 mm OD, 34 mm overall width including the ball set offset. Reading the designation: the letters combine the needle roller family with the ball execution — NKIA marks angular contact — and 595913 the heavy 59 dimension series around the 65 mm bore. 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. Mounting: press on the inner ring faces only — the ball set offset (a catalogue-listed offset) makes the unit sensitive to bending; support both rings square to the 65 mm seat and never drive through the rolling elements.
Typical equipment & failure modes
Common applications
- spindle heads needing compact radial-plus-axial support
- lead-screw and ball-screw support positions
- pump rotors with hydraulic axial pull
- bevel gear shafts with moderate axial force
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
- 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.
- 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.
- Hardness is load capacity: in families without an inner ring the 65 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.
- 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.
- Do not treat the axial rating 9.96 kN (Ca) as independent of radial load: the combined equivalent load formulas couple them, and a unit sized on radial life alone will spall the ball raceway first under real thrust.
- 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
Is the NKIA 5913 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 NKIA 5913 have?
A NKIA 5913 measures 65 mm bore/Fw × 90 mm outside diameter × 34 mm width (2.559 × 3.543 × 1.339 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); angular contact geometry leans axial capacity toward one direction.
What does NKIA 5913 mean in SKF part numbering?
NKIA combines a needle roller cage with an angular contact ball bearing in one unit; 595913 gives the series and 65 mm bore. The offset (a catalogue-listed offset) positions the ball raceway inside the 34 mm overall width.
Does the NKIA 5913 need a hardened and ground shaft?
The needle roller part of the NKIA 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.
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.