K4X7X10-TN bearing: complete specifications & equivalents
The K4X7X10-TN is a DIN 5402 radial bearing sized 4 x 7 x 10 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 4 mm |
| Outer diameter D | 7 mm |
| Width B | 10 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 2.29 kN |
| Basic static load rating C0 | 1.9 kN |
| Fatigue load limit Pu | 0.204 kN |
| Reference speed (thermal) | 36000 rpm |
| Limiting speed (mechanical) | 43000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 0.7 g |
| Manufacturer designation | K 4x7x10 TN |
| 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 | 0.157 in |
|---|---|
| Outer diameter D | 0.276 in |
| Width B | 0.394 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 1.5 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) | 2 of 22 |
| Bore above smallest K-series size | 1 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the K4X7X10-TN model number is decoded
K 4x7x10 TN is a caged needle roller set, not a complete bearing: paired with a 58–64 HRC ground journal of 4 mm and a housing bore of 7 mm, it forms a full rolling bearing with the smallest possible radial space demand. In the K code K 4x7x10 TN, Fw×E×B reads directly as journal 4 mm, complement diameter 7 mm and cage width 10 mm; the housing bore is ground to E with H6/H7 tolerance to complete the outer raceway. 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. Catalogue mass 0.7 g at 4×7×10 mm makes this one of the highest capacity-per-gram choices in the needle roller and cage assemblies; the limit is usually the shaft's ability to serve as a raceway, not the rolling contact itself. Mounting: grind the 4 mm journal to the catalogue raceway tolerance after hardening to 58–64 HRC, bore the housing to E 7 mm H6, and slide the assembly in axially — pressing through the cage distorts it and locks the rollers.
Typical equipment & failure modes
Common applications
- planetary gear pins in compact transmissions
- connecting rods of small compressors where radial height is critical
- rocker arm and rocker pin pivots on camshafts
- pump and gearbox idler gears running on hardened pins
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after overload events
- 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
- At Fw 4 mm the rolling elements are under two millimetres long — handle the K 4x7x10 TN like a watch part: one dropped assembly, one over-pressed cup or one coarse journal finish outweighs any catalogue rating difference.
- Hardness is load capacity: in families without an inner ring the 4 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 quoted 2.29/1.9 kN ratings are SKF catalogue values for this exact execution (K 4x7x10 TN); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- The 2.29/1.9 kN ratings and 0.7 g mass are SKF catalogue values transcribed from ch. 7.1 of PUB BU/P1 17000 (PDF table page 616); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
What limits the service life of a K 4x7x10 TN?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 4 mm seat, lubricant condition at the roller ends, and contamination through open ends — the 1.5 mm radial section leaves no reserve once a raceway is dented or ribboned.
What are the dimensions and ratings of the K 4x7x10 TN?
A K 4x7x10 TN measures 4 mm bore/Fw × 7 mm outside diameter × 10 mm width (0.157 × 0.276 × 0.394 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 2.29 kN, static C0 1.9 kN, fatigue limit Pu 0.204 kN, limiting speed 43,000 r/min, reference speed 36,000 r/min, mass about 0.7 g.
How is the K 4x7x10 TN designation read?
K = needle roller and cage assembly (DIN 5402); the three figures give Fw 4 mm (shaft journal), E 7 mm (complement outside diameter, matched by the housing bore) and B 10 mm width. TN marks the glass fibre reinforced PA66 cage.
Can the K 4x7x10 TN run on an unhardened shaft?
No. In this execution the 4 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.