5205S bearing: complete specifications & equivalents
The 5205S is a ISO 15 radial bearing sized 25 x 52 x 20.6 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 25 mm |
| Outer diameter D | 52 mm |
| Width B | 20.6 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 21.3 kN |
| Basic static load rating C0 | 14.7 kN |
| Fatigue load limit Pu | 0.88 kN |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 180 g |
| Manufacturer designation | NTN 5205S |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 5200S-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.811 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 5200S-series | 10 mm |
| Largest outer diameter in 5200S-series | 150 mm |
| Width range across 5200S-series | 14.3–49.2 mm |
| Bore position in 5200S-series (smallest first) | 6 of 18 |
| Bore above smallest 5200S-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 5205S | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 5205S model number is decoded
5205S is an NTN double-row angular contact ball bearing: medium-duty 5200S double-row family, listed in NTN Ball and Roller Bearings CAT.No.2203E at 25 x 52 x 20.6 mm. NTN builds the number from 52 is the double-row dimension series (medium-duty 5200S double-row family), then 05 encodes the 25 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. On speed, the grease limiting speed is 8,500 r/min and the oil rating 11,000 r/min. For a 25 mm shaft with combined load, the practical shortlist is this series, its neighbouring dimension series, and — where thrust reverses — a back-to-back pair rather than a single row. Set preload or end-play with the pair as a unit and lock the adjustment; a single angular-contact bearing cannot run free like a deep-groove one.
Typical equipment & failure modes
Common applications
- small pump and compressor shafts with combined load
- servo and stepper motor shafts with axial preload
- bicycle and motorcycle wheel and steering positions
- small gearbox pinion shafts with helical gears
Known failure patterns
- false brinelling on the raceway contact ellipses when a preloaded spindle sits vibrating at standstill — visible as evenly spaced flute-like wear at ball pitch
- loss of preload after housing-fret or shaft creep, leaving the pair loose — ball skidding, cage rattle and a falling natural frequency follow
- resin-cage cracking on the 7900-series sizes after hot, dry running or solvent attack on the polymer
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
- flaking that starts at the raceway shoulder on the thrust-loaded side when axial load repeatedly exceeds the design share
Selection pitfalls — read before you substitute
- At 25 mm bore the rings are thin-sectioned: press force must go through the ring being fitted, never through the balls, or the first damage is already in the raceway before the machine runs.
- The double-row bearing takes reversing thrust in one envelope, but its two contact lines mean more heat than a single row at the same speed — check the thermal balance before copying a single-row speed figure.
- If the application vibrates at standstill (transport, idle machine next to a running line), specify protection: the contact ellipse of a preloaded bearing false-brinells faster than a loose one.
- Grease rated for deep-groove motor duty is not automatically right at 8,500 r/min with preload; check the grease speed factor against the catalogue figure.
- The C0 of 14.7 kN is a static rating, not a permissible running thrust — sizing continuous axial load from C0 alone is a recurring drawing-office error.
- The 21.3/14.7 kN ratings and 0.88 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5205S; internal geometry legitimately differs between manufacturers, so re-verify ratings, contact angle and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 5205S?
5205S is a double-row angular contact ball bearing to ISO 15: 25 mm bore, 52 mm outside diameter, 20.6 mm width (0.984 x 2.047 x 0.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21.3 kN, C0 14.7 kN and a 0.88 kN fatigue load limit Pu; the grease limiting speed is 8,500 r/min and the oil rating 11,000 r/min; mass about 180 g.
How is the 5205S designation structured?
52 is the double-row dimension series (medium-duty 5200S double-row family); 05 encodes the 25 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. The 52 mm OD and 20.6 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5205S support?
5205S is a double-row bearing working like a built-in back-to-back pair: it takes thrust in both directions plus radial load and moment (tilting) load in a single envelope.
What lubrication speeds does NTN print for 5205S?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 8,500 r/min and the oil rating 11,000 r/min. These are catalogue ceilings for a correctly mounted bearing with the stated lubricant; preload, fill quantity, ambient heat and paired arrangements all move the real limit.
What should be checked before substituting another make for 5205S?
The 25/52/20.6 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 21.3 kN / C0 14.7 kN, the speed figures, contact angle and suffix meaning against the donor catalogue before swapping on a rated drive.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.