5206S bearing: complete specifications & equivalents
The 5206S is a ISO 15 radial bearing sized 30 x 62 x 23.8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 30 mm |
| Outer diameter D | 62 mm |
| Width B | 23.8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 29.6 kN |
| Basic static load rating C0 | 21.1 kN |
| Fatigue load limit Pu | 1.3 kN |
| Limiting speed (mechanical) | 7100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 300 g |
| Manufacturer designation | NTN 5206S |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 16 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) | 7 of 18 |
| Bore above smallest 5200S-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 5206S | 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 5206S model number is decoded
The medium-duty 5200S double-row family entry 5206S carries a 30 mm bore in a 62 mm outside diameter, 23.8 mm wide envelope. Reading the code: 52 is the double-row dimension series (medium-duty 5200S double-row family), 06 encodes the 30 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. The static margin, C0 21.1 kN versus C 29.6 kN, is what supports slow oscillating duty and shock without immediate brinelling. Where the same envelope must also be sealed, or where mounting mistakes are likely, compare with the double-row 52/53 catalogue pages before fixing the bill of materials. Grease quantity matters as much as grade at 7,100 r/min: fill about a third of the free space and let the bearing purge on first run.
Typical equipment & failure modes
Common applications
- electric motor shafts with axial locating duty
- conveyor drive and tension-drum shafts
- agricultural gearbox and PTO shaft supports
- printing-press cylinder and folder shafts
Known failure patterns
- impact brinelling dents on the 30 deg contact path after a shaft-side hammer blow during mounting, because axial shock travels straight through the contact angle
- thermal runaway from excessive preload: the pair runs hot, grease darkens and the contact ellipse spreads until the raceways smear
- machined-cage land scoring when a high-speed spindle runs past its grease rating and the cage runs dry on its guidance surface
- flaking that starts at the raceway shoulder on the thrust-loaded side when axial load repeatedly exceeds the design share
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
Selection pitfalls — read before you substitute
- In this size class the common miss is lubrication interval, not fit — a 30 mm spindle at the catalogue speeds needs a calculated relubrication plan, not a calendar one.
- 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.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 5206S without re-checking axial float, heat and housing width — the kinematics differ.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 5206S without re-checking axial float, heat and housing width — the kinematics differ.
- Do not pair two random 5206S bearings from stock and expect catalogue paired ratings — matched-set grinding is what makes DB/DF/DT preload behave, and NTN sells those as separate order numbers.
- The 29.6/21.1 kN ratings and 1.3 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5206S; 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 5206S?
5206S is a double-row angular contact ball bearing to ISO 15: 30 mm bore, 62 mm outside diameter, 23.8 mm width (1.181 x 2.441 x 0.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 29.6 kN, C0 21.1 kN and a 1.3 kN fatigue load limit Pu; the grease limiting speed is 7,100 r/min and the oil rating 9,500 r/min; mass about 300 g.
How is the 5206S designation structured?
52 is the double-row dimension series (medium-duty 5200S double-row family); 06 encodes the 30 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. The 62 mm OD and 23.8 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5206S support?
5206S 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 5206S?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 7,100 r/min and the oil rating 9,500 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 5206S?
The 30/62/23.8 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 29.6 kN / C0 21.1 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.