5212S bearing: complete specifications & equivalents
The 5212S is a ISO 15 radial bearing sized 60 x 110 x 36.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 60 mm |
| Outer diameter D | 110 mm |
| Width B | 36.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 69 kN |
| Basic static load rating C0 | 62 kN |
| Fatigue load limit Pu | 3.8 kN |
| Limiting speed (mechanical) | 3800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1330 g |
| Manufacturer designation | NTN 5212S |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.437 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 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) | 13 of 18 |
| Bore above smallest 5200S-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 5212S | 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 5212S model number is decoded
5212S 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 60 x 110 x 36.5 mm. Two fields make up the code — 52 is the double-row dimension series (medium-duty 5200S double-row family) and 12 encodes the 60 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. Catalogue mass is about 1330 g, which at this 25.0 mm radial section keeps the bearing comfortably inside high-speed spindle weight budgets. 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. Shaft and housing shoulders must clear the ring corners yet support enough face — the catalogue abutment diameters for the 60 mm bore give the working limits.
Typical equipment & failure modes
Common applications
- mining conveyor head-shaft positions
- marine auxiliary and winch gearbox shafts
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
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
- machined-cage land scoring when a high-speed spindle runs past its grease rating and the cage runs dry on its guidance surface
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
Selection pitfalls — read before you substitute
- Bearings of 60 mm bore arrive heavy enough that handling damage (dents from slings, tilting on the shaft) is a real failure precursor — use proper lifting and heating kit.
- 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 5212S without re-checking axial float, heat and housing width — the kinematics differ.
- Do not pair two random 5212S 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.
- 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.
- The 69/62 kN ratings and 3.8 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5212S; 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 5212S?
5212S is a double-row angular contact ball bearing to ISO 15: 60 mm bore, 110 mm outside diameter, 36.5 mm width (2.362 x 4.331 x 1.437 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 69 kN, C0 62 kN and a 3.8 kN fatigue load limit Pu; the grease limiting speed is 3,800 r/min and the oil rating 5,000 r/min; mass about 1330 g.
How is the 5212S designation structured?
52 is the double-row dimension series (medium-duty 5200S double-row family); 12 encodes the 60 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. The 110 mm OD and 36.5 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5212S support?
5212S 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 5212S?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,800 r/min and the oil rating 5,000 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 5212S?
The 60/110/36.5 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 69 kN / C0 62 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.