7212-NTN bearing: complete specifications & equivalents
The 7212-NTN is a ISO 15 radial bearing sized 60 x 110 x 22 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 | 22 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 68.5 kN |
| Basic static load rating C0 | 49 kN |
| Fatigue load limit Pu | 3.85 kN |
| Limiting speed (mechanical) | 6600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 765 g |
| Manufacturer designation | NTN 7212 |
| 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 & 7200-series range
| Bore d | 2.362 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 0.866 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in 7200-series | 10 mm |
| Largest outer diameter in 7200-series | 540 mm |
| Width range across 7200-series | 9–85 mm |
| Bore position in 7200-series (smallest first) | 13 of 36 |
| Bore above smallest 7200-series size | 50 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 7212-NTN model number is decoded
7212 is the 60 mm bore member of NTN's medium-duty 7200 single-row family, with a 110 mm outside diameter and 22 mm section width. NTN builds the number from 72 is the single-row dimension series (medium-duty 7200 single-row family), then 12 encodes the 60 mm bore (bore code x 5); with no letter after the digits it is the standard 30 deg contact-angle execution — the 40 deg version carries a B. Because the contact line is angled, one bearing of this type takes radial load plus thrust from one direction only — the opposite direction needs a second bearing or a matched set. Against a deep-groove bearing of the same 60 mm bore, this bearing trades some pure-radial comfort for real one-direction thrust capacity and higher running accuracy. Grease quantity matters as much as grade at 6,600 r/min: fill about a third of the free space and let the bearing purge on first run.
Typical equipment & failure modes
Common applications
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox shafts
- paper-machine roll and calendar drives
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
- pressed-steel cage pocket wear and rivet loosening after repeated ball skid at light load and high speed
- flaking that starts at the raceway shoulder on the thrust-loaded side when axial load repeatedly exceeds the design share
- 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
- 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 standard 30 deg bearing and its B (40 deg) sibling share the envelope; picking between them is a load-direction decision, not a quality upgrade.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 7212 without re-checking axial float, heat and housing width — the kinematics differ.
- A single-row angular contact left loose on the shaft to "help assembly" will fret the seat: the contact angle keeps driving the ring axially under load.
- The 6,600 r/min speed figure assumes the catalogue lubrication state and a correctly set pair; real limits drop fast with excess grease fill or heavy preload.
- The 68.5/49 kN ratings and 3.85 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7212; 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 7212?
7212 is a single-row angular contact ball bearing to ISO 15: 60 mm bore, 110 mm outside diameter, 22 mm width (2.362 x 4.331 x 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 68.5 kN, C0 49 kN and a 3.85 kN fatigue load limit Pu; the grease limiting speed is 6,600 r/min and the oil rating 8,800 r/min; mass about 765 g.
How is the 7212 designation structured?
72 is the single-row dimension series (medium-duty 7200 single-row family); 12 encodes the 60 mm bore (bore code x 5); with no letter after the digits it is the standard 30 deg contact-angle execution — the 40 deg version carries a B. The 110 mm OD and 22 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7212 support?
One 7212 alone takes thrust in one direction only, along its 30 deg contact angle; reversing thrust calls for a second bearing or a factory-matched DB/DF/DT pair (the catalogue right-hand columns list the paired ratings). Radial load is always carried as a combined load through the angled contact.
What lubrication speeds does NTN print for 7212?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 6,600 r/min and the oil rating 8,800 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 7212?
The 60/110/22 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 68.5 kN / C0 49 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.