7232 bearing: complete specifications & equivalents
The 7232 is a ISO 15 radial bearing sized 160 x 290 x 48 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 160 mm |
| Outer diameter D | 290 mm |
| Width B | 48 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 291 kN |
| Basic static load rating C0 | 305 kN |
| Fatigue load limit Pu | 15.8 kN |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 13700 g |
| Manufacturer designation | NTN 7232 |
| 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 | 6.299 in |
|---|---|
| Outer diameter D | 11.417 in |
| Width B | 1.89 in |
| ISO bore code | 32 |
| Radial section height (D−d)/2 | 65 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) | 28 of 36 |
| Bore above smallest 7200-series size | 150 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 7232 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 7232 appears as a medium-duty 7200 single-row family bearing of 160 mm bore, 290 mm outside diameter and 48 mm width. The designation breaks down as 72 is the single-row dimension series (medium-duty 7200 single-row family); 32 encodes the 160 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 oil rating of 3,200 r/min sits 800 r/min above the 2,400 r/min grease figure — a 1.33x step that says how much headroom oil cooling buys. Selection starts from the thrust share: as axial load grows past roughly half the radial load, an angular-contact position of this section usually outlives a deep-groove one. Heat-mounting to 80-90 deg C is the clean route onto a 160 mm shaft; drive-fits through the balls transmit force through the contact ellipse and can brinell it.
Typical equipment & failure modes
Common applications
- large pump and turbine auxiliary shafts
- steel-plant conveyor and table roll drives
- wind-turbine and heavy-machinery auxiliaries
- heavy industrial gearbox main 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
- 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
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
Selection pitfalls — read before you substitute
- At this size the shaft fit, shoulder geometry and preload procedure dominate the outcome; a 160 mm bore bearing forgives nothing in a poorly machined housing.
- 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 7232 without re-checking axial float, heat and housing width — the kinematics differ.
- 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 2,400 r/min with preload; check the grease speed factor against the catalogue figure.
- The 291/305 kN ratings and 15.8 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7232; 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 7232?
7232 is a single-row angular contact ball bearing to ISO 15: 160 mm bore, 290 mm outside diameter, 48 mm width (6.299 x 11.417 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 305 kN and a 15.8 kN fatigue load limit Pu; the grease limiting speed is 2,400 r/min and the oil rating 3,200 r/min; mass about 13700 g.
How is the 7232 designation structured?
72 is the single-row dimension series (medium-duty 7200 single-row family); 32 encodes the 160 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 290 mm OD and 48 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7232 support?
One 7232 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 7232?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 2,400 r/min and the oil rating 3,200 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 7232?
The 160/290/48 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 291 kN / C0 305 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.