7215B bearing: complete specifications & equivalents
The 7215B is a ISO 15 radial bearing sized 75 x 130 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 75 mm |
| Outer diameter D | 130 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 79 kN |
| Basic static load rating C0 | 62 kN |
| Fatigue load limit Pu | 4.5 kN |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1190 g |
| Manufacturer designation | NTN 7215B |
| 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 | 2.953 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 0.984 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.5 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) | 16 of 36 |
| Bore above smallest 7200-series size | 65 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 7215B model number is decoded
From the medium-duty 7200 single-row family, 7215B measures 75 mm across the bore, 130 mm over the outer ring and 25 mm across the faces. The designation breaks down as 72 is the single-row dimension series (medium-duty 7200 single-row family); 15 encodes the 75 mm bore (bore code x 5), and the trailing B marks the 40 deg contact-angle execution (the no-letter standard bearing works at 30 deg). On speed, the grease limiting speed is 4,500 r/min and the oil rating 6,000 r/min. For a 75 mm shaft with combined load, the practical shortlist is this series, its 7300-series heavier section, and — where thrust reverses — a back-to-back pair rather than a single row. Grease quantity matters as much as grade at 4,500 r/min: fill about a third of the free space and let the bearing purge on first run.
Typical equipment & failure modes
Common applications
- marine auxiliary and winch gearbox shafts
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox 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
- thermal runaway from excessive preload: the pair runs hot, grease darkens and the contact ellipse spreads until the raceways smear
- pressed-steel cage pocket wear and rivet loosening after repeated ball skid at light load and high speed
- 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
- Bearings of 75 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 40 deg B-execution raises axial capacity but lowers the speed ceiling — do not copy the standard-bearing speed and preload settings onto it.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 7215B without re-checking axial float, heat and housing width — the kinematics differ.
- Grease rated for deep-groove motor duty is not automatically right at 4,500 r/min with preload; check the grease speed factor against the catalogue figure.
- The C0 of 62 kN is a static rating, not a permissible running thrust — sizing continuous axial load from C0 alone is a recurring drawing-office error.
- The 79/62 kN ratings and 4.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7215B; 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 7215B?
7215B is a single-row angular contact ball bearing to ISO 15: 75 mm bore, 130 mm outside diameter, 25 mm width (2.953 x 5.118 x 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 79 kN, C0 62 kN and a 4.5 kN fatigue load limit Pu; the grease limiting speed is 4,500 r/min and the oil rating 6,000 r/min; mass about 1190 g.
How is the 7215B designation structured?
72 is the single-row dimension series (medium-duty 7200 single-row family); 15 encodes the 75 mm bore (bore code x 5), and the trailing B marks the 40 deg contact-angle execution (the no-letter standard bearing works at 30 deg). The 130 mm OD and 25 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7215B support?
One 7215B alone takes thrust in one direction only, along its 40 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 7215B?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 4,500 r/min and the oil rating 6,000 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 7215B?
The 75/130/25 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 79 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.