7952 bearing: complete specifications & equivalents
The 7952 is a ISO 15 radial bearing sized 260 x 360 x 46 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 260 mm |
| Outer diameter D | 360 mm |
| Width B | 46 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 285 kN |
| Basic static load rating C0 | 375 kN |
| Fatigue load limit Pu | 14.1 kN |
| Limiting speed (mechanical) | 1700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 14000 g |
| Manufacturer designation | NTN 7952 |
| 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 & 7900-series range
| Bore d | 10.236 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 1.811 in |
| ISO bore code | 52 |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 7900-series | 25 mm |
| Largest outer diameter in 7900-series | 420 mm |
| Width range across 7900-series | 9–56 mm |
| Bore position in 7900-series (smallest first) | 30 of 32 |
| Bore above smallest 7900-series size | 235 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 7952 | 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 7952 model number is decoded
NTN 7952 belongs to the extra-light, high-speed 7900 single-row family: the catalogue boundary dimensions read 260 / 360 / 46 mm (bore / OD / width). Decoding 7952: 79 is the single-row dimension series (extra-light, high-speed 7900 single-row family), with 52 encodes the 260 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. NTN prints 285 kN dynamic and 375 kN static for this size and a 14.1 kN fatigue load limit Pu. Size selection is usually finished by checking that the C0 of 375 kN covers the maximum static or shock condition with the catalogue safety factor, not only the running load. Mount with the thrust against the marked face: the contact angle runs from the low shoulder of the inner ring to the high shoulder of the outer ring, and reversing it throws the capacity away.
Typical equipment & failure modes
Common applications
- large fan, blower and turbo-compressor rotors
- rolling-mill backup and drive spindles
- crusher and mill pinion shafts
- large pump and turbine auxiliary 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
- resin-cage cracking on the 7900-series sizes after hot, dry running or solvent attack on the polymer
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
Selection pitfalls — read before you substitute
- At this size the shaft fit, shoulder geometry and preload procedure dominate the outcome; a 260 mm bore bearing forgives nothing in a poorly machined housing.
- The 7900 extra-light section is chosen for speed and stiffness, not for load margin — check that C0 375 kN really covers the worst static case before substituting it for a 7000.
- 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.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 7952 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 7952 without re-checking axial float, heat and housing width — the kinematics differ.
- The 285/375 kN ratings and 14.1 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7952; 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 7952?
7952 is a single-row angular contact ball bearing to ISO 15: 260 mm bore, 360 mm outside diameter, 46 mm width (10.236 x 14.173 x 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 285 kN, C0 375 kN and a 14.1 kN fatigue load limit Pu; the grease limiting speed is 1,700 r/min and the oil rating 2,200 r/min; mass about 14000 g.
How is the 7952 designation structured?
79 is the single-row dimension series (extra-light, high-speed 7900 single-row family); 52 encodes the 260 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 360 mm OD and 46 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7952 support?
One 7952 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 7952?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 1,700 r/min and the oil rating 2,200 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 7952?
The 260/360/46 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 285 kN / C0 375 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.