7240 bearing: complete specifications & equivalents
The 7240 is a ISO 15 radial bearing sized 200 x 360 x 58 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 200 mm |
| Outer diameter D | 360 mm |
| Width B | 58 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 375 kN |
| Basic static load rating C0 | 450 kN |
| Fatigue load limit Pu | 20.2 kN |
| Limiting speed (mechanical) | 1900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 25300 g |
| Manufacturer designation | NTN 7240 |
| 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 | 7.874 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 2.283 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 80 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) | 32 of 36 |
| Bore above smallest 7200-series size | 190 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 7240 model number is decoded
NTN 7240 belongs to the medium-duty 7200 single-row family: the catalogue boundary dimensions read 200 / 360 / 58 mm (bore / OD / width). The designation breaks down as 72 is the single-row dimension series (medium-duty 7200 single-row family); 40 encodes the 200 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 2,500 r/min sits 600 r/min above the 1,900 r/min grease figure — a 1.32x step that says how much headroom oil cooling buys. Size selection is usually finished by checking that the C0 of 450 kN covers the maximum static or shock condition with the catalogue safety factor, not only the running load. A 200 mm shaft typically takes a m6/n6 fit for rotating inner-ring load; keep the housing bore to G6/H6 class so the contact geometry is not distorted.
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
- 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
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
- 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 200 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.
- Catalogue mass and ratings belong to the open execution; shields, seals and resin cages change both the speed ceiling and the thermal behaviour of the same basic size.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 7240 without re-checking axial float, heat and housing width — the kinematics differ.
- Grease rated for deep-groove motor duty is not automatically right at 1,900 r/min with preload; check the grease speed factor against the catalogue figure.
- The 375/450 kN ratings and 20.2 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7240; 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 7240?
7240 is a single-row angular contact ball bearing to ISO 15: 200 mm bore, 360 mm outside diameter, 58 mm width (7.874 x 14.173 x 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 450 kN and a 20.2 kN fatigue load limit Pu; the grease limiting speed is 1,900 r/min and the oil rating 2,500 r/min; mass about 25300 g.
How is the 7240 designation structured?
72 is the single-row dimension series (medium-duty 7200 single-row family); 40 encodes the 200 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 58 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7240 support?
One 7240 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 7240?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 1,900 r/min and the oil rating 2,500 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 7240?
The 200/360/58 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 375 kN / C0 450 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.