7222B bearing: complete specifications & equivalents
The 7222B is a ISO 15 radial bearing sized 110 x 200 x 38 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 200 mm |
| Width B | 38 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 170 kN |
| Basic static load rating C0 | 144 kN |
| Fatigue load limit Pu | 8.8 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4540 g |
| Manufacturer designation | NTN 7222B |
| 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 | 4.331 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.496 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 45 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) | 23 of 36 |
| Bore above smallest 7200-series size | 100 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 7222B model number is decoded
From the medium-duty 7200 single-row family, 7222B measures 110 mm across the bore, 200 mm over the outer ring and 38 mm across the faces. Decoding 7222B: 72 is the single-row dimension series (medium-duty 7200 single-row family), with 22 encodes the 110 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). With C 170 kN and C0 144 kN, each mm of bore carries about 1.55 kN of dynamic rating. For a 110 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 3,000 r/min: fill about a third of the free space and let the bearing purge on first run.
Typical equipment & failure modes
Common applications
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox shafts
- paper-machine roll and calendar drives
- extruder and mixer gearbox output 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
- machined-cage land scoring when a high-speed spindle runs past its grease rating and the cage runs dry on its guidance surface
- flaking that starts at the raceway shoulder on the thrust-loaded side when axial load repeatedly exceeds the design share
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
Selection pitfalls — read before you substitute
- Bearings of 110 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.
- Substituting the B (40 deg) execution for the standard 30 deg bearing changes the axial/radial load split — the shaft position and the mating bearing see different forces even though the envelope is identical.
- A 7222B mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- On a 110 mm shaft, an interference fit eats internal clearance; skipping the clearance/preload recalculation is the classic cause of a new bearing running 20 deg C hotter than the drawing suggests.
- The 170/144 kN ratings and 8.8 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7222B; 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 7222B?
7222B is a single-row angular contact ball bearing to ISO 15: 110 mm bore, 200 mm outside diameter, 38 mm width (4.331 x 7.874 x 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 170 kN, C0 144 kN and a 8.8 kN fatigue load limit Pu; the grease limiting speed is 3,000 r/min and the oil rating 4,000 r/min; mass about 4540 g.
How is the 7222B designation structured?
72 is the single-row dimension series (medium-duty 7200 single-row family); 22 encodes the 110 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 200 mm OD and 38 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7222B support?
One 7222B 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 7222B?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,000 r/min and the oil rating 4,000 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 7222B?
The 110/200/38 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 170 kN / C0 144 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.