5306SCZZ bearing: complete specifications & equivalents
The 5306SCZZ is a ISO 15 radial bearing sized 30 x 72 x 30.2 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 30 mm |
| Outer diameter D | 72 mm |
| Width B | 30.2 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 39 kN |
| Basic static load rating C0 | 28.7 kN |
| Fatigue load limit Pu | 1.7 kN |
| Limiting speed (mechanical) | 6300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 570 g |
| Manufacturer designation | NTN 5306SCZZ |
| 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 & 5300S-series range
| Bore d | 1.181 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 1.189 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 21 mm |
| Smallest bore in 5300S-series | 15 mm |
| Largest outer diameter in 5300S-series | 150 mm |
| Width range across 5300S-series | 19–63.5 mm |
| Bore position in 5300S-series (smallest first) | 5 of 13 |
| Bore above smallest 5300S-series size | 15 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 5306SCZZ model number is decoded
NTN 5306SCZZ belongs to the heavy-duty 5300S double-row family: the catalogue boundary dimensions read 30 / 72 / 30.2 mm (bore / OD / width). Two fields make up the code — 53 is the double-row dimension series (heavy-duty 5300S double-row family) and 06 encodes the 30 mm bore (bore code x 5), and CZZ marks the double-row SC internal design with pressed-steel shields on both sides. The built-in back-to-back contact lines give the double-row bearing its two-direction thrust and moment capacity from one ring set. For a 30 mm shaft with combined load, the practical shortlist is this series, its neighbouring dimension series, and — where thrust reverses — a back-to-back pair rather than a single row. After mounting, check axial float or preload with a dial gauge on the shaft end — the specification, not hand feel, decides whether the contact angle works as rated.
Typical equipment & failure modes
Common applications
- industrial pump and blower impeller shafts
- gearbox input shafts under helical-gear thrust
- electric motor shafts with axial locating duty
- conveyor drive and tension-drum 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
- 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
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
Selection pitfalls — read before you substitute
- In this size class the common miss is lubrication interval, not fit — a 30 mm spindle at the catalogue speeds needs a calculated relubrication plan, not a calendar one.
- Sealed ZZ shielded executions are grease-for-life: there is no relubrication path, so the grease life calculation replaces the relubrication plan.
- Grease rated for deep-groove motor duty is not automatically right at 6,300 r/min with preload; check the grease speed factor against the catalogue figure.
- Do not pair two random 5306SCZZ bearings from stock and expect catalogue paired ratings — matched-set grinding is what makes DB/DF/DT preload behave, and NTN sells those as separate order numbers.
- A 5306SCZZ mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- The 39/28.7 kN ratings and 1.7 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5306SCZZ; 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 5306SCZZ?
5306SCZZ is a sealed double-row angular contact ball bearing to ISO 15: 30 mm bore, 72 mm outside diameter, 30.2 mm width (1.181 x 2.835 x 1.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 39 kN, C0 28.7 kN and a 1.7 kN fatigue load limit Pu; the grease limiting speed is 6,300 r/min and the oil rating 8,500 r/min; mass about 570 g.
How is the 5306SCZZ designation structured?
53 is the double-row dimension series (heavy-duty 5300S double-row family); 06 encodes the 30 mm bore (bore code x 5), and CZZ marks the double-row SC internal design with pressed-steel shields on both sides. The 72 mm OD and 30.2 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5306SCZZ support?
5306SCZZ is a sealed double-row bearing: thrust in both directions, radial and moment load in one envelope, with pressed-steel shields that keep the open-bearing speed ratings.
What lubrication speeds does NTN print for 5306SCZZ?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 6,300 r/min and the oil rating 8,500 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 5306SCZZ?
The 30/72/30.2 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 39 kN / C0 28.7 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.