5305SCZZ bearing: complete specifications & equivalents
The 5305SCZZ is a ISO 15 radial bearing sized 25 x 62 x 25.4 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 | 25 mm |
| Outer diameter D | 62 mm |
| Width B | 25.4 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 25.2 kN |
| Basic static load rating C0 | 18.2 kN |
| Fatigue load limit Pu | 1.1 kN |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 360 g |
| Manufacturer designation | NTN 5305SCZZ |
| 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 | 0.984 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 1 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.5 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) | 4 of 13 |
| Bore above smallest 5300S-series size | 10 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 5305SCZZ model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 5305SCZZ appears as a heavy-duty 5300S double-row family bearing of 25 mm bore, 62 mm outside diameter and 25.4 mm width. The designation breaks down as 53 is the double-row dimension series (heavy-duty 5300S double-row family); 05 encodes the 25 mm bore (bore code x 5), and CZZ marks the double-row SC internal design with pressed-steel shields on both sides. The radial section height here is 18.5 mm, and the catalogue couples that with C 25.2 kN / C0 18.2 kN. Where the same envelope must also be sealed, or where mounting mistakes are likely, compare with the double-row 52/53 catalogue pages before fixing the bill of materials. 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
- precision instrument and encoder support shafts
- small machine-tool spindle and live-centre positions
- high-speed router, grinder and woodworking spindles
- small pump and compressor shafts with combined load
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
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
- 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 25 mm bore the rings are thin-sectioned: press force must go through the ring being fitted, never through the balls, or the first damage is already in the raceway before the machine runs.
- Sealed ZZ shielded executions are grease-for-life: there is no relubrication path, so the grease life calculation replaces the relubrication plan.
- The 7,500 r/min speed figure assumes the catalogue lubrication state and a correctly set pair; real limits drop fast with excess grease fill or heavy preload.
- 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 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.
- The 25.2/18.2 kN ratings and 1.1 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5305SCZZ; 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 5305SCZZ?
5305SCZZ is a sealed double-row angular contact ball bearing to ISO 15: 25 mm bore, 62 mm outside diameter, 25.4 mm width (0.984 x 2.441 x 1 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 25.2 kN, C0 18.2 kN and a 1.1 kN fatigue load limit Pu; the grease limiting speed is 7,500 r/min and the oil rating 10,000 r/min; mass about 360 g.
How is the 5305SCZZ designation structured?
53 is the double-row dimension series (heavy-duty 5300S double-row family); 05 encodes the 25 mm bore (bore code x 5), and CZZ marks the double-row SC internal design with pressed-steel shields on both sides. The 62 mm OD and 25.4 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5305SCZZ support?
5305SCZZ 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 5305SCZZ?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 7,500 r/min and the oil rating 10,000 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 5305SCZZ?
The 25/62/25.4 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 25.2 kN / C0 18.2 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.