5205SCLLM bearing: complete specifications & equivalents
The 5205SCLLM is a ISO 15 radial bearing sized 25 x 52 x 20.6 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 25 mm |
| Outer diameter D | 52 mm |
| Width B | 20.6 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 16.9 kN |
| Basic static load rating C0 | 12.3 kN |
| Fatigue load limit Pu | 0.74 kN |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 180 g |
| Manufacturer designation | NTN 5205SCLLM |
| 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 & 5200S-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.811 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 5200S-series | 10 mm |
| Largest outer diameter in 5200S-series | 150 mm |
| Width range across 5200S-series | 14.3–49.2 mm |
| Bore position in 5200S-series (smallest first) | 6 of 18 |
| Bore above smallest 5200S-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 5205SCLLM | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting. |
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 5205SCLLM model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 5205SCLLM appears as a medium-duty 5200S double-row family bearing of 25 mm bore, 52 mm outside diameter and 20.6 mm width. Reading the code: 52 is the double-row dimension series (medium-duty 5200S double-row family), 05 encodes the 25 mm bore (bore code x 5), and CLLM marks the SC internal design with non-contact rubber seals on both sides. The oil rating of 11,000 r/min sits 2,500 r/min above the 8,500 r/min grease figure — a 1.29x step that says how much headroom oil cooling buys. For a 25 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. 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
- 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
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
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 LLM non-contact-seal executions are grease-for-life: there is no relubrication path, so the grease life calculation replaces the relubrication plan.
- On a 25 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.
- On a 25 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.
- Grease rated for deep-groove motor duty is not automatically right at 8,500 r/min with preload; check the grease speed factor against the catalogue figure.
- The 16.9/12.3 kN ratings and 0.74 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5205SCLLM; 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 5205SCLLM?
5205SCLLM is a sealed double-row angular contact ball bearing to ISO 15: 25 mm bore, 52 mm outside diameter, 20.6 mm width (0.984 x 2.047 x 0.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16.9 kN, C0 12.3 kN and a 0.74 kN fatigue load limit Pu; the grease limiting speed is 8,500 r/min and the oil rating 11,000 r/min; mass about 180 g.
How is the 5205SCLLM designation structured?
52 is the double-row dimension series (medium-duty 5200S double-row family); 05 encodes the 25 mm bore (bore code x 5), and CLLM marks the SC internal design with non-contact rubber seals on both sides. The 52 mm OD and 20.6 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5205SCLLM support?
5205SCLLM is a sealed double-row bearing: thrust in both directions, radial and moment load in one envelope, with non-contact rubber seals that keep the shield-level speed ratings.
What lubrication speeds does NTN print for 5205SCLLM?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 8,500 r/min and the oil rating 11,000 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 5205SCLLM?
The 25/52/20.6 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 16.9 kN / C0 12.3 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.