5208SCLLM bearing: complete specifications & equivalents
The 5208SCLLM is a ISO 15 radial bearing sized 40 x 80 x 30.2 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 | 40 mm |
| Outer diameter D | 80 mm |
| Width B | 30.2 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 36.5 kN |
| Basic static load rating C0 | 29 kN |
| Fatigue load limit Pu | 1.7 kN |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 630 g |
| Manufacturer designation | NTN 5208SCLLM |
| 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 | 1.575 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 1.189 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20 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) | 9 of 18 |
| Bore above smallest 5200S-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 5208SCLLM | 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 5208SCLLM model number is decoded
From the medium-duty 5200S double-row family, 5208SCLLM measures 40 mm across the bore, 80 mm over the outer ring and 30.2 mm across the faces. The designation breaks down as 52 is the double-row dimension series (medium-duty 5200S double-row family); 08 encodes the 40 mm bore (bore code x 5), and CLLM marks the SC internal design with non-contact rubber seals on both sides. Because the contact line is angled, one bearing of this type takes radial load plus thrust from one direction only — the opposite direction needs a second bearing or a matched set. Choose the medium-duty 5200S double-row family when the shaft needs a stiff locating support and the axial component is known to act mostly one way. 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
- machine-tool spindle cartridges and driven tooling
- industrial pump and blower impeller shafts
- gearbox input shafts under helical-gear thrust
- electric motor shafts with axial locating duty
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
- 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
- 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
- In this size class the common miss is lubrication interval, not fit — a 40 mm spindle at the catalogue speeds needs a calculated relubrication plan, not a calendar one.
- Sealed LLM non-contact-seal executions are grease-for-life: there is no relubrication path, so the grease life calculation replaces the relubrication plan.
- A 5208SCLLM mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- Grease rated for deep-groove motor duty is not automatically right at 5,600 r/min with preload; check the grease speed factor against the catalogue figure.
- The 5,600 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.
- The 36.5/29 kN ratings and 1.7 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5208SCLLM; 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 5208SCLLM?
5208SCLLM is a sealed double-row angular contact ball bearing to ISO 15: 40 mm bore, 80 mm outside diameter, 30.2 mm width (1.575 x 3.15 x 1.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 36.5 kN, C0 29 kN and a 1.7 kN fatigue load limit Pu; the grease limiting speed is 5,600 r/min and the oil rating 7,100 r/min; mass about 630 g.
How is the 5208SCLLM designation structured?
52 is the double-row dimension series (medium-duty 5200S double-row family); 08 encodes the 40 mm bore (bore code x 5), and CLLM marks the SC internal design with non-contact rubber seals on both sides. The 80 mm OD and 30.2 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5208SCLLM support?
5208SCLLM 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 5208SCLLM?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 5,600 r/min and the oil rating 7,100 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 5208SCLLM?
The 40/80/30.2 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 36.5 kN / C0 29 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.