5308SCLLM bearing: complete specifications & equivalents
The 5308SCLLM is a ISO 15 radial bearing sized 40 x 90 x 36.5 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 | 90 mm |
| Width B | 36.5 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 49.5 kN |
| Basic static load rating C0 | 38 kN |
| Fatigue load limit Pu | 2.3 kN |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1040 g |
| Manufacturer designation | NTN 5308SCLLM |
| 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 | 1.575 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 1.437 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 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) | 7 of 13 |
| Bore above smallest 5300S-series size | 25 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 5308SCLLM model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 5308SCLLM appears as a heavy-duty 5300S double-row family bearing of 40 mm bore, 90 mm outside diameter and 36.5 mm width. NTN builds the number from 53 is the double-row dimension series (heavy-duty 5300S double-row family), then 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. Catalogue mass is about 1040 g, which at this 25.0 mm radial section keeps the bearing comfortably inside high-speed spindle weight budgets. When axial load reverses, specify the bearing as a matched pair (DB, DF or DT) instead of two random singles — the catalogue right-hand columns give the paired ratings for exactly this reason. Set preload or end-play with the pair as a unit and lock the adjustment; a single angular-contact bearing cannot run free like a deep-groove one.
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
- 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
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
- flaking that starts at the raceway shoulder on the thrust-loaded side when axial load repeatedly exceeds the design share
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.
- Grease rated for deep-groove motor duty is not automatically right at 5,300 r/min with preload; check the grease speed factor against the catalogue figure.
- Grease rated for deep-groove motor duty is not automatically right at 5,300 r/min with preload; check the grease speed factor against the catalogue figure.
- If the application vibrates at standstill (transport, idle machine next to a running line), specify protection: the contact ellipse of a preloaded bearing false-brinells faster than a loose one.
- The 49.5/38 kN ratings and 2.3 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5308SCLLM; 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 5308SCLLM?
5308SCLLM is a sealed double-row angular contact ball bearing to ISO 15: 40 mm bore, 90 mm outside diameter, 36.5 mm width (1.575 x 3.543 x 1.437 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49.5 kN, C0 38 kN and a 2.3 kN fatigue load limit Pu; the grease limiting speed is 5,300 r/min and the oil rating 6,700 r/min; mass about 1040 g.
How is the 5308SCLLM designation structured?
53 is the double-row dimension series (heavy-duty 5300S 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 90 mm OD and 36.5 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5308SCLLM support?
5308SCLLM 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 5308SCLLM?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 5,300 r/min and the oil rating 6,700 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 5308SCLLM?
The 40/90/36.5 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 49.5 kN / C0 38 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.