5303SCLLM bearing: complete specifications & equivalents
The 5303SCLLM is a ISO 15 radial bearing sized 17 x 47 x 22.2 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 | 17 mm |
| Outer diameter D | 47 mm |
| Width B | 22.2 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 19.6 kN |
| Basic static load rating C0 | 12.4 kN |
| Fatigue load limit Pu | 0.75 kN |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 180 g |
| Manufacturer designation | NTN 5303SCLLM |
| 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 | 0.669 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 0.874 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15 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) | 2 of 13 |
| Bore above smallest 5300S-series size | 2 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 5303SCLLM model number is decoded
5303SCLLM is the 17 mm bore member of NTN's heavy-duty 5300S double-row family, with a 47 mm outside diameter and 22.2 mm section width. Decoding 5303SCLLM: 53 is the double-row dimension series (heavy-duty 5300S double-row family), with 03 encodes the 17 mm bore (bore code x 5), and CLLM marks the SC internal design with non-contact rubber seals on both sides. NTN prints 19.6 kN dynamic and 12.4 kN static for this size and a 0.75 kN fatigue load limit Pu. Against a deep-groove bearing of the same 17 mm bore, this bearing trades some pure-radial comfort for real one-direction thrust capacity and higher running accuracy. A 17 mm shaft typically takes a j5/k5 fit for rotating inner-ring load; keep the housing bore to G6/H6 class so the contact geometry is not distorted.
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
- 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
- resin-cage cracking on the 7900-series sizes after hot, dry running or solvent attack on the polymer
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
Selection pitfalls — read before you substitute
- At 17 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.
- 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.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 5303SCLLM without re-checking axial float, heat and housing width — the kinematics differ.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 5303SCLLM without re-checking axial float, heat and housing width — the kinematics differ.
- The 19.6/12.4 kN ratings and 0.75 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5303SCLLM; 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 5303SCLLM?
5303SCLLM is a sealed double-row angular contact ball bearing to ISO 15: 17 mm bore, 47 mm outside diameter, 22.2 mm width (0.669 x 1.85 x 0.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 19.6 kN, C0 12.4 kN and a 0.75 kN fatigue load limit Pu; the grease limiting speed is 10,000 r/min and the oil rating 13,000 r/min; mass about 180 g.
How is the 5303SCLLM designation structured?
53 is the double-row dimension series (heavy-duty 5300S double-row family); 03 encodes the 17 mm bore (bore code x 5), and CLLM marks the SC internal design with non-contact rubber seals on both sides. The 47 mm OD and 22.2 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5303SCLLM support?
5303SCLLM 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 5303SCLLM?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 10,000 r/min and the oil rating 13,000 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 5303SCLLM?
The 17/47/22.2 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 19.6 kN / C0 12.4 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.