5306SCLLD bearing: complete specifications & equivalents
The 5306SCLLD is a ISO 15 radial bearing sized 30 x 72 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 | 30 mm |
| Outer diameter D | 72 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 | 39 kN |
| Basic static load rating C0 | 28.7 kN |
| Fatigue load limit Pu | 1.7 kN |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 570 g |
| Manufacturer designation | NTN 5306SCLLD |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 1.189 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 21 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) | 5 of 13 |
| Bore above smallest 5300S-series size | 15 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 5306SCLLD model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 5306SCLLD appears as a heavy-duty 5300S double-row family bearing of 30 mm bore, 72 mm outside diameter and 30.2 mm width. The designation breaks down as 53 is the double-row dimension series (heavy-duty 5300S double-row family); 06 encodes the 30 mm bore (bore code x 5), and CLLD marks the SC internal design with contact rubber seals on both sides. Catalogue mass is about 570 g, which at this 21.0 mm radial section keeps the bearing comfortably inside high-speed spindle weight budgets. Against a deep-groove bearing of the same 30 mm bore, this bearing trades some pure-radial comfort for real one-direction thrust capacity and higher running accuracy. Grease quantity matters as much as grade at 5,300 r/min: fill about a third of the free space and let the bearing purge on first run.
Typical equipment & failure modes
Common applications
- agricultural gearbox and PTO shaft supports
- printing-press cylinder and folder shafts
- machine-tool spindle cartridges and driven tooling
- industrial pump and blower impeller shafts
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
- machined-cage land scoring when a high-speed spindle runs past its grease rating and the cage runs dry on its guidance surface
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
- 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 30 mm spindle at the catalogue speeds needs a calculated relubrication plan, not a calendar one.
- Sealed LLD contact-seal executions are grease-for-life: there is no relubrication path, so the grease life calculation replaces the relubrication plan.
- On a 30 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.
- Catalogue mass and ratings belong to the open execution; shields, seals and resin cages change both the speed ceiling and the thermal behaviour of the same basic size.
- 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 39/28.7 kN ratings and 1.7 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5306SCLLD; 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 5306SCLLD?
5306SCLLD is a sealed double-row angular contact ball bearing to ISO 15: 30 mm bore, 72 mm outside diameter, 30.2 mm width (1.181 x 2.835 x 1.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 39 kN, C0 28.7 kN and a 1.7 kN fatigue load limit Pu; the grease limiting speed is 5,300 r/min and no oil rating is printed for this execution; mass about 570 g.
How is the 5306SCLLD designation structured?
53 is the double-row dimension series (heavy-duty 5300S double-row family); 06 encodes the 30 mm bore (bore code x 5), and CLLD marks the SC internal design with contact rubber seals on both sides. The 72 mm OD and 30.2 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5306SCLLD support?
5306SCLLD is a sealed double-row bearing: thrust in both directions, radial and moment load in one envelope, with contact rubber seals (grease-lubricated, no oil speed rating).
What lubrication speeds does NTN print for 5306SCLLD?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 5,300 r/min and no oil rating is printed for this execution. 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 5306SCLLD?
The 30/72/30.2 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 39 kN / C0 28.7 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.