5309S bearing: complete specifications & equivalents
The 5309S is a ISO 15 radial bearing sized 45 x 100 x 39.7 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45 mm |
| Outer diameter D | 100 mm |
| Width B | 39.7 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 68.5 kN |
| Basic static load rating C0 | 51 kN |
| Fatigue load limit Pu | 3.1 kN |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1370 g |
| Manufacturer designation | NTN 5309S |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 1.563 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.5 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) | 8 of 13 |
| Bore above smallest 5300S-series size | 30 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 5309S model number is decoded
The heavy-duty 5300S double-row family entry 5309S carries a 45 mm bore in a 100 mm outside diameter, 39.7 mm wide envelope. The designation breaks down as 53 is the double-row dimension series (heavy-duty 5300S double-row family); 09 encodes the 45 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. NTN prints 68.5 kN dynamic and 51 kN static for this size and a 3.1 kN fatigue load limit Pu. Against a deep-groove bearing of the same 45 mm bore, this bearing trades some pure-radial comfort for real one-direction thrust capacity and higher running accuracy. Shaft and housing shoulders must clear the ring corners yet support enough face — the catalogue abutment diameters for the 45 mm bore give the working limits.
Typical equipment & failure modes
Common applications
- printing-press cylinder and folder shafts
- machine-tool spindle cartridges and driven tooling
- industrial pump and blower impeller shafts
- gearbox input shafts under helical-gear thrust
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
- 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 45 mm spindle at the catalogue speeds needs a calculated relubrication plan, not a calendar one.
- The double-row bearing takes reversing thrust in one envelope, but its two contact lines mean more heat than a single row at the same speed — check the thermal balance before copying a single-row speed 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.
- Do not pair two random 5309S bearings from stock and expect catalogue paired ratings — matched-set grinding is what makes DB/DF/DT preload behave, and NTN sells those as separate order numbers.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 5309S without re-checking axial float, heat and housing width — the kinematics differ.
- The 68.5/51 kN ratings and 3.1 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5309S; 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 5309S?
5309S is a double-row angular contact ball bearing to ISO 15: 45 mm bore, 100 mm outside diameter, 39.7 mm width (1.772 x 3.937 x 1.563 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 68.5 kN, C0 51 kN and a 3.1 kN fatigue load limit Pu; the grease limiting speed is 4,500 r/min and the oil rating 6,000 r/min; mass about 1370 g.
How is the 5309S designation structured?
53 is the double-row dimension series (heavy-duty 5300S double-row family); 09 encodes the 45 mm bore (bore code x 5), and the trailing S marks the current internal design of the family. The 100 mm OD and 39.7 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5309S support?
5309S is a double-row bearing working like a built-in back-to-back pair: it takes thrust in both directions plus radial load and moment (tilting) load in a single envelope.
What lubrication speeds does NTN print for 5309S?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 4,500 r/min and the oil rating 6,000 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 5309S?
The 45/100/39.7 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 68.5 kN / C0 51 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.