5303S bearing: complete specifications & equivalents
The 5303S is a ISO 15 radial bearing sized 17 x 47 x 22.2 mm (bore x OD x width). 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 | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 21 kN |
| Basic static load rating C0 | 12.6 kN |
| Fatigue load limit Pu | 0.77 kN |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 180 g |
| Manufacturer designation | NTN 5303S |
| 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 5303S model number is decoded
From the heavy-duty 5300S double-row family, 5303S measures 17 mm across the bore, 47 mm over the outer ring and 22.2 mm across the faces. Decoding 5303S: 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 the trailing S marks the current internal design of the family. At roughly 15.0 mm of radial section, the catalogue still quotes 21 kN dynamic capacity for the 17 mm bore. Where the same envelope must also be sealed, or where mounting mistakes are likely, compare with the double-row 52/53 catalogue pages before fixing the bill of materials. 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
- small machine-tool spindle and live-centre positions
- high-speed router, grinder and woodworking spindles
- small pump and compressor shafts with combined load
- servo and stepper motor shafts with axial preload
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
- flaking that starts at the raceway shoulder on the thrust-loaded side when axial load repeatedly exceeds the design share
- 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.
- 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.
- A single-row angular contact left loose on the shaft to "help assembly" will fret the seat: the contact angle keeps driving the ring axially under load.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 5303S without re-checking axial float, heat and housing width — the kinematics differ.
- 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.
- The 21/12.6 kN ratings and 0.77 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 5303S; 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 5303S?
5303S is a 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 21 kN, C0 12.6 kN and a 0.77 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 5303S 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 the trailing S marks the current internal design of the family. The 47 mm OD and 22.2 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 5303S support?
5303S 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 5303S?
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 5303S?
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 21 kN / C0 12.6 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.