7913 bearing: complete specifications & equivalents
The 7913 is a ISO 15 radial bearing sized 65 x 90 x 13 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 90 mm |
| Width B | 13 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 20.2 kN |
| Basic static load rating C0 | 18 kN |
| Fatigue load limit Pu | 1.2 kN |
| Limiting speed (mechanical) | 7200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 245 g |
| Manufacturer designation | NTN 7913 |
| 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 & 7900-series range
| Bore d | 2.559 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.512 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 12.5 mm |
| Smallest bore in 7900-series | 25 mm |
| Largest outer diameter in 7900-series | 420 mm |
| Width range across 7900-series | 9–56 mm |
| Bore position in 7900-series (smallest first) | 9 of 32 |
| Bore above smallest 7900-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 7913 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 7913 model number is decoded
7913 is the 65 mm bore member of NTN's extra-light, high-speed 7900 single-row family, with a 90 mm outside diameter and 13 mm section width. Reading the code: 79 is the single-row dimension series (extra-light, high-speed 7900 single-row family), 13 encodes the 65 mm bore (bore code x 5); with no letter after the digits it is the standard 30 deg contact-angle execution — the 40 deg version carries a B. The 30 deg contact angle is the lever that turns the 18 kN static rating into useful one-direction thrust capacity. Against a deep-groove bearing of the same 65 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 65 mm bore give the working limits.
Typical equipment & failure modes
Common applications
- marine auxiliary and winch gearbox shafts
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox shafts
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
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
Selection pitfalls — read before you substitute
- Bearings of 65 mm bore arrive heavy enough that handling damage (dents from slings, tilting on the shaft) is a real failure precursor — use proper lifting and heating kit.
- The 7900 extra-light section is chosen for speed and stiffness, not for load margin — check that C0 18 kN really covers the worst static case before substituting it for a 7000.
- The C0 of 18 kN is a static rating, not a permissible running thrust — sizing continuous axial load from C0 alone is a recurring drawing-office error.
- Do not pair two random 7913 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.
- A 7913 mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- The 20.2/18 kN ratings and 1.2 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7913; 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 7913?
7913 is a single-row angular contact ball bearing to ISO 15: 65 mm bore, 90 mm outside diameter, 13 mm width (2.559 x 3.543 x 0.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 20.2 kN, C0 18 kN and a 1.2 kN fatigue load limit Pu; the grease limiting speed is 7,200 r/min and the oil rating 9,600 r/min; mass about 245 g.
How is the 7913 designation structured?
79 is the single-row dimension series (extra-light, high-speed 7900 single-row family); 13 encodes the 65 mm bore (bore code x 5); with no letter after the digits it is the standard 30 deg contact-angle execution — the 40 deg version carries a B. The 90 mm OD and 13 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7913 support?
One 7913 alone takes thrust in one direction only, along its 30 deg contact angle; reversing thrust calls for a second bearing or a factory-matched DB/DF/DT pair (the catalogue right-hand columns list the paired ratings). Radial load is always carried as a combined load through the angled contact.
What lubrication speeds does NTN print for 7913?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 7,200 r/min and the oil rating 9,600 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 7913?
The 65/90/13 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 20.2 kN / C0 18 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.