71913 bearing: complete specifications & equivalents
The 71913 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 | Generic ISO interchange (unbranded) |
| Bore diameter d | 65 mm |
| Outer diameter D | 90 mm |
| Width B | 13 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | brass |
| Operating temperature | -40 to +150 °C |
| Mass (geometry estimate) | 202 g |
| Standard | ISO 15 |
| Catalog version | iso15-ed4-geometry |
| Last verified | 2026-09-24 |
Source: ISO 15 boundary-dimensions standard · extracted 2026-09-24
Standard-interchange bearing: dimensions per ISO 15; CN clearance, P0 tolerance and a stamped-steel cage are catalogue defaults unless the supplier states otherwise, and mass is a geometry-derived estimate. Brand catalogue load ratings and limiting speeds for 71913 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 71900-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 71900-series | 20 mm |
| Largest outer diameter in 71900-series | 140 mm |
| Width range across 71900-series | 9–20 mm |
| Bore position in 71900-series (smallest first) | 10 of 17 |
| Bore above smallest 71900-series size | 45 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 71913 model number is decoded
In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61913 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.
Typical equipment & failure modes
Common applications
- packaging machinery
- robotics joint arms
- precision rotary tables
- medical and lab spindles
Known failure patterns
- fretting corrosion on a loose shaft seat that lets the inner ring creep
- false brinelling from vibration while the shaft is stationary
- edge loading and early spalling from shaft deflection or housing misalignment
- electric pitting in VFD-driven spindles without shaft grounding protection
Selection pitfalls — read before you substitute
- Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.
- The 719xx thin section (12.5 mm section height at 65 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.
- Draw-up on a thin-section 71913 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.
- Angular-contact 71913 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.
- Preload class matters: a 71913 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.
Frequently asked questions
What are the dimensions of a 71913 angular-contact bearing?
A 71913 single-row angular-contact ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 202 g for a brass-cage unit; catalogue masses vary with cage and ball complement.
How does the 71913 bore code work?
The last two digits of 71913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61913 deep-groove envelope.
What is the contact angle of 71913?
The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue.
Can a single 71913 take axial load in both directions?
No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load.
What fits suit a thin-section 71913?
On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load.
Reviewed & verified by the MPN Base engineering desk against source catalog iso15-ed4-geometry on 2026-09-24. Read our editorial & correction policy.