71814 bearing: complete specifications & equivalents
The 71814 is a ISO 15 radial bearing sized 70 x 90 x 10 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 | 70 mm |
| Outer diameter D | 90 mm |
| Width B | 10 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | brass |
| Operating temperature | -40 to +150 °C |
| Mass (geometry estimate) | 128 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 71814 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 71800-series range
| Bore d | 2.756 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.394 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 10 mm |
| Smallest bore in 71800-series | 20 mm |
| Largest outer diameter in 71800-series | 125 mm |
| Width range across 71800-series | 7–13 mm |
| Bore position in 71800-series (smallest first) | 11 of 17 |
| Bore above smallest 71800-series size | 50 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 71814 model number is decoded
In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61814 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 70 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
- semiconductor handling axes
- packaging machinery
- robotics joint arms
- precision rotary tables
Known failure patterns
- raceway smearing under marginal lubrication at start-up before oil climb reaches the contact
- cage fracture from operation beyond the limiting speed with inadequate lubricant
- fretting corrosion on a loose shaft seat that lets the inner ring creep
- false brinelling from vibration while the shaft is stationary
Selection pitfalls — read before you substitute
- Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.
- The 718xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7214.
- The 90 mm outer ring of 71814 is only 10.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 10 mm-wide raceway long before the load rating is reached.
- Angular-contact 71814 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 71814 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 71814 angular-contact bearing?
A 71814 single-row angular-contact ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 128 g for a brass-cage unit; catalogue masses vary with cage and ball complement.
How does the 71814 bore code work?
The last two digits of 71814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61814 deep-groove envelope.
What is the contact angle of 71814?
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 71814 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.
How fast can a 71814 run?
Thin-section angular-contact bearings reach high speeds because the 10.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue.
Reviewed & verified by the MPN Base engineering desk against source catalog iso15-ed4-geometry on 2026-09-24. Read our editorial & correction policy.