71914 bearing: complete specifications & equivalents
The 71914 is a ISO 15 radial bearing sized 70 x 100 x 16 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 | 100 mm |
| Width B | 16 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | brass |
| Operating temperature | -40 to +150 °C |
| Mass (geometry estimate) | 327 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 71914 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 71900-series range
| Bore d | 2.756 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 0.63 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 15 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) | 11 of 17 |
| Bore above smallest 71900-series size | 50 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 71914 model number is decoded
In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61914 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
- robotics joint arms
- precision rotary tables
- medical and lab spindles
- clutch and idler shafts
Known failure patterns
- 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
- raceway spalling from axial overload exceeding the single-direction thrust rating
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 719xx thin section (15.0 mm section height at 70 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.
- The 100 mm outer ring of 71914 is only 15.0 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 16 mm-wide raceway long before the load rating is reached.
- Preload class matters: a 71914 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.
- Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71914 backwards loads the low shoulder and displaces the balls out of the raceway.
Frequently asked questions
What are the dimensions of a 71914 angular-contact bearing?
A 71914 single-row angular-contact ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 327 g for a brass-cage unit; catalogue masses vary with cage and ball complement.
How does the 71914 bore code work?
The last two digits of 71914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61914 deep-groove envelope.
What is the contact angle of 71914?
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 71914 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 71914 run?
Thin-section angular-contact bearings reach high speeds because the 15.0 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.