H715345-311 bearing: complete specifications & equivalents
The H715345-311 is a ISO 355 radial bearing sized 71.438 x 136.525 x 46.038 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 71.438 mm |
| Outer diameter D | 136.525 mm |
| Width B | 46.038 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 273 kN |
| Basic static load rating C0 | 355 kN |
| Fatigue load limit Pu | 39 kN |
| Reference speed (thermal) | 3800 rpm |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3100 g |
| Manufacturer designation | SKF H 715345/311 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & H715300-series range
| Bore d | 2.813 in |
|---|---|
| Outer diameter D | 5.375 in |
| Width B | 1.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 32.5 mm |
| Smallest bore in H715300-series | 71.438 mm |
| Largest outer diameter in H715300-series | 136.525 mm |
| Width range across H715300-series | 46.038–46.038 mm |
| Bore position in H715300-series (smallest first) | 1 of 1 |
| Bore above smallest H715300-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| H715345-H715311 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 71.438×136.525×46.038 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| H715345-311 | Timken | full Dimensions and internal design equivalent — standard interchange. | Same inch-series cone/cup boundary envelope (d/D/T); load ratings and speed limits are brand-specific and may differ. |
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 H715345-311 model number is decoded
Digit by digit, H715345 reads as cone reference / cup reference in the H715300-series inch series; the 71.438 mm bore, 136.525 mm OD and 46.038 mm width are the metric equivalents of the original inch boundary values. In SKF suffix language a bare H715345 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 3,800 r/min thermal reference and 4,500 r/min mechanical limiting speed. For a 71.438 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two H715345 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Journal and housing interface: the 71.438 mm bore takes a k5 shaft seat (upper deviation ~0.143 mm for this diameter range) and the 136.525 mm outside diameter pairs with an H7 housing bore tolerance band of 136.525.000/136.545 mm; the 46.038 mm width defines the shoulder depth, and the 3100 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Two catalogue entries share the H 715345 cone but use different cups; this one, H715345, takes the 311 cup and is ground for the resulting 136.525 mm OD / 46.038 mm width envelope. Selecting a sibling cup produces a different boundary plan and a different order number, so the full designation is required at purchase.The SKF H 715345/311 is a 71.438×136.525×46.038 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.
Typical equipment & failure modes
Common applications
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
- rolling-mill auxiliary drives
- rolling-mill auxiliary drives
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- Mount the 71.438 mm bore H715345 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.
- The H715300-series inch series at 71.438 mm bore (136.525×46.038 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
- Do not mix brands or executions inside one H715345 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the H715345 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- The 3100 g mass and 46.038 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of H715345.
- The 273/355 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of H715345 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF H 715345/311 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the H715345 inch-series designation work?
Inch-series tapered roller bearings use a Timken-style cone/cup convention: the number before the slash identifies the cone (inner ring with roller and cage assembly), the number after the slash identifies the cup (outer ring), and the H715300-series code marks the dimensional series. The metric dimensions 71.438×136.525×46.038 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in H715345 mean?
The cone number (before the slash) identifies the inner ring, rollers and cage; the cup number (after the slash) identifies the outer ring. Both are quoted together because a single-row tapered roller bearing is a matched separable pair — the cone and cup are ground to work together and are not interchangeable with arbitrary other parts. The series prefix (H715300-series) groups sizes that share the same boundary-dimension plan.
Can a single H715345 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does H715345 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load H715345 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit H715345?
For a rotating shaft under normal load, seat the cone on a k5 shaft fit; the cup is usually a loose-to-transition fit in the housing so it can creep slightly and distribute wear. Chamfer and shoulder diameters must clear the bearing rings so the 46.038 mm-wide cup seats square; the mounting setting (end play or preload) is set by the axial position of the cup relative to the cone.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB on 2026-09-28. Read our editorial & correction policy.