HM518445-410 bearing: complete specifications & equivalents
The HM518445-410 is a ISO 355 radial bearing sized 88.9 x 152.4 x 39.688 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 88.9 mm |
| Outer diameter D | 152.4 mm |
| Width B | 39.688 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 300 kN |
| Basic static load rating C0 | 355 kN |
| Fatigue load limit Pu | 39 kN |
| Reference speed (thermal) | 3400 rpm |
| Limiting speed (mechanical) | 4000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2850 g |
| Manufacturer designation | SKF HM 518445/410 |
| 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 & HM518400-series range
| Bore d | 3.5 in |
|---|---|
| Outer diameter D | 6 in |
| Width B | 1.563 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 31.8 mm |
| Smallest bore in HM518400-series | 88.9 mm |
| Largest outer diameter in HM518400-series | 152.4 mm |
| Width range across HM518400-series | 39.688–39.688 mm |
| Bore position in HM518400-series (smallest first) | 1 of 1 |
| Bore above smallest HM518400-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM518445-410 | 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 HM518445-410 model number is decoded
Journal and housing interface: the 88.9 mm bore takes a k5 shaft seat (upper deviation ~0.178 mm for this diameter range) and the 152.4 mm outside diameter pairs with an H7 housing bore tolerance band of 152.4.000/152.420 mm; the 39.688 mm width defines the shoulder depth, and the 2850 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Cup-side note for 410: the outer ring's rib profile and the 152.4 mm outside diameter are cup-specific within the HM518400-series tables, so substituting a different cup against the same HM 518445 cone changes both the assembled 39.688 mm width and the axial free-play setting of the mounted pair.Ordering number SKF HM 518445/410 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 88.9 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.In SKF inch-series tables HM518445 sits at 88.9 mm bore (3.5 in) with a 152.4 mm cup OD and 39.688 mm total width — dimensions that trace back to the original Timken boundary plan for the HM518400-series family. In SKF suffix language a bare HM518445 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.18 (static 355 kN against dynamic 300 kN), typical of a tapered roller sized for axial capacity, and the 39 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single HM518445 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.
Typical equipment & failure modes
Common applications
- rolling-mill auxiliary drives
- crane sheave and hoist gearboxes
- paper-machine and printing rolls
- construction machinery 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
- false brinelling on idle paired sets exposed to machine vibration
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- Mount the 88.9 mm bore HM518445 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 HM518400-series inch series at 88.9 mm bore (152.4×39.688 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.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of HM518445 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of HM518445 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- The 2850 g mass and 39.688 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 HM518445.
- The 300/355 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 HM518445 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 518445/410 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What shaft and housing fits suit HM518445?
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 39.688 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.
Is HM518445 interchangeable with other brands?
Inch-series tapered roller bearings follow a long-standing industry boundary plan, so cones and cups of the same basic number are generally dimensionally interchangeable across manufacturers. However, internal geometry, cage design and load ratings differ by brand, so for paired or precision applications keep both halves of the set from one manufacturer — or re-verify ratings and setting when mixing.
What are the dimensions and catalogue data of HM518445?
The SKF HM 518445/410 is a single-row tapered roller bearing with 88.9 mm bore, 152.4 mm outer diameter and 39.688 mm width (3.5 × 6 × 1.563 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 300 kN, C0 355 kN, fatigue load limit Pu 39 kN, reference speed 3,400 r/min, limiting speed 4,000 r/min, mass about 2850 g. It is an open, separable bearing with a pressed-steel cage.
How does the HM518445 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 HM518400-series code marks the dimensional series. The metric dimensions 88.9×152.4×39.688 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in HM518445 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 (HM518400-series) groups sizes that share the same boundary-dimension plan.
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.