HM218248-210 bearing: complete specifications & equivalents
The HM218248-210 is a ISO 355 radial bearing sized 90 x 147 x 40 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 90 mm |
| Outer diameter D | 147 mm |
| Width B | 40 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 280 kN |
| Basic static load rating C0 | 355 kN |
| Fatigue load limit Pu | 39 kN |
| Reference speed (thermal) | 3400 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2550 g |
| Manufacturer designation | SKF HM 218248/210 |
| 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 & HM218200-series range
| Bore d | 3.543 in |
|---|---|
| Outer diameter D | 5.787 in |
| Width B | 1.575 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 28.5 mm |
| Smallest bore in HM218200-series | 90 mm |
| Largest outer diameter in HM218200-series | 147 mm |
| Width range across HM218200-series | 40–40 mm |
| Bore position in HM218200-series (smallest first) | 1 of 1 |
| Bore above smallest HM218200-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM218248-HM218210 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 90×147×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| HM218248-210 | 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 HM218248-210 model number is decoded
For a 90 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two HM218248 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Speed envelope and thermal behaviour: at 3,400 r/min thermal reference, the 90 mm bore shaft runs at a dn of 306k, and the 28.5 mm section dissipates heat through the cup-to-housing contact path; the 4,300 r/min mechanical ceiling reflects cage strength, and the 2550 g spinning cone contributes gyroscopic moment under rapid speed reversal. The cup reference 210 is structural, not a suffix: it identifies the outer ring that, combined with the HM 218248 cone, produces the 90/147/40 mm envelope catalogue-listed as HM218248. Quote the cup number in full when ordering — the HM218200-series tables contain other cups that fit the same cone but change the bearing.Ordering number SKF HM 218248/210 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 90 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.The HM218200-series series assigns 90 mm bore, 147 mm OD and 40 mm width to HM218248; the cone and cup references are not interchangeable with other inch-series pairs even when the bore matches, because the cup profile and rib geometry are series-specific. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. The 39 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.27 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running.
Typical equipment & failure modes
Common applications
- large process pump and compressor shafts
- rolling-mill auxiliary drives
- crane sheave and hoist gearboxes
- 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
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- false brinelling on idle paired sets exposed to machine vibration
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- Mount the 90 mm bore HM218248 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 HM218200-series inch series at 90 mm bore (147×40 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 HM218248 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.
- O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common HM218248 mounting error.
- Catalogue reference speed and limiting speed are different limits: the 3,400 r/min reference is a thermal criterion under load, while the 4,300 r/min limiting value is the mechanical ceiling — observe both.
- The 280/355 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 HM218248 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 218248/210 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does HM218248 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 HM218248 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit HM218248?
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 40 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 HM218248 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 HM218248?
The SKF HM 218248/210 is a single-row tapered roller bearing with 90 mm bore, 147 mm outer diameter and 40 mm width (3.543 × 5.787 × 1.575 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 280 kN, C0 355 kN, fatigue load limit Pu 39 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 2550 g. It is an open, separable bearing with a pressed-steel cage.
How does the HM218248 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 HM218200-series code marks the dimensional series. The metric dimensions 90×147×40 mm are the converted equivalents of the original inch boundary dimensions.
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.