HM88649X-610 bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 HM88649X-610 model number is decoded

Reading the designation: HM88649X follows the Timken-style inch convention — the cone (inner ring with rollers) and cup (outer ring) are quoted as a pair separated by a slash, and the HM88600-series code identifies the dimensional series. The 34.925 mm bore, 72.233 mm OD and 25.4 mm width are the metric equivalents of the inch boundary dimensions. In SKF suffix language a bare HM88649X 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 1.08 (static 90 kN against dynamic 83 kN), typical of a tapered roller sized for axial capacity, and the 10 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single HM88649X 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. Material and manufacturing detail: the 500 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the HM800 ISO envelope, with the pressed-steel cage contributing roughly 15 g of the total; the 34.925 mm bore is ground to IT5 roundness and the 72.233 mm OD to IT5 cylindricity, and the 25.4 mm width tolerance keeps the pair-setting scatter within the ISO preload class. Cup-side note for 610: the outer ring's rib profile and the 72.233 mm outside diameter are cup-specific within the HM88600-series tables, so substituting a different cup against the same HM 88649 X cone changes both the assembled 25.4 mm width and the axial free-play setting of the mounted pair.Ordering number SKF HM 88649 X/610 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 34.925 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 34.925 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight HM88649X pair heats, loses setting control and smears the roller-rib contact.
• The HM88600-series inch series at 34.925 mm bore (72.233×25.4 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 HM88649X 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 HM88649X pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
• The 83/90 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 HM88649X (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 88649 X/610 designation when purchasing and match the execution to the mounting arrangement.