LM806649-610 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 LM806649-610 model number is decoded

Two catalogue entries share the LM 806649 cone but use different cups; this one, LM806649, takes the 610 cup and is ground for the resulting 88.9 mm OD / 19.05 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.SKF LM 806649/610 belongs to the SKF single-row tapered roller range — the 53.975 mm bore entry in the inch LM806600-series, dimensioned 88.9 mm OD and 19.05 mm wide.In SKF inch-series tables LM806649 sits at 53.975 mm bore (2.125 in) with a 88.9 mm cup OD and 19.05 mm total width — dimensions that trace back to the original Timken boundary plan for the LM806600-series family. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.09 (static 78 kN against dynamic 71.5 kN), typical of a tapered roller sized for axial capacity, and the 9 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of LM806649 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting. Load system: the 71.5 kN basic dynamic rating C and 78 kN static rating C0 give a C0/C balance of 1.09, and dividing C by the 53.975 mm bore yields 1.32 kN per millimetre of journal — a density metric that compares across families; the 9 kN fatigue limit Pu is the floor beneath which the adjusted-life calculation drops below acceptable L10 hours for a 53.975 mm shaft carrying variable duty.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 53.975 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 LM806649 pair heats, loses setting control and smears the roller-rib contact.
• The LM806600-series inch series at 53.975 mm bore (88.9×19.05 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.
• Setting is a design value, not an assembly feel: excessive preload in the LM806649 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• At the 71.5 kN rating of LM806649, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 7,000 r/min speed end and heavier preload only where moment stiffness dominates.
• The LM806649 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.
• The 71.5/78 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 LM806649 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 806649/610 designation when purchasing and match the execution to the mounting arrangement.