LL639249-210 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 LL639249-210 model number is decoded

Ordering number SKF LL 639249/210 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 196.85 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.In SKF inch-series tables LL639249 sits at 196.85 mm bore (7.75 in) with a 241.3 mm cup OD and 23.812 mm total width — dimensions that trace back to the original Timken boundary plan for the LL639200-series family. 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. Selection arithmetic: the C0/C ratio is about 1.67 (static 315 kN against dynamic 189 kN), typical of a tapered roller sized for axial capacity, and the 29 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because the contact line is tapered, one LL639249 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 196.85 mm shaft typically takes a m6 seat with an H7 housing bore. Cross-section geometry: the 22.2 mm half-section ((241.3−196.85)/2) of this LL600-series unit places the roller large-end pitch diameter at roughly 219 mm, and the 23.812 mm axial width is split between cone (13 mm) and cup rib (11 mm) — a geometry that sets the contact angle and, with the 2100 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Inch tapered bearings are matched sets, not mix-and-match components: LL639249 pairs the LL 639249 cone with the 210 cup under the LL639200-series boundary plan, and although the same cone shows up against other cups in the catalogue, each pairing yields a distinct assembled width and a distinct rating row.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 196.85 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
• The LL639200-series inch series at 196.85 mm bore (241.3×23.812 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 LL639249 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.
• A single LL639249 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
• 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 189/315 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 LL639249 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LL 639249/210 designation when purchasing and match the execution to the mounting arrangement.