L44643-610 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 L44643-610 model number is decoded

Fit selection follows the rotating ring — interference on a rotating cone — and two L44643 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Cross-section geometry: the 12.4 mm half-section ((50.292−25.4)/2) of this L4400-series unit places the roller large-end pitch diameter at roughly 37 mm, and the 14.224 mm axial width is split between cone (8 mm) and cup rib (6 mm) — a geometry that sets the contact angle and, with the 130 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Within the L44600-series tables, L 44643 appears in several rows because SKF lists multiple cup options for the same cone. L44643 is the 610 variant, with 50.292 mm OD and 14.224 mm width; neighbouring rows on the same cone differ only in the cup but are separate orderable bearings.Ordering number SKF L 44643/610 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 25.4 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its inch-series envelope: L44643 means a cone and cup matched pair in the L44600-series series — which is why the 25.4×50.292×14.224 mm outline swaps dimensionally with other inch-series bearings of the same code. 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 3 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.94 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 25.4 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 L44643 pair heats, loses setting control and smears the roller-rib contact.
• The L44600-series inch series at 25.4 mm bore (50.292×14.224 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 L44643 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the L44643 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• Shaft and housing fillets must clear the bearing chamfer so the 14.224 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 32/30 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 L44643 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF L 44643/610 designation when purchasing and match the execution to the mounting arrangement.