56425-56650 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 56425-56650 model number is decoded

A single-row inch tapered bearing is quoted as a cone/cup pair because the boundary dimensions belong to the combination, not to either half alone: in 56425 the 56425 cone contributes the 107.95 mm bore and roller set, the 56650 cup contributes the 165.1 mm OD raceway, and the assembled 36.512 mm width is the catalogue value.In SKF catalogue PUB BU/P1 17000, 56425 appears as SKF 56425/56650: an open, single-row tapered roller bearing in the 56000-series, supplied with a pressed-steel cage as standard.In SKF inch-series tables 56425 sits at 107.95 mm bore (4.25 in) with a 165.1 mm cup OD and 36.512 mm total width — dimensions that trace back to the original Timken boundary plan for the 56000-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. The 37.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.39 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Because the contact line is tapered, one 56425 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 107.95 mm shaft typically takes a m6 seat with an H7 housing bore. Dimensional interchange map: within the 56400 series at 107.95 mm bore, the 165.1 mm OD and 36.512 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 28.6 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 2700 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 107.95 mm bore 56425 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 56000-series inch series at 107.95 mm bore (165.1×36.512 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 56425 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 56425 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 165.1 mm cup race release as noise within the first running hours.
• The 256/355 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 56425 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 56425/56650 designation when purchasing and match the execution to the mounting arrangement.