47487-47420 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 47487-47420 model number is decoded

The SKF 47487/47420 is a 69.85×120×32.545 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.Digit by digit, 47487 reads as cone reference / cup reference in the 47400-series inch series; the 69.85 mm bore, 120 mm OD and 32.545 mm width are the metric equivalents of the original inch boundary values. 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 1.21 (static 228 kN against dynamic 188 kN), typical of a tapered roller sized for axial capacity, and the 26.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because the contact line is tapered, one 47487 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 69.85 mm shaft typically takes a k5 seat with an H7 housing bore. Journal and housing interface: the 69.85 mm bore takes a k5 shaft seat (upper deviation ~0.140 mm for this diameter range) and the 120 mm outside diameter pairs with an H7 housing bore tolerance band of 120.000/120.020 mm; the 32.545 mm width defines the shoulder depth, and the 1500 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Inch tapered bearings are matched sets, not mix-and-match components: 47487 pairs the 47487 cone with the 47420 cup under the 47400-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

• Mount the 69.85 mm bore 47487 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 47400-series inch series at 69.85 mm bore (120×32.545 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 47487 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 188 kN rating of 47487, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.
• Shaft and housing fillets must clear the bearing chamfer so the 32.545 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 188/228 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 47487 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 47487/47420 designation when purchasing and match the execution to the mounting arrangement.