32221-SKF bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric 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. 8.1 metric 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 32221-SKF model number is decoded

SKF 32221 belongs to the SKF single-row tapered roller range — the 105 mm bore entry in the 32200 series, dimensioned 190 mm OD and 53 mm wide to the ISO 355 boundary plan.Numbering ties the bearing to its envelope: 32221 means tapered-roller type 3, heavy section series 22, 105 mm bore — which is why the 190×53 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In SKF suffix language a bare 32221 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 42.5 mm radial section height ((190−105)/2) and 6000 g catalogue mass frame a 105 mm bore bearing rated at 443 kN C — roughly 4.22 kN of dynamic capacity per millimetre of bore before application factors. For a 105 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 32221 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Dimensional interchange map: within the 32200 series at 105 mm bore, the 190 mm OD and 53 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 42.5 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 6000 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 105 mm bore 32221 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 322 series at 105 mm bore (190×53 mm) is a wider, higher-capacity section than 30221; do not substitute without re-checking shaft shoulder diameters and pair setting.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the 32221 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• Setting is a design value, not an assembly feel: excessive preload in the 32221 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• Open 32221 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.
• The 443/510 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 32221 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32221 designation when purchasing and match the execution to the mounting arrangement.