32021-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 32021-SKF model number is decoded

Ordering number SKF 32021 X in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 105 mm shaft, low-friction section, with an open pressed-steel-cage execution and one-direction axial capacity.The code breaks down as type prefix 3 (tapered roller), series 20 (the low-friction section), and bore code 21 = 105 mm; dimensions 105×160×35 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 32021 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 2450 g for the 105×160×35 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 105 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 32021 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Load system: the 248 kN basic dynamic rating C and 335 kN static rating C0 give a C0/C balance of 1.35, and dividing C by the 105 mm bore yields 2.36 kN per millimetre of journal — a density metric that compares across families; the 37.5 kN fatigue limit Pu is the floor beneath which the adjusted-life calculation drops below acceptable L10 hours for a 105 mm shaft carrying variable duty.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 105 mm bore 32021 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 320 series at 105 mm bore (160×35 mm) is the low-friction, higher-speed section; it carries less thrust than a 30221 of the same bore, so verify the axial load share before swapping.
• O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32021 mounting error.
• O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32021 mounting error.
• Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 248/335 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 32021 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32021 X designation when purchasing and match the execution to the mounting arrangement.