32009-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 32009-SKF model number is decoded

The SKF 32009 X is a 45×75×20 mm single-row tapered roller bearing — the low-friction section entry in the 32000 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the SKF nameplate, 32009 follows the ISO 355 convention: 3 for the tapered-roller type, 20 for the low-friction section, final digits 09 for the 45 mm bore. In SKF suffix language a bare 32009 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 340 g for the 45×75×20 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. A single 32009 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel. Journal and housing interface: the 45 mm bore takes a k5 shaft seat (upper deviation ~0.090 mm for this diameter range) and the 75 mm outside diameter pairs with an H7 housing bore tolerance band of 75.000/75.020 mm; the 20 mm width defines the shoulder depth, and the 340 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 45 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 32009 pair heats, loses setting control and smears the roller-rib contact.
• The 320 series at 45 mm bore (75×20 mm) is the low-friction, higher-speed section; it carries less thrust than a 30209 of the same bore, so verify the axial load share before swapping.
• At the 71.7 kN rating of 32009, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,500 r/min speed end and heavier preload only where moment stiffness dominates.
• Do not mix brands or executions inside one 32009 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
• The 340 g mass and 20 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32009.
• The 71.7/80 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 32009 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32009 X designation when purchasing and match the execution to the mounting arrangement.