32911 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 32911 model number is decoded

In SKF catalogue PUB BU/P1 17000, 32911 appears as SKF 32911: an open, single-row tapered roller bearing in the very-light thin section of the 32900 dimension series, supplied with a pressed-steel cage as standard.The code breaks down as type prefix 3 (tapered roller), series 29 (the very-light thin section), and bore code 11 = 55 mm; dimensions 55×80×17 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2BC); it is the dimensional series, not a separate part number. The 12.5 mm radial section height ((80−55)/2) and 280 g catalogue mass frame a 55 mm bore bearing rated at 51.7 kN C — roughly 0.94 kN of dynamic capacity per millimetre of bore before application factors. Mounting practice for 32911: the rotating cone takes the interference fit (k5 on a 55 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing. Load system: the 51.7 kN basic dynamic rating C and 69.5 kN static rating C0 give a C0/C balance of 1.34, and dividing C by the 55 mm bore yields 0.94 kN per millimetre of journal — a density metric that compares across families; the 7.2 kN fatigue limit Pu is the floor beneath which the adjusted-life calculation drops below acceptable L10 hours for a 55 mm shaft carrying variable duty.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 55 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 32911 pair heats, loses setting control and smears the roller-rib contact.
• The 329 series at 55 mm bore (80×17 mm) is the very-light thin-section envelope: the smallest OD of any tapered family at this bore, ideal where radial space is severely limited, but capacity is well below a 30211 of the same bore — confirm the L10 life and minimum axial load before choosing it.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the 32911 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 32911 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
• The 51.7/69.5 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 32911 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32911 designation when purchasing and match the execution to the mounting arrangement.