32306 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 2026-09-26

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 32306 model number is decoded

For a 30 mm shaft carrying combined load, SKF lists 32306 under catalogue execution SKF 32306: one open single-row tapered roller bearing in the extra-heavy section of the 32300 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (extra-heavy section), and the last two digits encode the 30 mm bore; the 72 mm OD and 28.75 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.89 (static 85 kN against dynamic 95 kN), typical of a tapered roller sized for axial capacity, and the 9.65 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32306 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 30 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 32306 pair heats, loses setting control and smears the roller-rib contact.
• The 323 series at 30 mm bore (72×28.75 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30206, so recalculate dn and lubricant film before substitution.
• 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 32306 mounting error.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the 32306 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• The 32306 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.
• The 95/85 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 32306 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32306 designation when purchasing and match the execution to the mounting arrangement.