30310 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 30310 model number is decoded

SKF 30310 (SKF 30310) is the heavy-OD section tapered roller choice for a 50 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 110×29.25 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 03 is the ISO 355 diameter/width series (heavy-OD section), and the last two digits encode the 50 mm bore; the 110 mm OD and 29.25 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Catalogue mass 1250 g for the 50×110×29.25 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 50 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 30310 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 50 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 30310 pair heats, loses setting control and smears the roller-rib contact.
• The 303 series at 50 mm bore (110×29.25 mm) carries a larger OD and higher capacity than 30210 at the same bore; the bigger section runs hotter, so re-check the 6,300 r/min speed ceiling and shoulder diameters before substituting.
• Setting is a design value, not an assembly feel: excessive preload in the 30310 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• A single 30310 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
• The 30310 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 154/140 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 30310 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30310 designation when purchasing and match the execution to the mounting arrangement.