STO-30 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 15 support rollers / ch. 16 cam followers) · extracted 2026-09-30

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 15 support rollers / ch. 16 cam followers); 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 STO-30 model number is decoded

the 62 mm outside diameter runs on the track while the 30 mm bore takes the pin or shaft; the 20 mm overall width spreads the Hertzian contact over the outer ring published ratings C 22.9 kN and C0 34.5 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.66 is typical for support roller without flange rings, with inner ring executions fatigue load limit Pu 4.25 kN at 30 mm bore gives a specific load of 0.76 kN per mm; the limiting speed is 2,600 r/min the 20 mm width carries the load at 1.15 kN per mm of roller complement; section height 16.0 mm between bore and track surface determines the outer-ring bending stiffness mass 310 g over a 62x20 mm envelope works out to 0.250 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 30 mm bore places this in the medium band, where cylindrical-roller full-complement designs become available for heavier radial loads the STO prefix identifies the open, flangeless support roller design — it relies on the 30 mm pin and the housing shoulders for lateral guidance, and the printed 2600 r/min limiting speed reflects the unshielded roller complement typical applications include robotic arm track guidance, paper mill web guide rollers and automatic assembly machine linkages this size is commonly specified for robotic arm track guidance and paper mill web guide rollers, where the 62 mm track diameter and 30 mm bore fit standard cam and rail geometries in automatic assembly machine linkages the 62 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 310 g mass is low enough for rapid indexing cycles the narrow width concentrates the Hertzian contact stress; verify the track material hardness is sufficient for the calculated contact pressure without integral flanges, axial float must be controlled by external washers or circlips — free axial movement causes edge loading on the outer ring

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• without flange rings the roller needs lateral guidance from the housing shoulders — running without side support lets the roller walk off the track
• the narrow width concentrates the Hertzian contact stress; verify the track material hardness is sufficient for the calculated contact pressure
• the open design has no integral sealing; in dusty environments contamination enters directly between the needle rollers and the raceway