STO-25 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-25 model number is decoded

the 52 mm outside diameter runs on the track while the 25 mm bore takes the pin or shaft; the 16 mm overall width spreads the Hertzian contact over the outer ring published ratings C 16.5 kN and C0 22.8 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.72 is typical for support roller without flange rings, with inner ring executions fatigue load limit Pu 2.7 kN at 25 mm bore gives a specific load of 0.66 kN per mm; the limiting speed is 3,400 r/min the 16 mm width carries the load at 1.03 kN per mm of roller complement; section height 13.5 mm between bore and track surface determines the outer-ring bending stiffness mass 180 g over a 52x16 mm envelope works out to 0.216 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 25 mm bore falls in the small-size band, the most common choice for general-purpose cam followers and light conveyor transfer rollers the STO designation means the simplest yoke-type track roller — needle rollers between an inner ring and the thick-walled outer ring, with no added features beyond the basic load-carrying function typical applications include glass processing line conveyors, linear guide and track systems and robotic arm track guidance this size is commonly specified for glass processing line conveyors and linear guide and track systems, where the 52 mm track diameter and 25 mm bore fit standard cam and rail geometries in robotic arm track guidance the 52 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 180 g mass is low enough for rapid indexing cycles the open design has no integral sealing; in dusty environments contamination enters directly between the needle rollers and the raceway mounting on a worn or undersized pin reduces the effective clearance and can preload the roller hot

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 open design has no integral sealing; in dusty environments contamination enters directly between the needle rollers and the raceway
• mounting on a worn or undersized pin reduces the effective clearance and can preload the roller hot