STO-8-TN 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-8-TN model number is decoded

the 24 mm outside diameter runs on the track while the 8 mm bore takes the pin or shaft; the 10 mm overall width spreads the Hertzian contact over the outer ring published ratings C 4.13 kN and C0 5.4 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.76 is typical for support roller without flange rings, with inner ring executions fatigue load limit Pu 0.6 kN at 8 mm bore gives a specific load of 0.52 kN per mm; the limiting speed is 7,000 r/min the 10 mm width carries the load at 0.41 kN per mm of roller complement; section height 8.0 mm between bore and track surface determines the outer-ring bending stiffness mass 26 g over a 24x10 mm envelope works out to 0.108 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-high-speed cam duty with a 8 mm bore this is one of the smallest sizes listed; the reduced section height limits the outer-ring bending stiffness, so track alignment must be held closely STO denotes the basic support roller: a needle roller and cage assembly running directly on the track, with an inner ring but no flange rings; axial guidance must come from the adjacent machine structure typical applications include conveyor transfer and diverting rollers, woodworking machinery feed rollers and cam mechanisms and indexing drives this size is commonly specified for conveyor transfer and diverting rollers and woodworking machinery feed rollers, where the 24 mm track diameter and 8 mm bore fit standard cam and rail geometries in cam mechanisms and indexing drives the 24 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 26 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

• mounting on a worn or undersized pin reduces the effective clearance and can preload the roller hot
• the open design has no integral sealing; in dusty environments contamination enters directly between the needle rollers and the raceway
• the narrow width concentrates the Hertzian contact stress; verify the track material hardness is sufficient for the calculated contact pressure