STO-17 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-17 model number is decoded

the 40 mm outside diameter runs on the track while the 17 mm bore takes the pin or shaft; the 16 mm overall width spreads the Hertzian contact over the outer ring published ratings C 14.2 kN and C0 17.6 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.81 is typical for support roller without flange rings, with inner ring executions fatigue load limit Pu 2.08 kN at 17 mm bore gives a specific load of 0.84 kN per mm; the limiting speed is 4,500 r/min the 16 mm width carries the load at 0.89 kN per mm of roller complement; section height 11.5 mm between bore and track surface determines the outer-ring bending stiffness mass 110 g over a 40x16 mm envelope works out to 0.172 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty at 17 mm bore this size balances load capacity and envelope compactness — a frequent pick for packaging machines and printing press linkages the STO prefix identifies the open, flangeless support roller design — it relies on the 17 mm pin and the housing shoulders for lateral guidance, and the printed 4500 r/min limiting speed reflects the unshielded roller complement typical applications include automotive welding jig positioners, conveyor transfer and diverting rollers and woodworking machinery feed rollers this size is commonly specified for automotive welding jig positioners and conveyor transfer and diverting rollers, where the 40 mm track diameter and 17 mm bore fit standard cam and rail geometries in woodworking machinery feed rollers the 40 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 110 g mass is low enough for rapid indexing cycles without integral flanges, axial float must be controlled by external washers or circlips — free axial movement causes edge loading on the outer ring the needle roller complement is sensitive to misalignment; a bent shaft or angled track creates uneven load distribution and early raceway pitting

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the open design has no integral sealing; in dusty environments contamination enters directly between the needle rollers and the raceway
• without integral flanges, axial float must be controlled by external washers or circlips — free axial movement causes edge loading on the outer ring
• mounting on a worn or undersized pin reduces the effective clearance and can preload the roller hot