STO-35 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-35 model number is decoded

the 72 mm outside diameter runs on the track while the 35 mm bore takes the pin or shaft; the 20 mm overall width spreads the Hertzian contact over the outer ring published ratings C 24.6 kN and C0 39 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.63 is typical for support roller without flange rings, with inner ring executions fatigue load limit Pu 4.8 kN at 35 mm bore gives a specific load of 0.70 kN per mm; the limiting speed is 2,200 r/min the 20 mm width carries the load at 1.23 kN per mm of roller complement; section height 18.5 mm between bore and track surface determines the outer-ring bending stiffness mass 440 g over a 72x20 mm envelope works out to 0.306 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty at 35 mm bore this size crosses into the range where double-row full-complement executions (NUTR/PWTR/NUKR) offer substantially higher C ratings than the single-row needle designs the STO prefix identifies the open, flangeless support roller design — it relies on the 35 mm pin and the housing shoulders for lateral guidance, and the printed 2200 r/min limiting speed reflects the unshielded roller complement typical applications include material handling lift and lower tracks, sheet-metal forming press feeds and textile machine cam drives this size is commonly specified for material handling lift and lower tracks and sheet-metal forming press feeds, where the 72 mm track diameter and 35 mm bore fit standard cam and rail geometries in textile machine cam drives the 72 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 440 g mass is low enough for rapid indexing cycles 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

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 flange rings the roller needs lateral guidance from the housing shoulders — running without side support lets the roller walk off the track
• mounting on a worn or undersized pin reduces the effective clearance and can preload the roller hot