KR-90-PPA 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 KR-90-PPA model number is decoded

the 90 mm outside diameter runs on the track while the 30 mm stud shank takes the pin or shaft; the 100 mm overall width spreads the Hertzian contact over the outer ring published ratings C 38 kN and C0 76.5 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.50 is typical for cam follower with needle roller and cage executions fatigue load limit Pu 9.5 kN at 30 mm stud gives a specific load of 1.27 kN per mm; the limiting speed is 1,800 r/min the 100 mm width carries the load at 0.38 kN per mm of roller complement; section height 30.0 mm between stud and track surface determines the outer-ring bending stiffness mass 2000 g over a 90x100 mm envelope works out to 0.222 g per mm² of projected area — a useful figure when sizing the drive inertia for low-speed cam duty the 30 mm stud diameter places this in the medium band, where cylindrical-roller full-complement designs become available for heavier radial loads KR names the basic cam follower: a stud-type track roller with a needle roller and cage assembly; the 30 mm stud shank mounts through a machine bracket and the 90 mm outer ring runs on the cam the PPA suffix specifies a crowned (radius) outer-ring running surface instead of the standard cylindrical profile — the crown distributes edge stress when the track is not perfectly aligned typical applications include paper mill web guide rollers, automatic assembly machine linkages and food processing line track rollers this size is commonly specified for paper mill web guide rollers and automatic assembly machine linkages, where the 90 mm track diameter and 30 mm stud fit standard cam and rail geometries in food processing line track rollers the 90 mm outer ring provides the rolling contact while the threaded stud simplifies mounting; the 2000 g mass is low enough for rapid indexing cycles the stud head is relatively small; use a washer under the nut to spread the clamping load and prevent bracket surface damage 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 single-row needle complement is the lightest cam follower option; do not overload it beyond the printed C rating
• the stud head is relatively small; use a washer under the nut to spread the clamping load and prevent bracket surface damage
• the open design has no integral sealing; in dusty environments contamination enters directly between the needle rollers and the raceway