KR-47-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-47-PPA model number is decoded

the 47 mm outside diameter runs on the track while the 20 mm stud shank takes the pin or shaft; the 66 mm overall width spreads the Hertzian contact over the outer ring published ratings C 14.7 kN and C0 24.5 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.60 is typical for cam follower with needle roller and cage executions fatigue load limit Pu 2.9 kN at 20 mm stud gives a specific load of 0.73 kN per mm; the limiting speed is 3,000 r/min the 66 mm width carries the load at 0.22 kN per mm of roller complement; section height 13.5 mm between stud and track surface determines the outer-ring bending stiffness mass 380 g over a 47x66 mm envelope works out to 0.123 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 20 mm stud shank puts this in the small-to-medium transition where the roller complement is still needle-type but the outer ring is thick enough for moderate shock loads the KR designation means the standard cam follower execution — cage-guided needle rollers for low friction, a threaded stud for direct bracket mounting, and a cylindrical outer ring for track contact the PPA variant has a crowned track surface: the 47 mm OD is finished with a large-radius crown that compensates for minor track misalignment and reduces edge stress concentration 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 47 mm track diameter and 20 mm stud fit standard cam and rail geometries in food processing line track rollers the 47 mm outer ring provides the rolling contact while the threaded stud simplifies mounting; the 380 g mass is low enough for rapid indexing cycles the stud shank must be fully supported by the bracket; a cantilevered stud bends under load and misaligns the roller the cage-guided needle rollers are not suited to heavy shock — impact loads can crack the cage and release rollers

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
• the stud shank must be fully supported by the bracket; a cantilevered stud bends under load and misaligns the roller
• the cage-guided needle rollers are not suited to heavy shock — impact loads can crack the cage and release rollers