KRE-40-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 KRE-40-PPA model number is decoded

the 40 mm outside diameter runs on the track while the 22 mm stud shank takes the pin or shaft; the 58 mm overall width spreads the Hertzian contact over the outer ring published ratings C 10.5 kN and C0 14.6 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.72 is typical for cam follower with eccentric collar executions fatigue load limit Pu 1.73 kN at 22 mm stud gives a specific load of 0.48 kN per mm; the limiting speed is 3,400 r/min the 58 mm width carries the load at 0.18 kN per mm of roller complement; section height 9.0 mm between stud and track surface determines the outer-ring bending stiffness mass 260 g over a 40x58 mm envelope works out to 0.112 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 22 mm stud diameter falls in the small-size band, the most common choice for general-purpose cam followers and light conveyor transfer rollers KRE is the eccentric-collar cam follower: the collar is shrunk onto the stud and turned to adjust the roller centre, giving a preload or alignment correction without machining the bracket 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 linear guide and track systems, robotic arm track guidance and paper mill web guide rollers this size is commonly specified for linear guide and track systems and robotic arm track guidance, where the 40 mm track diameter and 22 mm stud fit standard cam and rail geometries in paper mill web guide rollers the 40 mm outer ring provides the rolling contact while the threaded stud simplifies mounting; the 260 g mass is low enough for rapid indexing cycles the eccentric collar is a friction fit on the stud — do not hammer it; use the correct spanner to rotate it to the preload setting after adjusting the eccentric collar, re-torque the stud nut; the collar setting changes the stud engagement length

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the eccentric collar is a friction fit — excessive adjustment force can score the stud surface and create a stress concentration
• the eccentric collar is a friction fit on the stud — do not hammer it; use the correct spanner to rotate it to the preload setting
• do not use the eccentric collar to compensate for gross track misalignment; the adjustment range is typically only 0.5–1.0 mm