PWKR-40-2RS 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 PWKR-40-2RS model number is decoded

the 40 mm outside diameter runs on the track while the 18 mm stud shank takes the pin or shaft; the 58 mm overall width spreads the Hertzian contact over the outer ring published ratings C 13.8 kN and C0 14.3 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.97 is typical for sealed full-complement cylindrical-roller cam follower executions fatigue load limit Pu 1.5 kN at 18 mm stud gives a specific load of 0.77 kN per mm; the limiting speed is 4,500 r/min the 58 mm width carries the load at 0.24 kN per mm of roller complement; section height 11.0 mm between stud and track surface determines the outer-ring bending stiffness mass 240 g over a 40x58 mm envelope works out to 0.103 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 18 mm stud diameter falls in the small-size band, the most common choice for general-purpose cam followers and light conveyor transfer rollers PWKR is the maintenance-free heavy cam follower: the twin-row full complement is sealed on both sides with NBR contact lips, eliminating relubrication and excluding contamination typical applications include robotic arm track guidance, paper mill web guide rollers and automatic assembly machine linkages this size is commonly specified for robotic arm track guidance and paper mill web guide rollers, where the 40 mm track diameter and 18 mm stud fit standard cam and rail geometries in automatic assembly machine linkages the 40 mm outer ring provides the rolling contact while the threaded stud simplifies mounting; the 240 g mass is low enough for rapid indexing cycles the 2RS seals limit relubrication; the grease fill must last the design life of the cam mechanism the sealed outer ring cannot be inspected without destroying the seals; plan replacement on a time or cycle basis rather than condition monitoring

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the sealed twin-row construction is the heaviest cam follower option — verify the drive torque can accelerate the roller at the required cam profile rate
• the 2RS seals limit relubrication; the grease fill must last the design life of the cam mechanism
• the sealed outer ring cannot be inspected without destroying the seals; plan replacement on a time or cycle basis rather than condition monitoring