KR-30-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-30-PPA model number is decoded

the 30 mm outside diameter runs on the track while the 12 mm stud shank takes the pin or shaft; the 40 mm overall width spreads the Hertzian contact over the outer ring published ratings C 6.44 kN and C0 8 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.81 is typical for cam follower with needle roller and cage executions fatigue load limit Pu 0.88 kN at 12 mm stud gives a specific load of 0.54 kN per mm; the limiting speed is 4,800 r/min the 40 mm width carries the load at 0.16 kN per mm of roller complement; section height 9.0 mm between stud and track surface determines the outer-ring bending stiffness mass 88 g over a 30x40 mm envelope works out to 0.073 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty at 12 mm stud this size balances load capacity and envelope compactness — a frequent pick for packaging machines and printing press linkages the KR prefix identifies the standard stud-type cam follower — needle rollers with cage guidance between the 12 mm stud and the 30 mm thick-walled outer ring PPA denotes the crowned running surface: the 30 mm OD is ground to a large radius rather than straight, reducing edge loading on misaligned cam tracks typical applications include woodworking machinery feed rollers, cam mechanisms and indexing drives and material handling lift and lower tracks this size is commonly specified for woodworking machinery feed rollers and cam mechanisms and indexing drives, where the 30 mm track diameter and 12 mm stud fit standard cam and rail geometries in material handling lift and lower tracks the 30 mm outer ring provides the rolling contact while the threaded stud simplifies mounting; the 88 g mass is low enough for rapid indexing cycles the stud thread must be torqued to the catalogue value; under-torque lets the follower rotate and wear the bracket hole the single-row needle complement is the lightest cam follower option; do not overload it beyond the printed C rating

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the cage-guided needle rollers are not suited to heavy shock — impact loads can crack the cage and release rollers
• the stud thread must be torqued to the catalogue value; under-torque lets the follower rotate and wear the bracket hole
• the single-row needle complement is the lightest cam follower option; do not overload it beyond the printed C rating