KR30-PP bearing: complete specifications & equivalents

Specification table

Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30

Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.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 KR30-PP model number is decoded

envelope 12×30×40 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 6.8 kN and C0 8.7 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.24 kN at 12 mm stud, equivalent to 0.57 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.17 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 88 g, or 0.07 g per mm² of the 30×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 30 mm envelope must carry line-contact loads that no miniature ball bearing could take The caged pack keeps friction and inertia low — at 88 g this is the follower for fast indexing drives and high-cycle linkages The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 40 mm width. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 30 mm track diameter and 6.8 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 88 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 40 mm stud length and the published 8.7 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.
• Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.
• Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.