INAKR47PPXStud Type Track Roller – 47 mm Outer Ring, 24 mm Running Width, M20x1.5 Stud, Sealed Both Sides

Product Description

What this part is

INA KR47-PP stud type track roller, sometimes called a cam follower. A solid steel stud with a threaded shank carries a thick-walled outer ring running on a needle roller and cage assembly, so the roller bolts straight into a plate or bracket and runs on a cam track. Outside Diameter: 47 mm. Overall Width: 66 mm over the stud. Outer ring width: 24 mm. Stud fit diameter: 20 mm. Thread: M20x1.5. Dynamic Load Rating: 15,400 N. Static Load Rating: 26,000 N. Limiting Speed: 2,400 rpm on permanent grease lubrication. Rolling Elements: Needle Roller. Number Of Rows: 1. Closure Type: Plastic axial plain washers, sealed both sides. Lubricant: Grease. Item Weight: 0.371 kg (0.82 lb). Series: KR. Base Number: KR47.

Decoding the designation

KR — stud type track roller with a solid roller stud and a fixing thread.

47 — outside diameter of the running outer ring in millimetres. On a stud roller the leading number is the outer diameter, not a bore.

PP — three-stage sealing by plastic axial plain washers on both sides. The washers also provide the axial guidance of the outer ring.

What these specs mean in practice

The particularly thick-walled outer ring is what separates a track roller from an ordinary needle bearing: it takes the line contact and edge loading of a cam track directly, without a housing to spread the load. Static Load Rating: 26,000 N is the figure that matters on an indexing or intermittent motion, where shock rather than fatigue sets the limit. Dynamic Load Rating: 15,400 N. Fatigue load limit: 3,450 N.

Speed on permanent grease lubrication: 2,400 rpm.

Mounting data

Thread: M20x1.5, 21 mm long. Effective stud length: 40.5 mm. Stud fit diameter: 20 mm. Width of flats: 10 mm, for a spanner on the stud end during tightening. Tightening torque for the nut: 120 Nm (88.5 ft-lb).

Relubrication: the stud carries a 4 mm lubrication hole, 9 mm from the datum face, taking a drive-fit NIPA2X7,5 nipple. Grease fed there reaches the needle roller set through the stud.

Maximum width of the thrust washer: 25.6 mm. Stop diameter of the thrust washer: 36.5 mm. Protrusion of the outer ring past the thrust washer: 0.8 mm. Minimum chamfer dimension: 1 mm.

Quantity and configuration

Unit Quantity: 1 Pc. Complete track roller: stud, needle roller and cage assembly, outer ring and both sealing washers.

Interchange guidance

The KR stud type track roller range is dimensioned to Schaeffler’s own scheme rather than to an ISO series number, so the nine-way interchange that applies to ISO-numbered radial bearings does not carry across and none is claimed here. The M20x1.5 thread, 20 mm stud fit and 47 mm outer ring are the dimensions that decide a substitution. Designation variants: KR 47 PP, KR47PP, KR-47-PP, KR47PP-X, KR47-PP-X, KR47PPX.