Timken52387-3Tapered Roller Bearing Cone – 3.8750 in Bore, 1.4219 in Cone Width, Class 3 Precision, Pressed Steel Cage, Mates With 52618 Cup

Product Description

What this part is

Timken 52387 *3 inch tapered roller bearing cone. Cone only. Manufacturer: Timken. Manufacturer Part Number: 52387-3. Cone Part Number: 52387. Base Number: 52387. Series: 52000. Bearing Type: Tapered Roller Bearing Cone. Number of Rows: 1. Rolling Elements: Tapered Rollers. Design Units: Inch. Bore: 3.8750 in (98.425 mm). Inner Ring Width: 1.4219 in (36.116 mm). Bore Type: Straight. Cage Type: Pressed steel. Cage Material: Steel. Bearing Material: Case-Carburized Steel. Precision Class: Class 3. Item Weight: 16.11 lb (7.306 kg). Unit Quantity: 1 Pc. The matching cup is the Timken 52618.

Decoding the designation

52387 is the cone number in Timken’s 52000 inch series. The trailing 3, written -3, *3 or #3, is Precision Class 3. Class 3 holds a tighter running-accuracy tolerance than standard, which gives lower running vibration and closer shaft location. Searchable forms of the number are 52387-3, 52387 *3, 52387 #3, 52387*3 and 52387.

What these specs mean in practice

Dynamic Radial Load Rating C1, per row, ISO method at 1 million revolutions: 50,200 lbf (223,000 N). Dynamic Radial Load Rating C90, per row, Timken method at 90 million revolutions: 13,000 lbf (57,900 N). Dynamic Axial Rating Ca90, per row: 10,600 lbf (47,100 N). Static Radial Load Rating C0: 77,000 lbf (343,000 N). K Factor: 1.23. G1 Factor: 175.4. G2 Factor: 41.7. Geometry Factor Cg: 0.152. Every rating above is a single-row value for this cone. A tapered roller bearing carries combined radial and thrust load through one row of rollers running on matched cone and cup raceways, and the K factor of 1.23 sets the ratio of radial to thrust capacity: a lower K means a steeper raceway angle and a larger share of thrust capacity. C1 and C90 are two different life bases for the same bearing, so they are not interchangeable in a calculation. Harmonization Code: 8482.20.00.

Mounting dimensions

Effective Center Location: −0.02 in (−0.5 mm), which places the effective centre inside the cone backface. Maximum Shaft Fillet Radius: 0.140 in (3.600 mm). Shaft Backing Shoulder Diameter, frontface (da): 4.25 in (108 mm). Shaft Backing Shoulder Diameter, backface (db): 4.49 in (114 mm). Cage Location relative to the backface (Aa): 0.16 in. Cage Location relative to the frontface (Ab): 0.12 in. These figures decide whether a given shaft step and fillet will clear the bearing corners and the cage.

Quantity and configuration

Unit Quantity: 1 Pc. Cone only: the inner ring with its tapered roller set and pressed steel cage, as one non-separable assembly.

Cone and cup mating

The matching cup is the Timken 52618, which makes the TS single-row assembly 52387/52618. The 52618P is the same cup in an alternative execution. Timken also lists this cone against the 52637, 52638 and 52639 cups, and against the flanged TSF cup 52637-B for assembly 52387-52637-B. A B suffix on a cup marks a flanged cup, which locates axially in a through-bored housing.

Interchange guidance

A standard-tolerance 52387 shares the same bore, width and raceway geometry, so it is dimensionally interchangeable, but it holds a wider running-accuracy tolerance than this Class 3 cone. The 52400 cone in the same series sits on a larger bore and is a related size rather than an interchange.