Timken387A-90315Double-Row Tapered Roller Bearing Assembly – 2.2500 in Bore, 3.9370 in Outside Diameter, 1.9370 in Width, TDO Double Cup, Case-Carburized Steel

Product Description

What this part is:

Timken 387A-90315 double-row tapered roller bearing assembly, TDO (tapered double outer) configuration, Series 385, inch design. Built from two 387A cones and one 384ED double cup. Unit Quantity: 3 Pcs. Bore 2.2500 in (57.150 mm), outside diameter 3.9370 in (100.000 mm), width 1.9370 in (49.197 mm).

Decoding the designation:

387A — Timken inch tapered roller cone, 2.2500 in bore, inner ring width 0.8640 in (21.946 mm), K factor 1.65.

384ED — double cup: a single outer ring carrying two raceways, so both cone rows seat in one housing bore.

-90315 — Timken assembly number: the two cones and the double cup are supplied together as one matched unit.

Specifications:

Bore Diameter: 2.2500 in (57.150 mm). Outside Diameter: 3.9370 in (100.000 mm). Overall Width: 1.9370 in (49.197 mm). Rolling Elements: Tapered Roller. Number Of Rows: 2. Bore Type: Straight. Closure Type: Open. Bearing Material: Case-carburized steel. Series: 385. Arrangement: TDO (Tapered Double Outer). Mounting Arrangement: Back-to-back, two rows in one double cup. Unit Quantity: 3 Pcs.

Dimensions and mounting:

Cone inner ring width: 0.8640 in (21.946 mm). K Factor: 1.65. Geometry Factor (Cg): 0.0859. G1 Factor: 42. G2 Factor: 15.7. Per cone row, dynamic radial rating at 90 million revolutions (C90): 28,000 N; dynamic axial rating (Ca90): 16,900 N. Shaft backing shoulder diameter at the front face (da): 2.48 in (63 mm). At the back face (db): 2.76 in (70 mm). Maximum shaft fillet radius: 0.140 in (3.600 mm). Cage location from the cone back face (Aa): 0.03 in (0.8 mm); from the front face (Ab): 0.11 in (2.8 mm).

Compatibility and replacement:

Cross-references on the 387A/384ED numbers: SKF, FAG, NSK, NTN, Koyo, Nachi, Bower/BCA, Fersa. The 387A cone also runs against Timken single cups 382A and 382. Timken 388A/384ED uses a different cone with the same 384ED double cup.

Frequently asked questions:

What does the Timken 387A-90315 include?

Two 387A cones and one 384ED double cup. Unit Quantity: 3 Pcs.

What are the bore, outside diameter and width?

Bore 2.2500 in (57.150 mm), outside diameter 3.9370 in (100.000 mm), width 1.9370 in (49.197 mm).

What is a 384ED?

A double cup: one outer ring carrying two raceways, so both cone rows seat in one housing bore.