Timken395A-90048Double-Row Tapered Roller Bearing Assembly – 2.6250 in Bore, 4.3307 in Outside Diameter, 2.0624 in Width, TDO Double Cup, Case-Carburized Steel

Product Description

What this part is:

Timken 395A-90048 double-row tapered roller bearing assembly, TDO (tapered double outer) configuration, Series 395, inch design. Bore Diameter: 2.6250 in (66.675 mm). Outside Diameter: 4.3307 in (110 mm). Overall Width: 2.0624 in (52.385 mm). The assembly is built from two 395A cones, one 394D double cup and one X1S-395-S cone spacer.

Decoding the designation:

395A — Timken inch tapered roller cone, Series 395, 2.6250 in bore, K factor 1.45.

394D — double cup: one outer ring carrying two raceways, seating both cone rows in a single housing bore.

X1S-395-S — cone spacer, ground to size to set the running clearance between the two rows.

-90048 — Timken assembly number: the cones, double cup and spacer are supplied together as one matched, bench-set unit.

What these specs mean in practice:

Dynamic Load Rating: 172,000 N (38,700 lbf). Static Load Rating: 125,000 N (28,100 lbf). Rolling Elements: Tapered Roller. Number Of Rows: 2. Bore Type: Straight. Closure Type: Open. Bearing Material: Case-carburized steel. Lubricant: grease or oil. Series: 395.

The two rows sit back to back inside the double cup. That gives a wide effective bearing spread, so the assembly carries radial load, thrust in both directions and overturning moment from a single housing bore.

K Factor: 1.45. e Factor: 0.40. Y1 Factor: 1.68. Y2 Factor: 2.50. Geometry Factor (Cg): 0.0984. Two-row dynamic radial rating at 90 million revolutions (C90-2): 44,600 N. Dynamic axial rating at 90 million revolutions (Ca90): 17,600 N.

Mounting data:

Outer Ring Width: 1.8125 in (46.038 mm). Shaft backing shoulder diameter at the backface (db): 2.87 in (73 mm). Housing backing shoulder diameter at the frontface (Da): 4.12 in (104.65 mm). Maximum shaft fillet radius cleared by the bearing corner: 0.030 in (0.8 mm). Maximum housing fillet radius cleared by the bearing corner: 0.03 in (0.8 mm).

Quantity and configuration:

Unit Quantity: 4 Pcs — two 395A cones, one 394D double cup and one X1S-395-S cone spacer, together forming the complete 395A-90048 assembly.

Interchange guidance:

395A and 394D are industry-standard inch tapered roller designations and are carried under the same numbers by SKF, FAG, NSK, NTN, Koyo, Nachi, Bower/BCA, Fersa and PEER. Base Number: 395A-90048. Searchable variants of the designation include 395A/394D, 395A 394D, 395-A, 394-D and X1S-395-S.