Timken358/354ATapered Roller Bearing Cone & Cup Set – 1.7717 in Bore, 3.3465 in Cup Outer Diameter, 0.8125 in Assembled Width, Class 3, Case-Carburized Steel

Product Description

What this part is

Timken 358/354A single-row tapered roller bearing, supplied as a matched cone and cup set. The 358 is the cone, comprising the inner ring with its roller and cage assembly; the 354A is the cup, the outer race. Bore 1.7717 in (45.001 mm), cup outside diameter 3.3465 in (85.001 mm), assembled width 0.8125 in (20.638 mm).

Decoding the designation

Timken writes a single-row tapered roller assembly as cone number over cup number, so 358/354A names the two halves. The carton designations 358-3 and 354A-3 carry the –3 suffix, which is Timken precision Class 3. Cage is stamped steel and both rings are case-carburized steel.

What these specs mean in practice

The K factor of 1.91 is the ratio of radial to thrust capability, and the e factor of 0.31 is the load ratio above which the thrust term governs the equivalent load calculation. The Y factor is 1.96. Dynamic radial rating is 21,800 lbf on the ISO one-million-revolution basis and 5,650 lbf on the Timken ninety-million-revolution basis; dynamic axial rating is 2,960 lbf and static radial rating 20,000 lbf. Effective centre location is –0.19 in, inside the cone backface, which is the point through which the radial load acts when calculating bearing spacing.

Quantity and configuration

Two pieces, one cone and one cup, forming one complete single-row bearing. Assembled weight 1.1 lb.

Mounting dimensions

Shaft backing shoulder diameter is 1.97 in at the frontface and 2.09 in at the backface. Housing backing shoulder diameter is 3.18 in at the frontface and 3.03 in at the backface. Maximum shaft fillet radius that the bearing corners clear is 0.06 in, and maximum housing fillet radius 0.050 in. Cone inner ring width is 0.8540 in and cup outer ring width 0.6875 in. Cage location relative to the backface is 0 in and relative to the frontface 0.09 in.

Fitting notes

Tapered roller bearings mount in opposing pairs, and the setting is established at assembly by adjusting the axial position of one row against the other. The lubrication life adjustment geometry factor Cg is 0.0732, with G1 of 30 and G2 of 12.2.

Interchange guidance

The 358 cone runs against the 354A cup in this pairing. The 358A/354A, 359A/354A and 355/354A are related sizes sharing the 354A cup with a different cone, so the assembled width and factors differ.