Timken3576/3525Tapered Roller Bearing Cone & Cup Set – 1-5/8 in Bore, 3.4375 in Cup Outer Diameter, 1.1875 in Assembled Width, Case-Carburized Steel

Product Description

What this part is

Timken 3576/3525 single-row tapered roller bearing, supplied as a matched cone and cup set. The 3576 is the cone, comprising the inner ring with its roller and cage assembly; the 3525 is the cup, the outer race. Bore 1-5/8 in (41.275 mm), cup outside diameter 3.4375 in (87.313 mm), assembled width 1.1875 in (30.163 mm).

Decoding the designation

Timken writes a single-row tapered roller assembly as cone number over cup number, so 3576/3525 names the two halves. Cage is stamped steel and both rings are case-carburized steel, hard at the raceway surface and tough through the core.

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 25,500 lbf on the ISO one-million-revolution basis and 6,610 lbf on the Timken ninety-million-revolution basis; dynamic axial rating is 3,460 lbf and static radial rating 30,100 lbf. Effective centre location is –0.4 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 1.8 lb.

Mounting dimensions

Shaft backing shoulder diameter is 1.89 in at the frontface and 1.93 in at the backface. Housing backing shoulder diameter is 3.23 in at the frontface and 2.95 in at the backface. Maximum shaft fillet radius that the bearing corners clear is 0.03 in, and maximum housing fillet radius 0.130 in. Cone inner ring width is 1.2160 in and cup outer ring width 0.9375 in. Cage location relative to the backface is 0.07 in and relative to the frontface 0.05 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 0.0808, with G1 of 39.5 and G2 of 10.5.

Interchange guidance

The 3576 cone runs against the 3525 cup in this pairing. The 3577/3525 and 3578/3525 are related sizes sharing the 3525 cup with a different cone, so the bore, assembled width and factors differ.