Timken3585Imperial Tapered Roller Bearing Cone, 1.6250 in / 41.275 mm Bore, Mates Cup 3520 – 1 Pc

Product Description

What this part is

This is an imperial single-row tapered roller bearing cone — the inner ring with its tapered rollers and cage. It is one half of a tapered roller bearing. The mating cup (outer race) is a separate part number and is not included in this listing.

Decoding the designation

3585 is a Timken imperial cone in the 35xx family. Its published mating cups are 3520, 3525, 3526, 3530 and the flanged 3525-B, so a complete single-row bearing is a 3585 cone plus whichever of those cups suits your housing. 3520 is the usual pairing.

Published dimensions

Cone bore (d): 1.6250 in / 41.275 mm
Inner ring width (B): 1.2160 in / 30.886 mm
Mating cup 3520 outside diameter (D): 3.3125 in / 84.138 mm
Mating cup 3520 width (C): 0.9375 in / 23.813 mm
Cone weight: 3.1 lb / 1.4 kg

Published ratings and mounting data

The ratings below are catalogue values for the complete 3585/3520 single-row assembly, not for the cone alone.

Dynamic radial rating C1 (1 million rev basis): 25,500 lbf / 113,000 N
Dynamic radial rating C90 (90 million rev basis): 6,610 lbf / 29,400 N
Dynamic axial rating Ca90: 3,460 lbf / 15,400 N
Static radial rating C0: 30,100 lbf / 134,000 N
K factor: 1.91 · e: 0.31 · Y: 1.96 · geometry factor Cg: 0.0808
Effective load centre: −0.40 in / −10.2 mm (inside the cone backface)
Maximum shaft fillet radius cleared: 0.06 in / 1.5 mm
Shaft backing shoulder diameter, frontface (da): 1.89 in / 48 mm
Shaft backing shoulder diameter, backface (db): 1.97 in / 50 mm
Cup 3520 housing backing shoulder: Da 3.15 in, Db 2.91 in; max housing fillet 0.130 in

What these specs mean in practice

This is a wide cone for its bore — 1.2160 in of inner ring on a 1.6250 in shaft — and the static rating of 30,100 lbf exceeding the dynamic C1 marks it as a shock-and-overload design rather than a high-speed one. The shallow 1.91 K factor keeps it radially biased and passes little induced thrust to the opposing bearing. The effective load centre sits 0.40 in inside the cone backface, which is a long way in: use it, not the physical face, when calculating bearing spread on a two-bearing shaft, or the span will come out short.

Quantity and configuration

This listing ships 1 Pc — one 3585 cone. No cup, no spacer, no seal.

Fitting notes

Press the cone on square with the driver bearing on the backface only, never on the rollers or cage. Keep the shaft shoulder within the da/db range and the shaft fillet under 0.06 in. A tapered roller bearing has no internal clearance until it is mounted, so the end play or preload is established after the cup is fully seated in its housing.

Interchange guidance

3585 is dimensionally standardised, so 3585 cones from Timken, Koyo, NTN, Bower/BCA and Federal-Mogul interchange with one another and with any maker’s 3520 cup. Be careful inside this family: 3576 and 3577 share the same 1.6250 in bore, the same inner ring width and identical published ratings, and run in the same 3520 cup, differing only in permissible shaft fillet radius, backface shoulder diameter and weight. They are close relatives rather than blind substitutes — check the fillet allowance against your shaft before swapping.