Bower3386Tapered Roller Bearing Cone, 1-9/16 in. Bore, 1.1965 in. Inner Ring Width, Imperial Inch Series

Product Description

What this part is

A single-row imperial tapered roller bearing cone in the ISO/ANSI 3386 size — the inner ring together with its tapered rollers and cage. It forms the shaft-side half of a two-piece TS single-row tapered bearing. Cone only. The matching cup is the Timken 3320, with the 3321 as the second published pairing.

Decoding the designation

3386 is an inch-series number under the ANSI/ABMA interchange scheme rather than a metric ISO designation, so the digits define the cone geometry independently of brand. Bower is a legacy United States bearing brand whose inch-series numbering follows the same scheme. Tapered roller bearings carry no internal-clearance suffix because clearance is established at assembly rather than built into the part.

What these specs mean in practice

The K factor of 2.14 is high for this size band, meaning a shallow cup angle: the 3386/3320 pairing is weighted toward radial capacity and carries a smaller proportion of thrust than a low-K bearing on the same envelope. The effective centre sits 0.43 in. inside the cone backface, which is the load-line reference for calculating effective bearing spread in an opposed two-row mounting.

Published ratings and mounting data

Bore (d): 1-9/16 in. (39.688 mm)
Inner ring width (B): 1.1965 in. (30.391 mm)
Dynamic radial rating C1, matched 3386/3320 assembly: 25,800 lbf (115,000 N)
Dynamic radial rating C90, matched 3386/3320 assembly: 6,700 lbf (29,800 N)
Dynamic thrust rating Ca90, matched assembly: 3,130 lbf (13,900 N)
Static radial rating C0, matched assembly: 29,100 lbf (129,000 N)
K factor: 2.14
Maximum shaft fillet radius: 0.03 in. (0.800 mm)
Shaft backing shoulder diameter: 1.79 in. frontface, 1.83 in. backface
Cone weight: 2.1 lb (0.9 kg)

Quantity and configuration

One cone assembly, sold individually. Single row, tapered rollers, steel cage.

Fitting notes

The cone takes an interference fit on the shaft and is driven from the backface onto the shoulder, with the load path through the inner ring rather than the cage. The tight 0.03 in. maximum shaft fillet radius means the shaft corner needs to be small or relieved for the backface to seat square. Endplay or preload is set after the cup is in its housing bore.

Interchange guidance

3386 interchanges directly across Timken, Bower, BCA, Koyo, NTN and SKF because the inch-series number defines the geometry. The 3382 and 3387 are related sizes in the same number block with different inner ring dimensions and are separate parts.