NSK48286/48220BASA3U17Inch Tapered Roller Bearing Cone & Flanged Cup Set – 4.8750 in Bore, 7.1875 in Cup OD, 1.3125 in Cup Width, K Factor 1.91.

Product Description

What this part is

NSK 48286 cone with 48220-B flanged cup, an inch-series tapered roller bearing set. Bore: 4.8750 in (123.825 mm). Cup Outside Diameter: 7.1875 in (182.563 mm). Cup Outer Ring Width: 1.3125 in (33.338 mm). Single row. Country of Origin: Japan.

Decoding the designation

48286 is the cone number and 48220-B the cup number. The B on the cup denotes a flanged cup: the outer ring carries an integral flange at one end. Flange Outside Diameter: 7.4335 in (188.811 mm). Flange Width: 0.25 in (6.35 mm). The full carton marking is 48286/48220BASA3U17; searchable forms include 48286/48220B, 48286-48220B, 48286 48220 B and 48220-B.

What these specs mean in practice

e Factor: 0.31. K Factor: 1.91. Y Factor: 1.97. A K near 2 marks a shallow contact angle, which favours radial capacity over thrust and suits positions where the axial component is modest. The flange on the cup locates the outer ring axially against a through-bored housing face, so no housing shoulder or retaining ring is needed on that side, and it sets the seal position accurately. Geometry Factor (Cg): 0.114, used in the lubrication life adjustment factor a3l.

Mounting dimensions

Maximum housing fillet radius: 0.130 in (3.30 mm). Housing backing shoulder diameter, frontface (Da): 7.01 in (177.04 mm). Cup weight: 8.000 lb (3.6 kg).

Quantity and configuration

Two pieces ship as one bearing: the 48286 cone, comprising the inner ring, rollers and cage, and the 48220-B flanged cup. Unit Quantity: 1 Set, 2 Pcs.

Interchange guidance

48286 to 48220-B is an established cone-and-cup pairing, and the same cone also pairs with the plain unflanged 48220 cup. The 48286 and 48220-B numbers are common inch designations carried by NSK, Timken and other makers, so the set cross-references on those numbers directly.