Timken47820-3Single Cup – 5.7500 in Outside Diameter, 1.0313 in Width, Class 3 Precision

Product Description

What this part is

Timken 47820-3 single cup for inch-series tapered roller bearings, the outer ring of a cone-and-cup pair, to Class 3 precision. Outside Diameter: 5.7500 in (146.050 mm). Overall Width: 1.0313 in (26.195 mm). Series: 47800. Base Number: 47820. Precision Class: Class 3. Rolling Elements: Tapered Roller. Number Of Rows: 1. Bearing Material: Case-Carburized Steel. Item Weight: 1.9 kg (4.100 lb). Design Units: Imperial.

Decoding the designation

47820 — Timken inch cup number in the 47800 series, fixing the raceway angle and the 5.7500 in outside diameter.

-3 — Precision Class 3, written on this carton as *3 and also seen as #3. A tighter tolerance than standard, giving lower running vibration and closer shaft location.

What these specs mean in practice

e Factor: 0.45. Y Factor: 1.34. Geometry Factor (Cg): 0.143. These are Timken’s own calculation factors for equivalent load and for the lubrication life adjustment on this raceway geometry.

Class 3 holds the outside diameter and running accuracy to a tighter band than the standard class, so the cup seats closer to its nominal position in the housing and the assembled bearing runs quieter at speed.

Mounting data

Max Housing Fillet Radius: 0.130 in (3.30 mm) — the largest housing corner radius the cup corner clears. Housing Backing Shoulder Diameter, frontface (Da): 5.55 in (140 mm). Housing Backing Shoulder Diameter, backface (Db): 5.16 in (131.06 mm).

Quantity and configuration

Unit Quantity: 1 Pc. Cup only — one outer ring.

Interchange guidance

Timken pairs this cup with the 47890 and 47896 cones. The 47820 number is the shared inch cup designation and is carried at standard precision by SKF, NSK, Koyo, Fersa, Bower/BCA and PEER, and by NTN as 4T-47820; those are the same envelope at the standard tolerance class rather than at Class 3. Searchable variants: 47820-3, 47820*3, 47820 #3, 47820.