Timken47487-3/47420-3Tapered Roller Bearing Cone and Cup — 2.7500 in (69.850 mm) Bore, 4.7244 in (120 mm) OD, 1.2813 in Width, Class 3

Product Description

What this part is

Timken 47487-3/47420-3 is a single-row tapered roller bearing made to precision Class 3: one 47487 cone and one 47420 cup. Bore Diameter: 2.7500 in (69.850 mm). Outside Diameter: 4.7244 in (120.000 mm). Overall Width: 1.2813 in (32.545 mm). Cone Width: 1.2813 in (32.545 mm). Cup Width: 1.0313 in (26.195 mm). Item Weight: 1.50 kg (3.2 lb). Precision Class: Class 3. Rolling Elements: Tapered Roller.

Decoding the designation

47487 — Timken inch-series cone in the 47400 series, 2.7500 in bore.

47420 — the matching single cup, 4.7244 in (120 mm) OD.

-3 — Class 3 precision: tighter bore, OD, width and runout tolerances than standard Class 2 for smoother, lower-vibration running.

What these specs mean in practice

Dynamic Load Rating: 179,000 N (40,200 lbf), Timken C1 at 1 million revolutions. Dynamic Radial Rating C90: 46,300 N (10,400 lbf). Dynamic Axial Rating Ca90: 28,600 N (6,420 lbf). Static Load Rating: 249,000 N (56,000 lbf). e Factor: 0.36. K Factor: 1.62. Y Factor: 1.67. The 120 mm cup OD fits a metric housing bore.

Mounting data

Effective Center Location: -0.25 in (-6.4 mm). Max Shaft Fillet Radius: 0.140 in (3.600 mm). Max Housing Fillet Radius: 0.130 in (3.30 mm). Shaft Backing Shoulder Diameter, Frontface (da): 3.07 in (78 mm). Shaft Backing Shoulder Diameter, Backface (db): 3.31 in (84 mm). Housing Backing Shoulder Diameter, Frontface (Da): 4.53 in (115.06 mm). Housing Backing Shoulder Diameter, Backface (Db): 4.21 in (106.93 mm).

Quantity and configuration

Unit Quantity: 2 Pcs, one cone and one cup forming one complete single-row bearing.

Interchange guidance

47487/47420 is an ABMA standard inch set also produced by SKF, NTN (4T-47487/47420), Koyo and Bower; Class 3 is a Timken precision grade on the same envelope.