Timken28580-3/28521-B-3Tapered Roller Bearing Cone and Flanged Cup Set – 2.0000 in Bore, 3.6250 in Outside Diameter, Class 3 Precision

Product Description

What this part is:

Timken 28580-3/28521-B-3 inch tapered roller bearing set, a TSF assembly pairing the 28580 single cone with the 28521-B single flanged cup, both to Class 3 precision. Unit Quantity: 2 Pcs. One 28580-3 cone and one 28521-B-3 flanged cup, supplied together as the matched Class 3 set.

Decoding the designation:

28580 — the cone number in the 28500 inch series, fixing the 2.0000 in bore and the raceway angle.

28521-B — the cup number. The B marks a flanged outer ring, a distinct part from the plain 28521.

-3 — Precision Class 3, written on the carton as *3. A tighter tolerance than standard.

Specifications:

Precision Class: Class 3. Rolling Elements: Tapered Roller. Number Of Rows: 1. Bore Type: Straight. Bearing Material: Case-Carburized Steel. Series: 28500. Base Number: 28580. Design Units: Imperial. Dynamic Load Rating: 98,900 N (22,200 lbf) at 1 million revolutions. Static Load Rating: 130,000 N (29,200 lbf). Dynamic Radial Rating C90: 25,700 N (5,770 lbf). Dynamic Axial Rating Ca90: 16,600 N (3,720 lbf). K Factor: 1.55. e Factor: 0.38. Y Factor: 1.59. G1 Factor: 46.4. G2 Factor: 22.6. Geometry Factor (Cg): 0.0912. Item Weight: 0.8 kg (1.7 lb) cone and 0.8 kg (1.7 lb) cup.

Dimensions and mounting:

Bore Diameter: 2.0000 in (50.8 mm). Outside Diameter: 3.6250 in (92.075 mm). Cone Width: 1.0000 in (25.400 mm). Cup Width: 0.7813 in (19.845 mm). Outer Ring Flange Outside Diameter (D1): 3.7772 in (95.941 mm). Outer Ring Flange Width (C2): 0.1562 in (3.967 mm). Effective Center Location: -0.19 in (-4.8 mm). Max Shaft Fillet Radius: 0.140 in (3.600 mm). Max Housing Fillet Radius: 0.03 in (0.8 mm). Shaft Backing Shoulder Diameter, frontface (da): 2.24 in (57 mm). Shaft Backing Shoulder Diameter, backface (db): 2.48 in (63 mm). Housing Backing Shoulder Diameter, frontface (Da): 3.54 in (89.90 mm). Cage Location relative to backface (Aa): 0.04 in (1 mm). Cage Location relative to frontface (Ab): 0.06 in (1.5 mm).

Compatibility and replacement:

Set of Timken cone 28580-3 and flanged cup 28521-B-3. The plain cup 28521 is a different part from the flanged 28521-B. Carton forms: 28580-3/28521B-3, 28580 *3 28521-B *3, 28580#3, 28521B*3, 28580/28521-B.

Frequently asked questions:

What is in the Timken 28580-3/28521B-3 set?

One 28580-3 single cone and one 28521-B-3 single flanged cup.

What are the bore and outside diameter?

Bore Diameter 2.0000 in (50.8 mm), Outside Diameter 3.6250 in (92.075 mm).

What precision class is it?

Class 3, marked -3 or *3.