Timken78225/78551Tapered Roller Bearing Cone and Cup — 2-1/4 in Bore, 5.513 in OD, 1.4375 in Width, Single Row

Product Description

What this part is

Timken 78225/78551 single-row TS tapered roller bearing, supplied as the cone and its matching cup. Cone Part Number: 78225. Cup Part Number: 78551. Bore Diameter: 2-1/4 in (57.150 mm). Outside Diameter: 5.5130 in (140.030 mm). Total Width: 1.4375 in (36.513 mm). Cone Width: 1.3085 in (33.236 mm). Cup Width: 0.9260 in (23.520 mm). Item Weight: 2.6 kg (5.7 lb). Precision Class: Not specified. Rolling Elements: Tapered Roller. Brand: Timken. GTIN: 0013992318794.

Decoding the designation

78225 — the cone: inner ring with its rollers and cage.

78551 — the cup: the outer race the rollers run against.

What these specs mean in practice

Dynamic Radial Load Rating, 1M revs (C1): 203,000 N (45,600 lbf). Dynamic Radial Load Rating, 90M revs (C90): 52,600 N (11,800 lbf). Dynamic Axial Rating, 90M revs (Ca90): 77,900 N (17,500 lbf). Static Load Rating (C0): 193,000 N (43,400 lbf). e Factor: 0.87. K Factor: 0.67. Y Factor: 0.69. The steep taper (e 0.87) gives this bearing a high thrust capacity relative to its radial rating.

Mounting data

Effective Center Location: 0.31 in (7.9 mm). Maximum Shaft Fillet Radius: 0.140 in (3.600 mm). Maximum Housing Fillet Radius: 0.090 in (2.29 mm). Shaft Backing Shoulder Diameter, Frontface (da): 3.03 in (77 mm). Shaft Backing Shoulder Diameter, Backface (db): 3.27 in (83 mm). Housing Backing Shoulder Diameter, Frontface (Da): 5.22 in (132.59 mm). Housing Backing Shoulder Diameter, Backface (Db): 4.61 in (117.09 mm).

Quantity and configuration

Unit Quantity: 1 Pc. One cone and one cup, a complete single-row bearing.

Interchange guidance

Related Part: Timken 78225C/78551, a higher-capacity cone on the same cup. MPN Variants: 78225/78551, 78225-78551, 78225 78551.