Timken566-3Tapered Roller Bearing Cone – 2.7500 in Bore, 1.4240 in Width, Class 3, K Factor 1.61

Product Description

What this part is:

Timken 566-3 tapered roller bearing cone. This is the inner ring with its tapered roller set and cage, the rotating half of a Timken TS single-row inch tapered roller bearing, built to Class 3 precision. Bore Diameter: 2.7500 in (2-3/4 in, 69.850 mm). Overall Width: 1.4240 in (36.170 mm) inner ring width. Item Weight: 4.57 kg (10.08 lb). Dynamic Load Rating: 196,000 N (44,100 lbf) at C1. Static Load Rating: 262,000 N (58,900 lbf). Precision Class: Class 3. Rolling Elements: Tapered Roller. Number Of Rows: 1. Bore Type: Straight. Cage Type: Pressed. Bearing Material: case-carburized alloy steel. Design Units: Imperial. Series: 560. Base Number: 566.

Decoding the designation:

566 — a cone number in Timken’s inch 560 tapered roller series, fixing the 2.7500 in bore and the 1.4240 in inner ring width.

-3 — Precision Class 3, also written *3 and #3. A tighter tolerance than standard, giving lower running vibration and closer location of the shaft. The class changes tolerance only; the bore, width, raceway angle and load ratings are those of the 566.

What these specs mean in practice:

K Factor: 1.61. The K factor is the ratio of radial to thrust capability in the mounted bearing. At 1.61 the taper is moderate: the bearing is weighted toward radial load with a useful thrust reserve, which is the general-purpose choice for a shaft carried on an opposed pair.

Dynamic Load Rating: 196,000 N (C1, at 1 million revolutions, ISO method). Dynamic Radial Load Rating at 90 million revolutions (C90): 50,900 N. Dynamic Axial Rating at 90 million revolutions (Ca90): 31,700 N. Static Load Rating: 262,000 N.

G1 Factor: 101.3. G2 Factor: 24. Geometry Factor (Cg): 0.117, the geometry constant for the lubrication life adjustment factor a3l.

Mounting data:

Maximum Shaft Fillet Radius: 0.140 in (3.600 mm) — the largest fillet the shaft shoulder may carry and still be cleared by the cone corner. Shaft Backing Shoulder Diameter, frontface (da): 3.07 in (78 mm). Shaft Backing Shoulder Diameter, backface (db): 3.35 in (85 mm). Effective Centre Location: -0.32 in (-8.1 mm); the negative value places the effective load centre inside the cone backface, which is what sets the true bearing spread when the mounting span is calculated. Cage Location relative to backface (Aa): 0.10 in. Cage Location relative to frontface (Ab): 0.11 in.

Quantity and configuration:

Unit Quantity: 1 Pc. Cone only — inner ring, rollers and cage. The matching cups are the Timken 563 and 562.

Interchange guidance:

566 is an inch tapered roller cone number on the common industry dimensional standard, so a 566 from another inch-series maker carries the same bore, width and raceway angle. The Class 3 tolerance is a Timken execution, so a standard-tolerance 566 matches the envelope but not the running accuracy. Cross-references: Koyo 566, NTN 4T-566, NSK 566, Bower / BCA 566, Fersa 566.