Timken33261Tapered Roller Bearing Cone – 2.6250 in Bore, 1.1875 in Width, K Factor 1.34

Product Description

What this part is

Timken 33261 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. Bore Diameter: 2.6250 in (2-5/8 in, 66.675 mm). Overall Width: 1.1875 in (30.163 mm) inner ring width. Item Weight: 3.50 kg (7.71 lb). Dynamic Load Rating: 138,000 N (31,100 lbf) at C1. Static Load Rating: 197,000 N (44,300 lbf). GTIN: 053893261911. Rolling Elements: Tapered Roller. Number Of Rows: 1. Bore Type: Straight. Cage Type: Pressed. Bearing Material: case-carburized alloy steel. Design Units: Imperial. Series: 33000. Base Number: 33261.

Decoding the designation

33261 — a cone number in Timken’s inch 33000 tapered roller series, fixing the 2.6250 in bore and the 1.1875 in inner ring width.

No precision suffix is present on this part. Precision Class: Not specified.

What these specs mean in practice

K Factor: 1.34. A K factor of 1.34 is a steep taper: a large share of the capacity goes into thrust, so the bearing suits a position carrying combined radial and axial load rather than pure radial duty.

Dynamic Load Rating: 138,000 N (C1, at 1 million revolutions, ISO method). Dynamic Radial Load Rating at 90 million revolutions (C90): 35,900 N. Dynamic Axial Rating at 90 million revolutions (Ca90): 26,800 N. Static Load Rating: 197,000 N.

G1 Factor: 84.2. G2 Factor: 25.9. Geometry Factor (Cg): 0.116, the geometry constant for the lubrication life adjustment factor a3l.

Mounting data

Maximum Shaft Fillet Radius: 0.220 in (5.600 mm) — the largest fillet the shaft shoulder may carry and still be cleared by the cone corner, and a generous allowance that suits a shaft with a large relief radius at the step. Shaft Backing Shoulder Diameter, frontface (da): 2.95 in (75 mm). Shaft Backing Shoulder Diameter, backface (db): 3.35 in (85 mm). Effective Centre Location: -0.11 in (-2.8 mm); the negative value places the effective load centre inside the cone backface. Cage Location relative to backface (Aa): 0.07 in. Cage Location relative to frontface (Ab): 0.07 in.

Quantity and configuration

Unit Quantity: 1 Pc. Cone only — inner ring, rollers and cage. The matching cups are the Timken 33461 and 33462.

Interchange guidance

33261 is an inch tapered roller cone number on the common industry dimensional standard, so a 33261 from another inch-series maker carries the same bore, width and raceway angle and is a direct substitution. Cross-references: Koyo 33261, NTN 4T-33261, NSK 33261, Bower / BCA 33261, Fersa 33261.