Timken29685-3Tapered Roller Bearing Single Cone – 2.8750 in Bore, 1.0000 in Width, Class 3 Precision, Case-Carburized Steel

Product Description

What this part is:

Timken 29685-3 inch tapered roller bearing single cone, Series 29600. The cone is the inner ring complete with its tapered roller complement and cage. Bore Diameter: 2.8750 in (73.025 mm). Overall Width: 1.0000 in (25.400 mm). Rolling Elements: Tapered Roller. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Pressed steel. Bearing Material: Case-carburized steel. Item Weight: 2.01 kg (4.43 lb). Series: 29600. Base Number: 29685.

Decoding the designation:

29685 — Series 29600 inch tapered roller cone on a 2.8750 in bore.

-3 — Precision Class 3: a tighter dimensional tolerance than standard, giving lower running vibration and closer shaft location.

What these specs mean in practice:

Dynamic Load Rating: 111,000 N (24,800 lbf), rated at one million revolutions. Static Load Rating: 166,000 N (37,200 lbf). Dynamic radial rating at 90 million revolutions (C90): 28,600 N. Dynamic axial rating at 90 million revolutions (Ca90): 23,900 N. K Factor: 1.2. Precision Class: Class 3. The tapered raceway carries radial and axial load in the same bearing, and the K factor of 1.2 sets the ratio between the two for the mounting calculation. Case-carburized steel gives a hard raceway over a tough core, which is what lets the roller path take shock loading.

Mounting data:

Maximum shaft fillet radius cleared by the cone corner: 0.140 in (3.600 mm). Shaft backing shoulder diameter, frontface (da): 3.15 in (80 mm). Shaft backing shoulder diameter, backface (db): 3.39 in (86 mm). Cage location relative to the backface (Aa): 0.08 in (2 mm). Cage location relative to the frontface (Ab): 0.08 in (2 mm). Effective centre location: 0.04 in (1 mm). G1 Factor: 77.7. G2 Factor: 43.3. Geometry Factor (Cg): 0.117.

Quantity and configuration:

Cone only. Unit Quantity: 1 Pc. The matching Timken single cups are the 29620, the 29622W and the 29630.

Interchange guidance:

The 29685 cone number is an industry-standard inch designation, so SKF, FAG, NSK, NTN, Koyo, Nachi, PEER and Bower all catalogue a 29685 cone on the same envelope and the same K factor. Those are built to standard tolerance; the -3 marking on this piece is the tighter Class 3 execution. Searchable forms of the number: 29685-3, 29685*3, 29685#3, 29685 3 and 296853.