TimkenTapered Roller Bearing Cone and Cup Assembly – 0.8750 in Bore, 1.6563 in OD, Class 3 Precision, Inch LL Series

Product Description

What this part is

Timken LL52549 / LL52510 inch tapered roller bearing, supplied as the complete cone and cup assembly. Bore Diameter: 0.8750 in (22.225 mm). Outside Diameter: 1.6563 in (42.070 mm). Overall Width: 0.4400 in (11.176 mm). Inner Ring Width B: 0.4400 in (11.176 mm). Outer Ring Width C: 0.3400 in (8.636 mm). Series: LL52500. Base Number: LL52549. Number Of Rows: 1. Rolling Elements: Tapered Roller. Bore Type: Straight. Bearing Material: Steel. Precision Class: Class 3. Item Weight: 0.10 kg (0.10 lb).

Decoding the designation

LL — the Timken extra-light inch section, giving a slim cross-section for the bore size and a low mass for the envelope.

52549 — the cone base number, fixing the 0.8750 in bore and the roller path.

LL52510 — the mating cup, fixing the 1.6563 in outside diameter and the housing seat.

-90013 — the Timken complete-assembly order number for the matched cone and cup as supplied together.

*3 — precision Class 3, written interchangeably as *3, -3 or #3. Class 3 holds tighter bore and running tolerances than standard, giving lower running vibration and closer shaft location.

What these specs mean in practice

Dynamic Load Rating: 16,600 N (3,730 lbf) at 1 million revolutions. Static Load Rating: 16,800 N (3,770 lbf). Dynamic Radial Load Rating C90: 4,300 N (966 lbf). Dynamic Axial Rating Ca90: 2,920 N (655 lbf). e Factor: 0.4. K Factor: 1.47. Y Factor: 1.51. Geometry Factor Cg: 0.0431. G1 Factor: 4.7. G2 Factor: 8.62. The e factor of 0.4 marks the thrust-to-radial ratio above which the thrust term governs rating life, and a K factor of 1.47 gives this small assembly a useful thrust share for its size.

Mounting data

Effective Center Location: -0.07 in (-1.8 mm), inside the cone backface. Max Shaft Fillet Radius: 0.050 in (1.270 mm). Max Housing Fillet Radius: 0.050 in (1.27 mm). Shaft Backing Shoulder Diameter Frontface da: 1 in (25.5 mm). Shaft Backing Shoulder Diameter Backface db: 1.08 in (27.5 mm). Housing Backing Shoulder Diameter Frontface Da: 1.59 in (40.39 mm). Housing Backing Shoulder Diameter Backface Db: 1.44 in (36.58 mm). Cage Location Relative To Backface Aa: -0.02 in (-0.5 mm). Cage Location Relative To Frontface Ab: 0.07 in (1.8 mm).

Quantity and configuration

Unit Quantity: 2 Pcs. One LL52549 cone and one LL52510 cup, supplied together as the complete -90013 assembly.

Interchange guidance

The LL52549 and LL52510 numbers are carried across the inch tapered roller programme by SKF, FAG, NSK, NTN, Koyo and Fersa on the same envelope. MPN Variants: LL52549-90013, LL52549/LL52510, LL52549, LL52510, LL52549 *3, LL52549 #3.