Timken3783/3732Tapered Roller Bearing Assembly, Cone & Cup – Straight Bore, 1.7500 in ID, 3.8750 in OD, 1.1875 in Assembled Width, Open, Pressed Steel Cage

Product Description

What this part is

Timken 3783/3732 inch tapered roller bearing, single row, supplied as a matched cone and cup. Manufacturer: Timken. Manufacturer Part Number: 3783/3732. Cone Part Number: 3783. Cup Part Number: 3732. Series: 3700. Bearing Type: Tapered Roller Bearing Assembly, TS single row. Number of Rows: 1. Rolling Elements: Tapered Rollers. Design Units: Inch. Bore: 1.7500 in (44.450 mm). Outside Diameter: 3.8750 in (98.425 mm). Assembled Width: 1.1875 in (30.163 mm). Inner Ring Width: 1.1930 in (30.302 mm). Outer Ring Width: 0.9375 in (23.813 mm). Bore Type: Straight. Closure Type: Open. Cage Type: Pressed steel. Cage Material: Steel. Bearing Material: Case-Carburized Steel. Precision Class: Not specified. Item Weight: 2.4 lb (1.1 kg). Unit Quantity: 2 Pcs.

Decoding the designation

Timken names this bearing by its cone and cup pair: cone 3783 against cup 3732, both in the 3700 inch series. Searchable forms of the number are 3783/3732, 3783 / 3732, 3783-3732 and 3783 3732.

What these specs mean in practice

Dynamic Radial Load Rating C1, ISO method at 1 million revolutions: 27,500 lbf (122,000 N). Dynamic Radial Load Rating C90, Timken method at 90 million revolutions: 7,120 lbf (31,700 N). Dynamic Axial Rating Ca90: 4,120 lbf (18,300 N). Static Radial Load Rating C0: 34,300 lbf (153,000 N). e Factor: 0.34. K Factor: 1.73. Y Factor: 1.77. G1 Factor: 49.9. G2 Factor: 14.5. Geometry Factor Cg: 0.0903. Limiting Speed: 4,400 rpm. These are the ratings for the complete single-row assembly. The K factor of 1.73 gives a moderately steep raceway angle, so this bearing carries a useful thrust share alongside its radial load, and the Y factor of 1.77 converts a thrust component into an equivalent radial load once the axial-to-radial ratio passes the e value of 0.34. C1 and C90 are two different life bases for the same bearing and are not interchangeable in a calculation. Maximum Temperature: 120°C. Minimum Temperature: −54°C. Harmonization Code: 8482.20.00.

Mounting dimensions

Effective Center Location: −0.32 in (−8.1 mm), which places the effective centre inside the cone backface. Maximum Shaft Fillet Radius: 0.25 in (6.4 mm). Maximum Housing Fillet Radius: 0.130 in (3.30 mm). Shaft Backing Shoulder Diameter, frontface (da): 2.05 in (52 mm). Shaft Backing Shoulder Diameter, backface (db): 2.52 in (64 mm). Housing Backing Shoulder Diameter, frontface (Da): 3.56 in (90.42 mm). Housing Backing Shoulder Diameter, backface (Db): 3.31 in (84.07 mm). Cage Location relative to the backface (Aa): 0.06 in. Cage Location relative to the frontface (Ab): 0.06 in. The 0.25 in shaft fillet allowance is generous for this envelope, which suits a shaft step cut with a large radius for fatigue strength.

Quantity and configuration

Unit Quantity: 2 Pcs. One cone assembly — the inner ring with its tapered roller set and pressed steel cage — and one matching cup, the 3732 outer ring. Together they make one complete single-row tapered roller bearing.

Cone and cup mating

Cone 3783 runs against cup 3732, and Timken designates the assembly by that pair rather than by a separate assembly number. The cup carries no bore, no cage and no roller set: it is the outer race alone, and its raceway angle is cut to match the 3783 cone.

Interchange guidance

Cross-Reference 1: SKF 3783/3732. Cross-Reference 2: NTN 4T-3783/3732. Cross-Reference 3: Bower 3783/3732. All three are the same 1.7500 x 3.8750 x 1.1875 in envelope on the same raceway geometry. The NTN 4T prefix denotes the cone half in that maker’s scheme.