Timken77375/77676XSingle-Row Tapered Roller Bearing Cone and Cup – 3.7500 in Bore, 6.7500 in Outside Diameter, Straight Bore, Open, Case-Carburized Steel

Product Description

What this part is:

Timken 77375/77676X single-row tapered roller bearing, cone and cup, Series 77000, inch design. Bore Diameter: 3.7500 in (95.250 mm). Outside Diameter: 6.7500 in (171.450 mm). Cone inner ring width (B): 1.9000 in (48.260 mm). Rolling Elements: Tapered Roller. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Bearing Material: Case-carburized steel. Lubricant: grease or oil.

Decoding the designation:

77375 — Timken inch tapered roller cone, Series 77000, 3.7500 in bore.

77676X — the mating cup, an outer ring on the same 6.7500 in raceway envelope as the 77675.

What these specs mean in practice:

Dynamic Load Rating: 403,000 N (90,500 lbf). Static Load Rating: 474,000 N (107,000 lbf). Dynamic radial rating at 90 million revolutions (C90): 104,000 N. Dynamic axial rating at 90 million revolutions (Ca90): 65,600 N.

K Factor: 1.59. e Factor: 0.37. Y Factor: 1.63. Geometry Factor (Cg): 0.102. G1 Factor: 206. G2 Factor: 37.7. The K factor sets the ratio of radial to thrust capacity: at 1.59 this is a general-purpose taper angle that carries a heavy radial load while still taking substantial one-direction thrust, which is why the type is normally mounted in opposing pairs.

A tapered roller bearing separates into two parts. The cone carries the inner raceway, the rollers and the cage; the cup is the outer raceway. Both are supplied here.

Mounting data:

Shaft backing shoulder diameter at the frontface (da): 4.17 in (106 mm). Shaft backing shoulder diameter at the backface (db): 4.45 in (113 mm). Maximum shaft fillet radius cleared by the bearing corner: 0.140 in (3.600 mm). Maximum housing fillet radius cleared by the bearing corner: 0.130 in (3.30 mm). Cage location relative to the cone backface (Aa): 0.11 in (2.8 mm). Cage location relative to the cone frontface (Ab): 0.07 in (1.8 mm).

Quantity and configuration:

Unit Quantity: 2 Pcs — one 77375 cone and one 77676X cup, supplied together as a matched cone-and-cup pair.

Interchange guidance:

77375 and the 776xx cup numbers are standard inch tapered roller designations, listed under the same numbers by SKF, FAG, NSK, NTN, Koyo, Nachi, Bower/BCA and Fersa. The 77375 cone also runs against the 77675 plain cup and the flanged 77675-B and 77676-BW cups. Series: 77000. Searchable variants: 77375/77676X, 77375-77676X, 77676-X and 77676X.