SKFSingle-Row Angular Contact Ball Bearing 70 x 125 x 24 mm, 15° Contact Angle, Open

Product Description

What this part is

An SKF 7214 C single-row angular contact ball bearing, 70 mm bore x 125 mm outside diameter x 24 mm width (2.7559 x 4.9213 x 0.9449 in). One row of balls runs between raceways offset relative to each other, so the line of contact through the balls sits at 15° to the radial plane. The bore is cylindrical. Each ring carries one high and one low shoulder, and that asymmetry is what gives the type its one-directional thrust capacity and its back-to-back, face-to-face and tandem mounting behaviour.

Decoding the designation

72 denotes a single-row angular contact ball bearing in dimension series 02. 14 is the bore code for a 70 mm bore. C denotes a 15° nominal contact angle in the SKF scheme. TC is the SKF cage code carried on the ring marking. C78 and G5 are execution and matching codes carried on the ring marking, recorded here as searchable references.

What these specs mean in practice

A single-row angular contact ball bearing takes radial load together with thrust in one direction. The contact angle sets the split between the two. At 15° the contact line is close to radial, so the bearing favours speed and radial stiffness over thrust capacity: the ball load path is shorter, centrifugal ball loading and cage stress are lower, and the bearing tolerates higher speed than a steeper angle in the same envelope. A 25° sibling in the same envelope carries substantially more thrust and runs slower, and a 40° version more again. That trade is the reason contact angle appears in the designation rather than sitting as a detail in a table.

Because the row is single and one-directional, the type is mounted in sets. Back-to-back gives a wide effective load span and high resistance to overturning moments. Face-to-face gives a narrow span, more tolerance of shaft-to-housing misalignment and less moment stiffness. Tandem stacks two or more bearings facing the same way and multiplies thrust capacity in one direction. In a paired set the preload is fixed by the ground offset on the ring faces, which is what a matching code on the ring identifies.

The 15° angle makes this the family used on machine-tool and high-speed spindles, pumps, gearbox input shafts and screw-drive supports, where a combined radial and moderate thrust load runs continuously.

Published specifications

Bore d: 70 mm (2.7559 in), cylindrical. Outside diameter D: 125 mm (4.9213 in). Width B: 24 mm (0.9449 in). Nominal contact angle: 15°. Rows: 1. Rolling element: steel balls. Closure: open both sides.

Quantity and configuration

Bearing only. One piece per sale unit. Single row, open, no seals or shields.

Fitting notes

The cylindrical bore seats on a straight shaft journal. The high-shoulder side of each ring faces the thrust load, so orientation on the shaft determines which direction the bearing supports. In a paired arrangement the ground faces are brought together and the locknut is tightened until those faces meet, which establishes the built-in preload.

Interchange guidance

The ISO base number is 7214 C, the 15° execution of the 7214 envelope. Genuine same-angle equivalents in other schemes are the NSK 7214C, the NTN 7214C, the FAG 7214-C and the Koyo 7214C. Related sizes rather than interchanges: the 7214 AC and 7214 ACD carry 25°, the 7214 B, BE, BECBM and BECBP carry 40°, and the 3214 is the double-row bearing in the same envelope. Contact angle is the differentiating spec across all of them.