SKF7008CTCC78Single-Row Angular Contact Ball Bearing, 40 x 68 x 15 mm, 15 Degree Contact Angle, Open

Product Description

What this part is

An SKF 7008 C single-row angular contact ball bearing, 40 mm bore, 68 mm outside diameter, 15 mm width, open on both faces. The ball contact line runs at an angle across the raceways rather than radially, so the bearing carries thrust in one direction together with radial load, and a second bearing mounted opposed is what locates a shaft in both directions.

Decoding the designation

The 70 dimension series is the light angular contact series, and the bore code 08 gives 40 mm. The C is SKF’s 15° contact angle designation, distinct from AC at 25° and from the B designation at 40°. The trailing TC and C78 blocks are not part of the published SKF suffix scheme and are carried here as searchable references rather than as specifications. The Fafnir 2MM9108WI designation that appears on cartons of this size is the same 40 x 68 x 15 mm envelope at the same 15° angle.

What these specs mean in practice

Contact angle is the figure that decides how the bearing behaves. A 15° angle is the high-speed end of the range: it carries less thrust than a 25° or 40° bearing of the same envelope, but generates less heat and runs faster, and it is stiffer radially for a given preload. The light 70 series keeps outside diameter and width small for a 40 mm shaft, which is why this envelope recurs in spindle noses and pump ends where housing space is fixed by the surrounding design rather than by the load.

Quantity and configuration

1 Pc. Single row, straight bore, open both faces.

Fitting notes

The rings of an angular contact bearing have a distinct wide face and narrow face, and the direction the bearing goes in decides which way it takes thrust. Mounting force is applied through the ring being fitted rather than across the balls, and the shaft and housing seats are ground and measured, since a loose or out-of-round seat removes the accuracy the bearing was bought for.

Interchange guidance

Same-envelope, same-angle equivalents are FAG B7008-C-T-P4S, NSK 7008CTR, NTN 7008C and Fafnir 2MM9108WI, all 40 x 68 x 15 mm at 15°. A 7008 AC or 7008 ACD is 25° and a 7008 B is 40° in the same envelope, and a 7208 is the heavier 72 series at the same bore; those are related sizes rather than substitutions, because changing the angle changes both the thrust rating and the stiffness of the mounted pair.