Malossi needle roller bearings are independent bearings that are ready for assembly and constructed from high-tensile steel with housings for the insertion and axial rotation of the rollers.

These devices are designed to allow reciprocal movement between two objects, constraining the rotation of the cage and housing the rotating elements with reduced overall dimensions, negligible weight and reduced friction.
These are essential components in internal combustion engines which, by definition, have several rotating elements.

As can be seen in the image, a needle roller bearing assembly is made up of a body (cage) with housings into which the rollers are positioned that are held in place but free to rotate axially. It is, indeed, on the rollers that the external rotating surface rests and rotation between the two components takes place on these.

As the parts are subject to continuous acceleration and deceleration and, as a consequence, to notable inertial forces, it is essential that the cage combines considerable lightness with high strength and precision machining, and that the rollers are perfectly cylindrical and selected and coupled in size classes with extremely tight tolerances of the order of microns.

The cage itself must be constructed with extremely tight tolerances as it must keep the rollers separate and guide them correctly. It should be noted that the slots into which the rollers are housed must be perfectly parallel to each other to prevent undesirable movement of the rotating elements and consequent adverse axial thrust, which would cause elevated levels of overheating and drastically reduce the life of the component.

Malossi has selected only the best needle roller bearings on the market to guarantee optimal performance and unparalleled reliability. Only components equipped with needle roller bearings with extremely tight tolerances that are constructed from heat-treated steel have been selected, with exceptional mechanical strength and hardness.

Limited to a selection of applications, the roller bearings have an aluminium surface protection that guarantees greater resistance to wear and even reduced rotational friction. For applications requiring even greater resistance, copper surface protection has been used, a material which, in addition to reducing friction and protecting from wear, ensures better heat dispersion, allowing the cage to function correctly even when subject to elevated loads in high temperature atmospheres.

CODE

Ø INTERNAL
mm

Ø EXTERNAL
mm

HEIGHT
mm

ROLLER
BEARINGS

SURFACE
PROTECTION

6613484B

10
13

14.3

Massive steel
Silver

66 3974B

10
13

14.5

Massive steel
---






6616783B
10

14

13

Massive steel
Coppered

66 3973B
12
15
15

Molded in sheet metal
---

6612961B
12
15
16.6

Molded in sheet metal
---

66 4151B
12
15
17.5

Massive steel
---

66 8102B
12

16
16
Massive steel
---

6611785B
12
17
16

Massive steel
---

66 3276B
13
16
14

Molded in sheet metal
---

6615509B
13
17
17.7

Massive steel
Coppered

6613807B
14
18
10

Massive steel
Silver

6618985B
14
18
16,7

Massive steel
Silver

66 7169B
15
18
14

Molded in sheet metal
---

66 3948B
15
19
20

Massive steel
---

66 8898B
16
20
20

Massive steel
---

66 6004B
16
20
23

Massive steel
---

66 5839B
16
21
10

Massive steel
---

66 7861B
16
22
12

Molded in sheet metal
Silver

66 9674B
18
24
12

Molded in sheet metal
Silver

 6618244 *
18
24
12.8

Massive steel
Silver

66 8897B
20
26
15

Massive steel
---

* Equipped with shim