SKF Needle roller bearings

SKF Needle roller bearings with inner ring, NKI 42/30 42x57x30

Needle roller bearings type NA 49, NA 69, NKI and NKIS
Needle roller bearings with raceways made of carbon chromium bearing steel are bearings with a low sectional height and a relatively high load carrying capacity. Needle roller bearings with an inner ring are used for applications where the shaft cannot be hardened and ground. The permissible axial displacement of the shaft relative to the housing is limited.
The bearings with flanges on the outer ring are designed primarily as single-row bearings. In every instance the outer ring, needle rollers and cage constitute a self-retaining unit. Bearings of the NA 49 series are also available with contact seals (suffix 2RS). This provides the bearings with effective protection against infiltration of pollutants and against leakage of lubrication grease. The sealed bearings' inner ring is designed 1 mm wider and has a lubrication hole. This ensures that the bearings continue to be effectively sealed even in the event of small axial displacements of the shaft relative to the housing.
Main dimensions: ISO 15:2011 / DIN 620:2000 / ISO 1206:2001 / DIN 617:1993 at the bearings with row (R)NA 48, (R)NA 49 und (R)NA 69

Prefixes:
NA 49 / NA 69 Needle roller bearings with flanges on the outer ring, with inner ring
NKI / NKIS Needle roller bearings with flanges on the outer ring, with inner ring

Suffixes:
2RS Sheet steel reinforced contact seals of acrylonitrile-butadiene rubber (NBR) on both side
TN Injection moulded cage of polyamide 66, the cage is glass fibre reinforced.