SKF Needle roller bearings

SKF Needle Bearing without Inner Ring, NK 28/20 28x37x20

Needle bearings of type RNA 49, RNA 69, NK, and NKS. Needle bearings with raceways made of rolling bearing steel are low-profile bearings with relatively high load capacity. Bearings without inner rings provide an optimal solution for applications where the shafts can be hardened and ground. Since the inner ring is omitted, the shaft can be designed to be stronger and thus stiffer. The axial displacement of the shaft relative to the housing depends solely on the width of the raceway on the shaft. Bearings with flanges on the outer ring are primarily designed as single-row bearings. In all cases, the outer ring, needle rollers, and cage form a self-retaining unit. Bearings of the RNA 49 series are also available with sealing rings. This effectively protects the bearings against the ingress of contaminants and the escape of lubricating grease. Main dimensions: ISO 15:2011 / DIN 620:2000 / ISO 1206:2001 / DIN 617:1993 for bearings of the (R)NA 48, (R)NA 49, and (R)NA 69 series.

Prefix: RNA 49 / RNA 69 needle bearings with flanges on the outer ring, without inner ring. NK / NKS needle bearings with flanges on the outer ring, without inner ring.

Suffix: 2RS steel sheet metal contact seals made of acrylonitrile-butadiene rubber (NBR) on both sides. TN glass fiber reinforced cage made of polyamide 66.