Product Details:
Cageless needle roller bearings, also known as narrow needle roller bearings, consist of an outer ring, inner ring, cage, and needle assembly. These bearings are widely used in various machinery, such as automobiles, machine tools, textile machinery, printing machinery, etc. They can withstand significant radial loads. Available with or without inner rings, they feature G2-grade needles with an average diameter deviation of less than 2um, and are equipped with high-rigidity cages to accurately guide needles parallel to the axis.
Primary structural form:
| Bearing Code | Structural Features |
| NK NKS RNA49 RNA48 | Outer double flanged, single row, no inner race |
| NKI NKIS NA49 NA48 | Outer ring double flanged, single row, with inner ring |
| RNA69 | Outer double flanged, double row, no inner ring |
| NA69 | Outer diameter double joint edge, double row, with inner diameter |
| RNA49..RS RNA49..2RS | Single-sided sealed or double-sided sealed |
| NA69.. RS NA69..2RS | Single-sided or double-sided sealing | Double-sided |
| RNAO | Outer ring without flange, single or double row, no inner ring |
| NAO | Outer diameter without flange, single or double row, with inner diameter |
| RNAV | Outer double flanged, single row, no inner ring |
| NAV | Outer double flanged, single row, with inner ring |
Outer Ring, Inner Ring
Material: GCr15 bearing steel
Processed: Turned and Ground
Heat Treatment: Quenching (with special request for high-temperature tempering)
Retaining Rack
Material: Typically ST12 low carbon steel
Processing: Punched and stretched into shape after stamping, then perforated
Heat Treatment: Carbonitriding; Blackening
Roller Needle
Material: GCr15 bearing steel
Machining: Processed by a grinding machine
Heat Treatment: Quenching HRc60-64
