Product: Super Precision Cylindrical Roller Bearings

Short: SP CRB

Prefix: N single row and NN double row

ISO size: N 10 or NN 30

Roller Type: Cylindrical

Roller Material: Steel or Ceramic

Direction: Radial

Position: Non-locating

Separable: Y

Bore: Straight or Tapered

Cage: Brass (finger type), Polyamide (pocket type), or PEEK

Clearance: C1, C2, Special

Seals: no

Relive: groove and holes in outer ring in NN series optional

Tolerances: SP class 5 dimensions with Class 4 runout, or UP class 4 dimensions with Class 4 runout,

Applications: Spindle, Machine Tool, Grinding, Threading

Starting Bore Code range: 06 (30mm)

Common sizes: N1011, N1012, N1013, N1014, N1017, N1022, N1038, NN3006,  NN3007,  NN3008,  NN3010,  NN3011,  NN3012,  NN3013,  NN3014,  NN3015,  NN3016,  NN3017,  NN3018,  NN3020,  NN3021,  NN3022,  NN3026,  NN3030,  NN3032,  NN3040,  NN3044

Super Precision Cylindrical Roller Bearings of series N10xx and N30xx are top of the line rolling bearings known for runout control, rigidity, and high load ratings. Top manufacturers include SKF, Schaeffler FAG, NSK, and NTN.  The non-locating design makes these bearings ideal for float (expansion) positions and are usually paired with high contact angle axial thrust ball bearings like Schaeffler FAG’s double direction 2344 series or a pair of single row bearings in main spindles, threading machines, printing machines, and other machine tool.  

Radial internal clearance range is C1 as standard, while manufacturers can specify smaller or larger classes, or specific ranges.

Tapered bores of “K” suffix with 1:12 taper designed for mounting on tapered shafts allow assemblers to drive the inner ring and roller assembly axially up the taper.  This process, including the precise axial drive up distance, is used to set internal clearance in the bearing position when mated with the outer ring.  With straight bore bearings, mounted clearance is set by bench clearance of the bearing and the fits on the shaft and housing.  Minimizing internal clearance during operation increases the load zone and load distribution, roller stability, and operating life.

With the ever expanding requirements of machinery and tools to run faster, longer, and with less maintenance, manufacturers have turned to additional finishing processes of raceways, including honing, to reduce friction and increase limiting speeds.  Known for durability and precision, Schaeffler FAG revised their line up to bore code 24 to include their x-life quality and lightweight TVP polyamide cages which delivered higher speeds and load ratings.  NTN specializes in high speed applications, offering both HS high speed and HSR ultra high speed designs.  HS designs use lightweight brass cages and honed rolling surfaces, while their HSR design adds a PEEK cage, a material known for low weight, high strength, and high stability.  Manufacturers have also turned to ceramic cylindrical rollers to create hybrid bearings, with benefits matching those of hybrid ceramic ball type spindle bearings: speed, lower friction, lower temperatures, less deflection, and better mixed friction (inadequate lubrication) operating conditions.

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