Page 314 of Needle Roller Bearings by NTN Corporation Japan

linear roller bearings ntn linear roller bearings this roller bearing with cylindrical rollers having the function capable of circulating within the raceway block ensures smooth infinite linear motion on a flat surface the cylindrical rollers are retained and guided by the cage and the ribs of the raceway block the cage is of such a construction as not allow adjacent rollers to contact with one another hence the friction coefficient is low requirements and tolerances for raceway surface and mounting surface table 2 shows the requirements and tolerances for the raceway surface on which linear roller bearing rolls and the bearing mounting surface where adhesion of a hard foreign matter to the raceway surface is forecast the raceway surface must be protected with a proper protective cover the reference surface for mounting is the back face and opposite face to ntn mark table 2 requirements for raceway surface and mounting surface characteristics raceway surface roughness max raceway surface hardness effective hardened layer depth of raceway surface min parallelism of mounting surface x see fig 2 see fig 3 0.05 mm per 100 mm 0.01 mm per 100 mm allowable value or tolerance range 0.2a hrc58 64 as described in applicable dimensions table fig 1 y bearing accuracy all the linear roller bearings are manufactured within the dimensional tolerance range of 0 to -2.5 m for bearing height h and these bearings are delivered classified into 5-stepped tolerance classes see table 1 table 1 classification of bearing height h by accuracy class unit m ntn mark here fig 2 class code 1h 2h 3h 4h 5h tolerance for height h 0 5 10 15 20 5 10 15 20 25 fig 3 how to mount fix linear roller bearing using the tapped holes which are provided on the mounting reference surface see fig 4 fig 4 b-252

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