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Roller Guide RA Series

8. Maximum rail length

Table15 shows the limitations of rail length. However, the limitations vary by accuracy grades.

Table 15 Length limitation of rails Unit: mm

Size RA15 RA20 RA25 RA30 RA35 RA45 RA55 RA65
Length 2 000 3 000 3 000 3 500 3 500 3 500 3 500 3 500

Note: Rails can be butted if user requirement exceeds the rail length shown in the table.
Please consult NSK.

Handling Precautions

➀ Operating temperature limits should normally be less than 80˚C.
➁ If using NSK K1™, service temperature should not exceed 50˚C (or 80˚C instantaneously). Make sure the

unit does not come in contact with organic solvents with that can be used for degreasing. Do not place
the unit in a location exposed to white kerosene or rust prevention oil containing white kerosene.
➂ When transferring the roller slide onto the rail, or vice versa:
• Do not remove an unnecessary roller slide from the rail as much as you can.
• Use the provided provisional rail to prevent dents or scratches on the

raceways caused by the roller slide that is jammed into the one from
the other. It also prevents the rollers from dropping.
• When transferring the roller slide onto the rail, or vice versa, butt the
provisional rail up against the rail and slide it directly from one onto
the other.
• U se a clean provisional rail. Do not use the provisional rail that is
contaminated with particles or uses different grease from that of the
relevant roller slide.

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