Page 12 - e3328g

6. Dust-proof Fig. 11 Rail cover

RA series is equipped with end, inner ✽ and bottom seals to prevent foreign matter from
entering the inside of the roller slide. Under normal applications, the RA series can be used
without modification.
For severe usage conditions, optional rail covers are available. Contact NSK for information
on how to mount the cover. The linear guide can also be equipped with a lubrication unit
NSK K1 that has already proven its effectiveness with other NSK Linear Guides.

Table 9 Optional parts for dust-proofing

Name Objective
NSK K1 Porous part containing oil enhances lubrication function.
Double seal Sealing effect is enhanced by using pairs of side seals.
Protector Removes large dust particles and protects side seals from hot and hard dust particles.
Rail cover✽✽ Covers top of rail to prevent foreign matter from getting in the rail mounting holes.
Bolt hole cap Prevents foreign matter such as cutting dust from collecting in the rail mounting holes.

✽ Inner seals for RA15 and RA20 are available as options. ✽✽ Rail cover is applicable to RA25 to RA65.

Fig. 12 View of the roller slide equipped with the dust-proof parts L
V1 End seal
(N ) NSK K1
Inner seal
End seal

Bottom seal

NSK K1 Case Unit

Installed with NSK K1

Table 10 Dimensions of roller slide assembly equipped with the optional parts Unit: mm

Roller slide length Protruding area
of the grease fitting
Model No. Roller slide shape code Standard roller slide Roller slide length Length of NSK K1
length installed with NSK K1 Case Unit N
RA15 AN, AL, EM V1 (3)
RA20 BN, BL, GM 70 79 4.5 (3)
RA25 85.4 94.4 4.5 (11)
RA30 AN, EM 86.5 95.5 5 (11)
RA35 BN, GM 106.3 115.3 6 (11)
RA45 AN, AL, EM 97.5 107.5 6.5 (14)
RA55 BN, BL, GM 115.5 125.5 7 (14)
RA65 AN, AL, EM 110.8 122.8 7 (14)
BN, BL, GM 135.4 147.4 7.5
AN, AL, EM 123.8 136.8
BN, BL, GM 152 165
AN, AL, EM 154 168
BN, BL, GM 190 204
AN, AL, EM 184 198
BN, BL, GM 234 248
AN, EM 228.4 243.4
BN, GM 302.5 317.5

Above dimensions are for the assembly length of a roller slide equipped with one of the optional dust-proof parts
on each end. Please consult with NSK for the dimensions when more than one kind of optional parts are used.

11