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Roller Guide RA Series

2. Accuracy

Four accuracy grades are available: ultra super precision P3, super precision P4, high precision P5, and precision P6.

Table 1 Accuracy standards Unit: mm

Accuracy standards Ultra super Accuracy grades Precision Random-matching
precision Super precision High precision Precision
P6 P6
Mounting height: P3 P4 P5 ±0.040 ±0.020
Dimensions in mounting height H ±0.008 ±0.010 ±0.020
±0.050 ±0.025
Mounting width: ±0.010 ±0.015 ±0.025 0.015 0.015
Dimensions in mounting width W2 or W3 0.003 0.020 0.020
Variation of mounting height dimension H 0.003 0.005 0.007
0.007 0.010
Variation of mounting width dimension W2 or W3✽
Refer to Table 2
Running parallelism of face C against face A
Running parallelism of face D against face B

✽ Difference in roller slides on the reference side roller guide.

Table 2 Running parallelism Ultra super precision Super precision High precision Unit: µm
P3 P4 P5
Rail length Precision
(mm) 2 2 2 P6
2 2 3
Over – 50 or less 2 2 3.5 4.5
50 – 80 2 2 4 5
2 2.5 5 5.5
80 – 125 2 2.5 5 6
125 – 200 2 3 6 7
200 – 250 2 3 6 8
250 – 315 2 3.5 7 9
315 – 400 2 4 8 10
400 – 500 2.5 4.5 9 12
500 – 630 3 5 10 14
630 – 800 4 6 11 16
800 – 1 000 4.5 7 13 17
1 000 – 1 250 5 8 15 19
1 250 – 1 600 6 9.5 17 21
1 600 – 2 000 9 16 23 22
2 000 – 2 500 25
2 500 – 3 000 30
3 150 – 3 500

Fig. 4 Specifications of accuracy

D D
C C

H H

Groove mark A B A B Groove mark
for datum surface Groove mark for datum surface
W 2 KL mark for datum surface W3 KL mark
Mounting width W2
Mounting width W3

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