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4 Preload and rigidity
We offer three levels of preload: Slight preload (Z1) and Fine clearance (Z0) for preloaded assembly types, along
with random-matching types of Fine clearance (ZT). Values for preload and rigidity of the preloaded assembly
types are shown in Tables 4 and 5.
Table 4 P reload and rigidity of preloaded assembly of PU series Table 5 Preload and rigidity of preloaded assembly of PE series
Model No. Preload (N) Rigidity (N /μm) Model No. Preload (N) Rigidity (N /μm)
PU05TR Slight preload (Z1) Slight preload (Z1) PE05AR Slight preload (Z1) Slight preload (Z1)
PU07AR PE07TR
PU09TR 0– 3 17 PE09TR 0 – 28 45
PU12TR PE12AR
PU15AL 0– 8 22 PE15AR 0 – 29 46
PU09UR PE09UR
Standard type PU12UR 0 – 10 30 Standard type PE12BR 0 – 37 61
High-load type PU15BL High-load type PE15BR
0 – 17 33 0 – 40 63
0 – 33 45 0 – 49 66
0 – 14 46 0 – 54 86
0 – 25 52 0 – 59 97
0 – 51 75 0 – 75 114
Clearance of fine clearance Z0 is 0-3 μm. Therefore, preload is zero.
Clearance values of the random-matching types are shown in Tables 6 and 7.
Table 6 Clearance of random-matching Table 7 C learance of random-matching
type of PU series Unit: μm type of PE series Unit: μm
Standard type Model No. Fine clearance Standard type Model No. Fine clearance
High-load type ZT High-load type ZT
PU09TR PE09TR
PU12TR 3 or less PE12AR 3 or less
PU15AL PE15AR
PU09UR 5 or less PE09UR 5 or less
PU12UR PE12BR
PU15BL PE15BR
5 Shoulder height of the mounting surface and corner radius r
Figs. 5, 6 and Tables 8, 9 show the shoulder height and corner radius dimensions.
H’ H’ rb rb
ra ra ra ra rb H” rb H”
Fig. 5 Shoulder for the rail datum face Fig. 6 Shoulder for the ball slide datum face
Table 8 Shoulder height of the mounting Table 9 S houlder height of the mounting
surface and corner radius r (PU series) Unit: mm surface and corner radius r (PE series) Unit: mm
Model No. Corner radius (Maximum) Shoulder height Model No. Corner radius (Maximum) Shoulder height
ra rb H’ H”(✽) ra rb H’ H”(✽)
PU05 0.2 0.2 0.7 2.3 PE05 0.2 0.2 1.1 2.5
PU07 0.2 0.3 1.2 2.5 PE07 0.2 0.3 1.7 3
PU09 0.3 0.3 1.9 2.6 PE09 0.3 0.3 3.5 2.8
PU12 0.3 0.3 2.5 3.4 PE12 0.3 0.3 3.5 3.2
PU15 0.3 0.5 3.5 4.4 PE15 0.3 0.5 3.5 4.1
(✽)H ” is the minimum recommended value based on the (✽)H” is the minimum recommended value based on the
dimension T in Table 13. dimension T in Table 14.
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