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XB1aシll Sーcルre付wきwボitーhルX1ねSじeals for Machine Tool Applications

■ Ball screw specifications Dustproof performance Reduces particle penetration rate to 1/30

● Structure Standard Shaft diameter 40mm
seal Lead 20mm
The ball screw with X1 seals has a double seal structure combining a
dustproof seal and a grease-retaining seal. It improves both dustproof X1 seal Foreign matter Iron particles mixed into grease
performance and grease retention performance, and it can reduce lubricant applied to the screw shaft.
consumption. Moreover, by optimizing the seal shape, heat generation by Particle size:39 89 m
the seals is reduced.
Rotation speed 100min-1
● Scope of application in NSK Ball Screw series
0 5 10 15 20
Ball screws for high-speed machine tools HMS series, (Nut model : ZFRC) Penetration rate, %
HMD series, (Nut model : EM)
*for specifications other than the above, please contact NSK. Results of particle penetration rate test

● Accuracy grade / Axial play Grease retention performance Reduces grease leakage

Accuracy grade: C3 and C5 grades of JIS standard Axial play: 0 (Offset Grease retention ratio (%)100 X1 seal
preload) 90 Standard seal
*for specifications other than the above, please contact NSK. 80
70 Shaft diameter 40mm
● Cautions regarding design 60 Lead 20mm
50
Cut through the thread screw to the end. 40 Grease AS2
Additional torque by X1 seal is about 15-35 N-cm. 30 Rotation speed 2000min-1
Maximum overall shaft length is 2900 mm. 20
10 500 1 000 1 500
0
0

Number of cycles

Results of grease leakage test

Nut Model ZFRC Nut Model EM

6- X drill thru., Rc1/8 22.5
C bore Y Z (Lube hole)
X1 seals X1 seals
(Both sides) 6- X drill thru., (Both sides)
C bore Y Z

A d A d
Dg6 Dg6

Rc1/8 PCD W
(Lube hole)

PCD W

45 45 BF 45 45 MB F M
G L H L
Unit:mm
Nut dimensions of ball screw with X1 seals
W
Shaft dia. Lead Basic load rating［kN］ Axial rigidity Nut dimensions Bolt holes 102
d l MBD A HXYZ 106
Model No. Dynamic Static K L F G 102
Ca Coa [N/μm] 113
122
ZFRC4010-10 10 52.0 137 1 090 173 151 82 124 47 - 11 17.5 11 106
40 - 22
ZFRC4012-10 12 61.0 155 1 110 197 175 86 128 48 112

ZFRC4508-10 45 8 37.3 118 1 160 146 124 - 22 82 124 47 - 11 17.5 11 118

ZFRC5010-10 10 57.7 175 1 320 174 151 93 135 51 11 17.5 11
50 - 23 -
ZFRC5012-10 12 77.6 214 1 360 200 177 100 146 55 14 20 13

EM4016-4E 40 16 57.1 130 1 020 172 148 6 18 86 128 - 96 11 17.5 11
EM4020-6E 7
20 66.9 165 1 340 164 139

EM4516-4E 45 16 59.6 145 1 060 173 148.5 6.5 18 92 134 - 102 11 17.5 11
EM4520-6E
20 69.1 186 1 470 164 139 7

EM5016-4E 50 16 61.8 160 1 150 173 148.5 6.5 18 98 140 - 107 11 17.5 11
EM5020-6E
20 73.2 206 1 600 164 139 7

Notes: 1. All of the above are right-hand screws. Table 1
2. Value shown as rigidity K is the value when 5% of the basic dynamic load rating Ca has been applied as the preload.
Shaft dia. d Minimum D

◆ X1 seals are also available for some BSS series. ( Table 1 for minimum nut outside diameter.) 40 70
　 Please contact NSK for details. 45 75
50 82

Handling precautions Maximum temperature for use: 60 ºC (measured at outside diameter of ball nut)
Chemicals that must be avoided: Do not leave ball screw in hexane, thinner, or other organic solvents that remove oil,
in white kerosene, or in rust preventive oil that contains white kerosene compounds.

NSK Ltd. has a basic policy not to export any products or technology designated as controlled items
by export-related laws. When exporting the products in this brochure, the laws of the exporting
country must be observed. Specifications are subject to change without notice and without any
obligation on the part of the manufacturer. Every care has been taken to ensure the accuracy of the
data contained in this brochure, but no liability can be accepted for any loss or damage suffered
through errors or omissions. We will gratefully acknowledge any additions or corrections.

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