GR/GD series
Screw shaft diameter Φ 5 ~ Φ 125, Accuracy grade C0~C10
Customized ground ball screws of single nut type, integral nut type and double nut type using tube method (GR series) and deflector method (GD series) with a range of small diameter (Φ5) to large diameter (Φ125) are available.
Moreover, those of JIS C0 to C10 grade accuracy can be manufactured.

Availability of Customized Ball Screw Range
The range of screw shafts that can be manufactured to meet each accuracy grade of customized ground ball screws is shown below:
When the slenderness ratio (shaft length per shaft diameter) is large, it is sometimes difficult to manufacture a ball screw with the desired accuracy.
The following table shows the maximum length of screw shafts of each accuracy grade that can be manufactured in the standard process. When ball screws exceeding the manufacturable range are required, contact KURODA.




Manufacturable range of screw shaft length
Unit : mm)
 
Accuracy Grade
Screw Shaft Diameter
C0
C1
C2
C3
C4
C5
C7
C10
Φ5
90
120
120
140
140
140
Φ6
160
180
180
210
210
210
Φ8
240
280
280
340
340
340
340
Φ10
340
400
400
480
480
500
500
Φ12
420
500
500
600
600
700
700
Φ15
500
600
600
700
800
1500
1500
1500
Φ16
500
600
600
700
800
1500
1500
1500
Φ20
800
900
1100
1400
1400
2000
2000
2000
Φ25
1100
1300
1600
1800
1800
2000
2300
2300
Φ28
1200
1500
1800
2000
2000
2200
2600
2600
Φ32
1600
1800
2200
2500
2500
2800
3200
3600
Φ36
1800
2000
2500
2800
2800
3100
3600
4000
Φ40
2000
2200
2800
3200
3200
3600
4600
4600
Φ45
2000
2300
3000
3600
3600
4100
5000
5200
Φ50
2000
2800
3600
4000
4000
4500
5500
5500
Φ55
2000
3000
4000
5000
5000
5500
5500
5500
Φ63
2000
3000
4500
5200
5200
5500
5500
5500
Φ70
3000
4500
5500
5500
5500
5500
5500
Φ80
3000
4500
5500
5500
5500
5500
5500
Φ100
3000
4500
5500
5500
5500
5500
5500
Φ125
3000
4500
5500
5500
5500
5500
5500
When the lead is larger than the screw shaft diameter, the manufacturable accuracy grade is C2~C10.
 
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