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Selecting lead･Selecting a shaft diameter

Combinations of Shaft Diameter and Lead for the Precision Ball Screw

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Table 18 shows combinations of shaft diameters and leads of precision ball screws, and Table 19 shows combinations of shaft diameters and leads of precision ball screws compliant with ISO standards.
If a ball screw not covered by the table is required, contact THK.

Table18 Combinations of Screw Shaft Diameter and Lead (Precision Ball Screw)
Unit: mm
Screw
shaft
outer
diameter		 Lead
1 1.5 2 2.5 3 4 5 6 8 10 12 15 16 20 24 25 30 32 35 36 40 42 50 60 80 90 100
4 ●
5 ●
6 ● ● ● ●
8 ● ● ● ● ● ● ● ● ●
10 ● ● ● ● ● ● ● ● ● ●
12 ● ● ● ● ● ● ● ● ●
13 ●
14 ● ● ● ●
15 ● ● ● ● ●
16 ● ● ● ●
18 ● ●
20 ● ● ● ● ● ● ● ● ● ●
25 ● ● ● ● ● ● ● ● ●
28 ● ● ●
30 ● ●
31 ● ● ● ● ●
32 ● ● ● ● ● ● ● ● ●
36 ● ● ● ● ● ●
38 ● ● ● ● ● ● ● ●
40 ● ● ● ● ● ● ● ● ● ●
45 ● ● ● ● ● ● ●
50 ● ● ● ● ● ● ● ● ● ●
55 ● ● ● ● ● ●
63 ● ● ● ● ● ● ● ● ● ● ●
70 ● ● ●
80 ● ● ● ● ● ● ● ●
100 ● ● ● ● ●
120 ● ● ●
140 ● ● ●
Table 19: Standard Combinations of Outer Diameters and Leads of the Screw Shafts (ISO Standard-Compliant Ball Screws)
Unit: mm
Shaft diameter Lead
5 10 20
16 ● — —
20 ● — —
25 ● ● —
32 ● ● —
40 ○ ● ○1
50 — ○ ○1
63 — ○ ○1

●: Ground shaft, CES shaft ○: Ground shaft only
1Model EBB-V (no preload) only

Combinations of Shaft Diameter and Lead for the Rolled Ball Screw

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Table 20 shows the combinations of shaft diameter and lead for the rolled ball screw.

Table 20 Combinations of Screw Shaft Diameter and Lead (Rolled Ball Screw)
Unit: mm
Screw shaft
outer diameter		 Lead
1 2 4 5 6 8 10 12 16 20 24 25 30 32 36 40 50 60 80 100
6 ●
8 ● ● ● ●
10 ● ● ● ●
12 ● ●
14 ● ● ●
15 ● ● ●
16 ● ●
18 ●
20 ● ● ● ●
25 ● ● ● ●
28 ● ●
30 ●
32 ● ●
36 ● ● ● ●
40 ● ● ●
45 ●
50 ● ● ●

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