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Selection of ball screws

Three types of compact FA Series are available. Choose optimal types for
application.

NSK Standard Ball Screws

Compact FA PSS Type for general uses Page 3,
7 to 30
Accuracy grade: C5 grade of JIS
Axial play: shaft dia. 6 and 8 mm; 0.005 mm or less

shaft dia. 10 mm or over; 0

Compact FA USS Type for high-accuracy and clean Page 4,
environments
31 to 36
Accuracy grade: C3 grade of JIS Axial play: 0

Compact FA FSS type for transfer equipment Page 5,
37 to 44
Accuracy grade: Ct7 grade of JIS Axial play: 0.010 mm or less

Combinations of screw shaft diameter and lead Unit: mm

Lead 5 8 10 12 15 20 25 30 40 50 60

Screw
shaft dia.

6 

8 

10  
12 
15    
20 
25    

    

    

PSS type USS type FSS type

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