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Compact FA Series FSS Type for Transfer Equipment

Applications

Transfer equipment for abundant industrial fields such as automobile, semiconductor, food and medical equipment.

Accuracy grade and axial play

Accuracy grade: Ct7 grade of JIS Axial play: 0.010 mm or less

Easy stroke setting

Flexible stroke setting with fixed-simple support by means of mounting support unit (simple support side)
directly onto ball screw thread outside diameter.
Since corner cutting is not necessary, it is easy for customers to cut the screws, which contributes to reduction in cost
and lead time.
If necessary, NSK will accept orders for cutting.

Precautions
During the cutting process, be careful not to let metal particles or burrs fall inside the nuts.
Customers are also advised to treat the cut surface.
When inserting the support unit (simple support side), apply oil or grease on the outside of the shaft and inside the
bearing.

Shaft end support Easy stroke setting by cutting the shaft end and burring.

Fixed side: The low-profile support units
Simple side: especially compatible with
the compact FA PSS type are
available.
Proprietary support units are
available.

Design precautions

Permissible rotational speed varies when using cut screw shaft. It is necessary to calculate two items below, and
whichever smaller is the permissible rotational speed.
• Critical speed which is the resonance vibration of the shaft. (Refer to the technical description of the catalog

"Precision Machine Components".)
• Maximum rotational speed 5 000 min-1

Combinations of shaft diameter, lead and shaft length

Shaft Lead Overall shaft length Page Recommended support unit
dia. 400 500 600 900 1 000 1 450
12 10 Fixed Simple
15 10
20   37 to 38 WBK08-01B WBK12SF-01B
20 10
20   WBK12-01B WBK15SF-01B
25 10    39 to 40
20  
   41 to 42 WBK15-01B WBK20SF-01B

 
   43 to 44
WBK20-01 WBK25SF-01