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Information on the different types and specifications of Support Units for ball screws, including models EK, FK, EF, and FF. It also includes details on the installation process and the recommended shapes of shaft ends for each model. useful for engineers and technicians working with ball screws and related equipment.
Typology: Study notes
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Fixed side Supported side
Bearing
Housing
Snap ring
Bearing
Collar
Housing
Lock nut
Set piece
Hexagonal socket-head setscrew
Holding lid
Seal
Fig.1 Structure of the Support Unit
Structure and Features
Ball Screw Peripherals
Support Unit
Example of Installation
Square Type Round Type
Ball Screw Peripherals
Support Unit
Types of Support Units and Applicable Screw Shaft Outer Diameters
Inner diameter of fi xed-side Support Unit (mm)
Inner diameter of supported- side Support Unit (mm)
Applicable Model No. of fi xed-side Support Unit
Applicable model No. of the sup- ported side Support Unit
Type BNK with Unfi nished Shaft Ends(Applicable Model No.)
Recommended Shapes of Shaft Ends(Applicable Shaft Outer Diameter D)
Shaft End H (mm) Shaft End J (mm)
Note1) The Supports Units in this table apply only to those Ball Screw models with recommended shaft ends shapes H, J and K, indicated on (^) A. Note2) For Recommended Shapes of Shaft Ends H, J, and K; refer to pages A to A.
Model Numbers of Bearings and Characteristic Values
Angular ball bearing on the fi xed side Deep-groove ball bearing on the supported side
Support Unit model No.
Bearing
Axial direction Support Unit model No.
Bearing model No.
Radial direction
Basic dynamic load rating Ca (kN)
Note) Permis- sible load (kN)
Rigidity
(N/m)
Basic dynamic load rating C(kN)
Basic static load rating C 0 (kN)
EK 4 FK 4
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
equivalent (DF P5)
Note) “Permissible load” indicates the static permissible load.
Mounting Procedure
Note1) Do no disassemble the Support Unit. Note2) When inserting the screw shaft to the Support Unit, take care not to let the oil seal lip turn outward. Note3) When securing the set piece with a hexagonal socket-head setscrew, apply an adhesive to the hexagonal socket- head setscrew before tightening it in order to prevent the screw from loosening. If planning to use the product in a harsh environment, it is also necessary to take a measure to prevent other components/parts from loosening. Contact THK for details.
Supported side
Bearing
Snap ring
Fixed side
Collar
Set piece
Hexagonal socket-head setscrew
Lock nut
Base
Fixed side support unit
Table Bracket Supported side support unit
Ball Screw Peripherals
Support Unit
Adjust the nut by moving the table so that the nut Measure the axial clearance travels smoothly throughout the whole stroke. Measure the runout
Note) Make sure the mounting accuracy is maintained.
Motor Coupling
Ball Screw Peripherals
Support Unit
EK Square Type Support Unit on the Fixed Side
2-^ φ d 1 through hole, φ d 2 counter bore depth h
2-^ φ d 1 through hole
Models EK 4 and 5 Models EK 6 and 8
b
h 1
φ d
T
Model No.
Shaft diameter
d L L 1 L 2 L 3 B H b 0. EK 4 4 15 5.5 17.5 3 34 19 17
EK 5 5 16.5 5.5 18.5 3.5 36 21 18
EK 6 6 20 5.5 22 3.5 42 25 21
EK 8 8 23 7 26 4 52 32 26
EK 10 (^10 24 6) 29.5 6 70 43 35
EK 12 (^12 24 6) 29.5 6 70 43 35
EK 15 (^15 25 6 36 5 80 49 )
EK 20 (^20 42 10 50 10 95 58) 47.
Models EK 4 to 8 Part No. Part name No. of units
1 Housing 1 2 Bearing 1 set 3 Set nut 1 4 Collar 2 5 Seal 1 6 Lock Nut 1
7 Hexagonal socket-head setscrew (with a set piece)
BK Square Type Support Unit on the Fixed Side
4-^ φ d 1 through hole, φ d 2 counter bore depth h
T
b
h 1
Model No.
Shaft diameter
d L L 1 L 2 L 3 B H b 0.
h 1 0.
Ball Screw Peripherals
Support Unit
φ d
Unit: mm
Mass
P C 1 C 2 d 1 d 2 h M T Bearing used kg
46 13 6 6.6 10.8 5 M3 16 7000 equivalent (DF P5) 0.
46 13 6 6.6 10.8 1.5 M3 19 7001 equivalent (DF P5) 0.
54 15 6 6.6 11 6.5 M3 22 7002 equivalent (DF P5) 0.
68 19 8 9 14 8.5 M4 24 7203 equivalent (DF P5) 1.
70 19 8 9 14 8.5 M4 30 7004 equivalent (DF P5) 1.
85 22 10 11 17.5 11 M5 35 7205 equivalent (DF P5) 2.
102 23 11 14 20 13 M6 40 7206 equivalent (DF P5) 3.
114 26 12 14 20 13 M8 50 7207 equivalent (DF P5) 4.
130 33 14 18 26 17.5 M8 50 7208 equivalent (DF P5) 6.
Part No. Part name No. of units
1 Housing 1 2 Bearing 1 set 3 Holding lid 1 4 Collar 2 5 Seal 2 6 Lock Nut 1
7 Hexagonal socket-head setscrew (with a set piece)
Ball Screw Peripherals
Support Unit
Mounting method B
φ d
Unit: mm
Installation procedure A
Installation procedure B (^) Bearing used Mass
L 1 T 1 L 2 T 2 d 1 d 2 h M T kg
5.5 3 6.5 4 3.4 6.5 4 M2.6 10 AC4-12(DF P5) 0.
5.5 3.5 7 5 3.4 6.5 4 M2.6 11 AC5-14(DF P5) (^) 0.
Part No. Part name No. of units
1 Housing 1 2 Bearing 1 set 3 Set nut 1 4 Collar 2 5 Seal 1 6 Lock Nut 1
7 Hexagonal socket-head setscrew (with a set piece)
FK Round Type Support Unit on the Fixed Side
Mounting method A
(90° equidistant)
Models FK 10 to 30
4-^ φ d 1 through hole, φ d 2 counter bore depth h
φ Dg6^ φ d PCDφ A
B
T
Model No.
Shaft diameter
d L H F E D A PCD B
FK 10 10 27 10 17 29.5 34 –0. –0.
–0. –0.
–0. –0.
–0. –0.
–0. –0.
–0. –0.
EF Square Type Support Unit on the Supported Side
2-φ d 1 through hole,^ φ d 2 counter bore depth h
Models EF 6 and 8
φ d
b P
h 1
Model No.
Shaft diameter
d L B H b 0.
h 1 0.
Note) The area marked with “*” is imprinted with a numeric character(s) as part of the model number.
Ball Screw Peripherals
Support Unit
Part No. Part name No. of units
1 Housing 1 2 Bearing 1 3 Snap ring 1
2-^ φ d 1 through hole
Models EF 10 to 20
b P
h 1 H 1
φ d
Unit: mm
Bearing used
Snap ring size
Mass
H 1 P d 1 d 2 h kg
20 30 5.5 9.5 11 606ZZ C6 0.
26 38 6.6 11 12 606ZZ C6 0.
24 52 9 — — 608ZZ C8 0.
24 52 9 — — 6000ZZ C10 0.
25 60 9 — — 6002ZZ C15 0.
25 75 11 — — 6204ZZ C20 0.