Medium Torque Type Ball Spline Compact Model LF-X

The nut is more compact than that of the current Model LF thanks to the new circulating pathways.
The outer diameter of the nut is the same as that of the linear bushing.
The Model LF-XL is suitable for moment loads, torque, and overhung loads that exceed those tolerated by the Model LF-X.
Models LF4X to 6X are made of stainless steel, which has high corrosion resistance.

Spline shaft diameter (mm) : 3,4,5,6,8,10,13,16,20,25,30

Handling Precautions

Types

Highlight feature tags

basic load ratings(kN) : Basic dynamic load rating 0.42 to 20.8 / Basic static load rating 0.48 to 34.0
Spline shaft diameter (mm) : 3,4,5,6,8,10,13,16,20,25,30

Features

Compact Nut Design

The nut is more compact than the previous Model LT/LF thanks to the new circulation structure.

The outer diameter is up to 20% more compact than previous THK products.
This makes it possible to design a more compact machine core.

Unit: mm

Shaft diameter	Outer diameter		Overall length
Shaft diameter	Model LT-X	Model LT	Model LT-X	Model LT
3(3D)	6(7)	-	10	-
4	8	10	12	16
5	10	12	13.6	20
6	12	14	17.6	25
8	15	16	23.8	25
10	19	21	30.8	33
13	23	24	32.4	36
16	28	31	46.4	50
20	32	35	59	63
25	40	42	67	71
30	45	47	75.6	80

High-Speed Performance

The new circulation structure optimizes ball circulation, enabling high-speed operations.

Test result: Runs 10,000 km without abnormalities

High-Speed Durability Test

Item	Description
Model No.	LT20X
Speed	2m/s
Acceleration	49m/s²
Lubricant	Lithium soap-based grease (AFB-LF Grease)
Stroke	650mm
Orientation	Horizontal

Smooth Motion

Sliding resistance fluctuates less than that of the previous Model LT/LF.

Rolling Resistance Test

Item	Description
Model No.	LT16/LT16X
Speed	10mm/s
Lubricant	Lithium soap-based grease (AFB-LF Grease)
Orientation	Horizontal

Option: QZ Lubricator

The QZ Lubricator is a lubricator attached to both ends of the spline nut. The QZ Lubricator feeds the right amount of lubricant to the raceway on the spline shaft. This allows an oil film to be continuously formed between the rolling element and the raceway, and it drastically extends the lubrication maintenance interval.