Medium Torque Type Ball Spline
With the medium-torque ball spline, the spline shaft has two to three crests on the circumference, and along both sides of each crest, two rows of balls (four to six rows in total) are arranged to hold the crest so that a reasonable preload is applied.
The rows of balls are held in a special resin cage incorporated inside so that they stay aligned and recirculate. With this design, balls will not fall even if the nut is removed from the spline shaft.
![](https://www.thk.com/jp/assets/images/products/ball_spline_medium_torque_type.png)
Types
Highlight feature tags
- Lightweight
- Compact
- Medium torque type
- Flanged type
- Cylindrical type
- Solid spline shaft
- Hollow spline shaft
![](https://www.thk.com/jp/assets/images/products/medium_torque_type_lt.png)
- Medium torque type
- Cylindrical type
- Solid spline shaft
- Hollow spline shaft
Splineshaftdiameter(mm) : 4,5,6,8,10,13,16,20,25,30,40,50,60,80,100
![](https://www.thk.com/jp/assets/images/products/medium_torque_type_lf.png)
- Medium torque type
- Flanged type
- Solid spline shaft
- Hollow spline shaft
Splineshaftdiameter(mm) : 6,8,10,13,16,20,25,30,40,50
![](https://www.thk.com/jp/assets/images/products/medium_torque_type_lt-x.png)
- Medium torque type
- Compact
- Cylindrical type
- Solid spline shaft
- Hollow spline shaft
Splineshaftdiameter(mm) : 3,4,5,6,8,10,13,16,20,25,30
![](https://www.thk.com/jp/assets/images/products/medium_torque_type_lf-x.png)
- Medium torque type
- Compact
- Flanged type
- Solid spline shaft
- Hollow spline shaft
Splineshaftdiameter(mm) : 3,4,5,6,8,10,13,16,20,25,30
![](https://www.thk.com/jp/assets/images/products/medium_torque_type_lfk-x.png)
- Lightweight
- Medium torque type
- Compact
- Flanged type
- Solid spline shaft
- Hollow spline shaft
Splineshaftdiameter(mm) : 5,6,8,10,13,16,20,25,30
![](https://www.thk.com/jp/assets/images/products/medium_torque_type_lfh-x.png)
- Lightweight
- Medium torque type
- Compact
- Flanged type
- Solid spline shaft
- Hollow spline shaft
Splineshaftdiameter(mm) : 5,6,8,10,13,16,20,25,30
Features
Structure and Features
![](https://www.thk.com/jp/assets/images/products/ball_spline_medium_torque_type_en_img_f11.jpg)
With the medium torque type Ball Spline, the spline shaft has two to three crests on the circumference, and along both sides of each crest, two rows of balls (four or six rows in total) are arranged to hold the crest so that a reasonable preload is applied.
The rows of balls are held in a special resin retainer incorporated in the spline nut so that they smoothly roll and circulate. With this design, balls will not fall even if the nut is removed from the spline shaft.
Large Load Capacity
The raceways are formed into circular-arc grooves approximate to the ball curvature and ensure angular contact. Thus, this model has a large load capacity in the radial and torque directions.
No Angular Backlash
Two rows of balls facing one another hold a crest, formed on the circumference of the spline nut, at a contact angle of 20° to provide a preload in an angular contact structure. This eliminates an angular backlash in the rotational direction and increases the rigidity.
High Rigidity
Since the contact angle is large and an appropriate preload is given, high rigidity against torque and moment is achieved.
Ball Retaining Type
Use of a retainer prevents the balls from falling even if the spline shaft is pulled out of the spline nut.(except for models LT4 and 5)
Types of Spline Shafts
Precision Solid Spline Shaft (Standard Type)
![](https://www.thk.com/jp/assets/images/products/ball_spline_medium_torque_type_en_img_f07.jpg)
Special Spline Shaft
![](https://www.thk.com/jp/assets/images/products/ball_spline_medium_torque_type_en_img_f08.jpg)
Hollow Spline Shaft (Type K)
![](https://www.thk.com/jp/assets/images/products/ball_spline_medium_torque_type_en_img_f09.jpg)
Hollow Spline Shaft (Type N)
![](https://www.thk.com/jp/assets/images/products/ball_spline_medium_torque_type_en_img_f10.jpg)
Housing Inner-diameter Tolerance
When fitting the spline nut to the housing, transition fit is normally recommended. If the accuracy of the Ball Spline does not need to be very high, clearance fitting is also acceptable.
Housing Inner-diameter Tolerance |
General conditions |
H7 |
---|---|---|
When clearance needs to be small |
J6 |