Introduction to ball splines/TBI ball spline

Introduction to ball splines

The ball spline is a bearing that can provide smooth and unrestricted linear motion. The ball spline is made up of steel balls in the inner cavity of the spline mother (sleeve) that roll back and forth on the groove of the spline shaft to achieve linear motion. Precision orientable linear transmission components.


Ball splines are transmission parts commonly used in ZR axis motion on high-precision precision instruments. Its main function is to synchronize precise positioning rotation with linear motion. It is a light-load linear transmission component with high precision, high speed and low friction. , small finished product size, widely used in various high-inspiration automatic equipment and devices with high reliability requirements, such as semiconductor packaging, mounting equipment, medical equipment, etc.



Ball spline construction

Ball splines use balls installed in the spline sleeve (female) to circulate in precision-ground grooves on the spline shaft, while performing smooth linear rolling and transmitting torque. Ball splines and spline shafts are designed and processed with different numbers of grooves and different angles as contact points.


The spline mother is composed of six parts: the main bearing steel cavity, balls, plastic turning channels, dust covers, key pins, and screws. The cavity is made into different numbers of ball paths depending on the size, usually 2 or 4 rows. , 6 columns, the more the number, the better the accuracy.


Spline shaft: It is a high straightness optical axis that processes different mathematical grooves according to the corresponding number of spline mother steel ball rows. The higher the straightness and roundness, the higher the accuracy.


Different processing as above can achieve different torques and precisions. In addition to being highly sensitive, it also greatly increases the load capacity. It is suitable for environments that require high positioning accuracy and high-speed motion performance. In such environments where vibration and impact loads are too large It can also play an effective role. At the same time, when used to replace linear ball bushings, the rated load of ball splines is more than ten times that of linear bushings when the shaft diameter is the same, so the design can become very compact. It is safe to use and has high durability even under cantilever loads, moments, etc.


Ball spline classification

  1. Shape classification: straight ball spline, flange ball spline, slider type ball spline


  1. Integrated distinction: integrated ball spline, rotating nut ball spline


  1. Shaft diameter distinction: micro ball splines (light load and torque), large shaft diameter ball splines (medium and high load and torque)


  1. Stroke distinction: unlimited stroke ball spline, limited stroke ball spline


Areswin Precision Machinery Company can provide TBI ball spline. There are SLT ball splines and SLF ball splines all can supply.

Please check here for more information Ball Spline SLF Series/ flange design Ball Spline-ARESWIN (

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About Areswin

The Areswin Company manufactures and markets linear motion,ball screw,ball spline,bearings,nut bracket of ball screw,motor bracket,support unit of ball screw,coupling, and axis industria robot. focus on retail and wholesale the world well-known brands, including STAF,GTEN,HIWIN,TBI, PMI, ABBA (Taiwan), and NSK, THK, NTN, NACHI(Japan), and FAG, INA(Germany), TIMKEN,(USA) and SMC, SAMICK (South Korea), SKF(Sweden) and LMA(China).

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