Shaft

• As the L.M. slide shafts are used in combination with ball bushes that move in linear motion, the shafts play important roles of guiding the ball bushes as well as the inside wheel bearings. Therefore, the shaft quality significantly influences on the functions of ball bushes and linear motion systems.
  
  
• We, at Myung Sung Shaft, in consideration of these points, guarantee the functions of L.M. shafts that have been enabled from our accumulated technologies and experiences made over the long period of time in its selecting the materials, heat treatment, polishing and machining and so many other processes.
  
  
• We, at Myung Sung Shaft, have maintained the product lines with more than 10 types of shafts that you can select properly according to your applications and use.

Materials

• High-carbon chrome bearing steel (KS:STB-2, JIS:SUS-2)
  
• STB-2 (high-carbon chrome bearing steel)

STB-2, High-carbon chrome bearing steel JIS:SUS-2

Heat treatment(Induction Hardened)

Excellent heat treatment processes activated by removing the residual stress inside the materials by the induction hardening processes, and inspecting the materials relative to the required natures, crack corrosions of the constant structures and others.

Surface hardness

STB-2 : HRC 60-HRC 64
SUS 440C : HRC 58-HRC 62

Photographic pictures of micro-structure

Photographic pictures of hardening layers

Hardness distribution curve Ø20

Axial precision degree

• Less than 0.005mm in case of the length of axis less than 100mm
  
• The following formula applies in case of the length of axis more than 100mm
  
• Linearity = Length of axis/100?.005mm

Method of Spark Test for steels

Photographic pictures of homogeneous hardening layers