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Mitsui Precision Surface Grinders

Precision grinding is a core capability of our Mitsui machines, leading to significant advancements in the manufacture of high-accuracy dies and contributing to global prosperity.

Mitsui High-tec, Inc. designs its machines using state-of-the-art technology and precision engineering. They have a team of experienced engineers who use advanced computer-aided design (CAD) software to create detailed blueprints of the machines.

The machines are then built using high-quality materials and cutting-edge manufacturing techniques, such as CNC machining and robotic welding.

The company also uses advanced testing and quality control methods to ensure that the machines meet or exceed industry standards. This allows them to produce machines that are not only efficient and reliable but also precise and accurate.

Mirror Finishing

The surface grinder from Mitsui has a smooth operating ball guiding system. It is commonly believed that a ball guide system's lack of stiffness makes it unsuitable for mirror finishing. However, the mirror surface produced by our effort to make component parts more rigid and accurate is comparable to that produced by other guiding systems.

More than 1.6 million sets of motor cores for automotive applications are provided annually by Mitsui High-tec, Inc. with high-precision interlock technology that has been developed over a long period of time.


Mitsui's meahanite castings are extremely heavy and reinforced with internal ribs. They feature a 5-point leveling system using jack bolts and plates, and are designed with the Mitsui trademark of easy component removal and replacement for minimal maintenance and downtime cost.


The precision of our Mitsui surface grinders is evident in the top-of-the-line cartridge spindle that can be easily removed. Our grinders also feature a carriage and saddle that moves on two 45-degree V-ways and a table that moves on linear ball bearings, resulting in the repeatability that Mitsui is known for. There are no compromises in the design.


Precision design is essential, but it is also crucial that it can be maintained over time. Mitsui ensures durability by using D-2 hardened and ground steel ways on the table, carriage, saddle, and column for vertical movement. Linear ball bearings also add to the durability of the table and carriage union. The cartridge spindle's lubrication is also sealed for life and protected from dust. The standard automatic lubricating system automatically lubricates all vital components to minimize wear and friction, leaving you one less task to worry about.

Manual Series

Precision grinding has always been a core capability of our Mitsui machines, leading to significant advancements in the manufacture of high-accuracy dies and contributing to global prosperity.

Mitsui Hand Feed Precision Grinder

  • MSG-200M

  • MSG-205M

  • MSG-205M-L
  • MSG-250M
  • MSG-200MH/6-12

  • MSG-205MH/6-18
  • MGS-250MH/8-18


Mitsui Semi-Automatic Precision Grinder

  • MSG-200H1
  • MSG-250H1
  • MSG-250H2EC


Fully Automatic Precision Grinder / High Precision Automatic Surface Grinder


The Mitsui Model Number 250HMD stands out as the only machine in its class that has been successfully manufactured for both large-part grinding and small, tight tolerance work. Its chuck can be stacked for production work, and users will be impressed by the accuracy across the entire surface.

All Available Models

  • MSG-200HMD
  • MSG-HMD Series (250/300/400)
  • MSG-250HG
  • MSG-300/400 Series

Mitsui PC Controlled High Precision Surface Grinder


Both seasoned users and newcomers frequently use the manual grinding option, which is left unchanged. On a Windows PC, Mitsui's original software runs to control MSG-618/818PC-NC. Multiple types of grinding applications are available via flexible software.


This is a modern CNC ultra-high precision surface grinder that Mitsui High-tec created, produced, and continually developed for use in the production of its own ultra-high precision tools and dies. The characteristics are:

  • Exclusive design for CNC to improve rigidity
  • The high stability
  • Hydrostatic Guide for Longitudinal Way
  • Linear Motor Drive System (Longitudinal)
  • Air Bearing Spindle
  • 240 litter Coolant Tank with Temperature Control System


Mitsui Ultra High Precision CNC Surface — punch —Grinder

  • High-speed table movement by linear motor drive
  • Max 200SPM/20mm (3/4”) stroke
  • Accurate table positioning for climb cut
  • Air bearing spindle (optional)

All Available Models

  • MSG-618PC-NC
  • MSG-618CNC
  • MSG-618CNC-HS
  • MSG-818CNC-FA
  • MSG-300CNC+P.C.S
  • MSG-818PC-NCL-R'
  • MSG-525PC-NCL-R'

Profile Grinder


General Information

  • Machine Types

    Conventional, Semi-Automatic, & CNC

  • Models


  • Table Dimensions

    • RT450 = 450x200 mm
    • RT550 = 550x300 mm
    • RT700 = 700x300 mm
    • RT1000 = 1000x300 mm
    • RTL700 = 700x500 mm
    • RTL1000 = 1000x500 mm
    • RVB300 = 400x150 mm
  • Manufacturer

    Mitsui High-tec, Inc.

About Mitsui High-Tec Inc.

logo, Mitsui High-tec, Inc.

Mitsui High-tec, Inc. was founded in 1949 by Yoshiaki Mitsui, who was born in Kumamoto Prefecture in 1921 and passed away in 2008. He was the founder of Mitsui MFG. CO., LTD, which later became Mitsui High-tec, Inc. He was continuously involved in the development of stamping tools and responsible for driving the transition from hand-finished technology to post-heat treatment and full-grinding finishing. He received the Japanese Emperor's Indigo Ribbon in 1984.

The leadership of Mitsui's tenaciously challenging spirit achieved industry paradigm shifts for technology of high precision tungsten carbide tools, IC leadframe stamping tools, MAC system (Mitsui Automatic Core assembly system), and spot electroplating production equipment. Also, aggressive erection of factories overseas contributed to early successes.

In the short span of a single generation, Mitsui High-tec has become a truly global leading-edge technology corporation. The corporate motto is "Roads open up for those who travel a noble path" and the employees are constantly asked, "What is the truth?" This simple spirit embodied by the Corporate Motto guides the corporation.

Why Choose Mitsui?

  • High-quality products

  • Leading-edge technology
  • Corporate Sustainability

Video Gallery — Surface Grinding Machines In Action

Additional Machine Photos

Technical Machine Documentation

General Catalog

Surface Grinders

PC-NC Series

Surface Grinder

618PC-NC, 818PC-NC, 525PC-NC, 300PC-NC

PC­-NC Series

Surface Grinder

818PC­NC, 525PC­NC , 818PC­NCL, 525PC­NCL, 300PC­NCL

MSG Series

Surface Grinder

MSG­-200MH, MSG­205MH, MSG­250M

MSG ECO Series

Surface Grinder