Kito Seiki Seisakusho Co., Ltd
Most recent update: 2026-05-02
Machines that create precision products. The parts themselves are the micro world. Kito Seiki Seisakusho meets the needs of the most important parts in high-precision, highly difficult parts processing, such as prototype parts with ultra-high variety and extremely low production volume, machine tool parts, and aerospace parts.
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Our strengths
■National Skills Certification
To fulfill the high needs of our clients, all of our staff are continually sharpening their knowledge and abilities with the goal of achieving National abilities Certification Grade 1.
Currently, our craftsmen holding various certifications.
■Repair of rotary tools (milling units)
Our company has been creating rotary tools for many years, with a peak output of 2,000 units per year. In 2016, we established a "rotary tool repair service business" based on our strong technological skills. Our repair service's most notable characteristic is its ability to fix all manufacturers' items with the same accuracy as new ones. As of March 2024, we have fixed over 6,000 devices.
In addition, starting in 2024, we offer spindle unit repair services.
Advantages of rotating tool repair are significant cost savings (up to 80%), restore accuracy to match newer products and help achieve SDGs.
■Cutting Technology
Please leave round items with high accuracy and are difficult to produce like spindles and shafts to us. We have developed and supplied several spindles and shafts that are essential in vehicles, machine tools, industrial machinery etc. We can produce crankshafts with 0.002 mm roundness & concentricity, 0.8S surface roughness, control shafts with 0.5 mm thin-walled polished parts on one side, and eccentric shafts with shifted central axis. We are also capable of shaping such as gear cutting, splines, thread cutting, and key grooves.
Processing examples include spindles for machine tools, crankshafts for automotive products, and shafts for industrial machines.
■Internal grinding
This method involves grinding the inside diameter of cylindrical parts. It can handle a range of Φ6mm to Φ260mm. It also enables internal grinding at any taper angle, even 30°. *Depending on size.
High-precision internal grinding technique delivers roundness, coaxiality, cylindricity, and runout accuracy from the center of 0.001mm and up.
Surface roughness Ra.0.1μm and up.
■Cylindrical grinding
This process involves grinding the outside diameter of cylindrical parts. We can handle diameters ranging from Φ2mm to Φ350mm. We can handle any taper angles, even the 30° angle. *Depending on size
We can grind shafts as long as 1000mm. The dimensional tolerance of 1000mm is ±0.002mm. We also have a CNC cylindrical grinding equipment for mass manufacturing, which can handle everything from single items to large quantities. Geometric tolerances for roundness, coaxiality, runout accuracy and end face squareness are 0.001mm and up, surface roughness Ra is 0.1μm and up.
■Flatness grinding
Flatness, parallelism, squareness, and other features can be modified starting at 0.001 mm.
We can process sizes ranging from 10mm x 10mm to about 400mm x 800mm.
We have a track record of obtaining a symmetry degree of 0.005 when polishing the groove forms of round products, as well as flatness and parallelism with 0.01 mm accuracy when grinding extremely thin plates of stainless steel SUS304 (t=0.8 mm).
■Integrated Production System
We handle each process including processing, polishing, surface treatment, assembling, and inspection.
Our integrated production system solves the concerns of stable quality, short delivery times, and cost saving.
We have a network of over 100 partner manufacturers that support us for particular processes, surface treatments, heat treatments, etc.
■Quality Assurance System
In accordance with customer requests, we attach measurement data from a coordinate measuring machine when delivering products. We can also give comparable assistance with various measurement devices, such as roundness, form, and surface roughness gauges.
We can fulfill client demands by advance preparation measuring spots and methods.
(Contact information)
Kito Seiki Seisakusho Co., Ltd.
Sales Management Department: Naruse
Assembly Division (rotary tool repair related): Nakamura
TEL +81-565-52-3757 FAX +81-565-52-8567
URL http://www.kitouseiki.co.jp
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Electric Vehicle Bus Specifications
Cylinder
Rotor
Bore Diameter Tolerance: 0.008, Roundness: 0.002
Aluminum Alloy Processing
Pure Aluminum (A1060, A1100, etc.)
AL-CU Series (A2011, A2014, A2017, etc.)
Al-Mn Series (A3003, A3105, etc.)
Al-Si Series (A4032, etc.)
Al-Mg Series (A5052, A5056, etc.)
Al-Mg-Si Series (A6061, A6063, etc.)
Al-Zn-Mg Series (A7075, A7050, etc.)
Prototyping and Processing of Automotive Parts
We specialize in prototyping and processing components such as compressors, pumps, fuel cell parts, and inverters. We are capable of handling various materials through methods such as cutting, sand casting, and die casting.
Our processing capabilities often require the integration of NC lathe processing and M/C processing. We ensure all specified dimensions on drawings are measured and guaranteed using precision measurement equipment, including 3D measuring devices, shape measuring devices, 3D image measuring devices, and roundness meters.
We also produce simple jigs internally, contributing to shorter lead times and competitive pricing.
Our certified technicians ensure precision processing at every stage.
‣Lead Time: 1-4 weeks
‣Quality Assurance: Inspection data provided as per customer requirements
‣Pricing: Competitive pricing with high quality (Consultation needed)
Aircraft Valve Components
‣Titanium Alloy
‣Inconel
‣Engine Parts (Internal Combustion)
‣5-Axis Machining
‣High Precision
‣Components for the Ministry of Defense, Internal Combustion Engines, Inconel, 5-Axis Machining, Precision Machining, Difficult-to-Machine Materials
‣5-Axis Machining, Coaxiality, Perpendicularity, Within 2 Microns, 3D Measurement
Aircraft Parts
We excel in precision machining of challenging materials like titanium, Inconel, alloy aluminum, and alloy stainless steel. Our expertise is especially strong in parts related to internal combustion engines and exhaust systems. We accommodate prototypes, small batch production, and very small quantity orders.
We can manage various components such as internal and external splines, special threads, gears, gear cutting, broaching, gear grinding, and thread grinding. We ensure precision using 3D measurement, image processing measurement, shape measurement, roundness measurement, and surface roughness measurement tools.
‣Lead Time: 2-5 weeks
‣Pricing: Contact us for a quote
‣Confidentiality: Your project's confidentiality is assured.
‣Product Name: Cylinder Case
‣Quantity: Production available from 1 to 100 units
‣Material: FCD450
‣Product Dimensions: 119 x 150 x 172.5 mm
The inner diameter is finished with an 80μm thick hard chrome plating, followed by grinding. Ductile cast iron is widely used in automotive parts and water pipes due to its excellent tensile strength, elongation, and toughness.
Processes:
‣Lathe Machining
‣Machining
‣Grinding
‣Gear Cutting
‣Hard Chrome Plating
‣Ductile Cast Iron
‣Spheroidal Graphite Iron
‣Nodular Cast Iron
Kito Seiki Manufacturing Co., Ltd.
http://www.kitouseiki.co.jp/
High-Precision Machining Equipment:
We are equipped with lathe machining (composite lathes, multi-tasking machines), machining centers (5-axis machines, 4-axis machines), external grinding, and internal grinding (guaranteeing 1μ accuracy), enabling us to handle complex and high-precision machining.
We process materials including special steels, special alloys, aluminum alloys, stainless steel alloys, copper, titanium, Inconel, and resins.
High-Precision Quality Assurance System:
We have established a robust quality assurance system certified by ISO9001. Our inspection equipment includes two 3D measuring machines, contour measuring devices, roundness meters, hardness testers, sound level meters, and thermometers, ensuring microscopic precision.
We also stock a wide range of thread gauges, including metric threads, trapezoidal threads, and inch threads.
Short Lead Time Response:
By utilizing IT for thorough lead time management, we meet our customers' demands for short lead times.
‣Product Name: Piston
‣Quantity: Production available from 1 to 100 units
‣Material: S45C
‣Product Dimensions: φ132 x 123 mm
‣Process: Stress Relief → Lathe Machining → Machining → High-Frequency Quenching → Grinding → Lathe Machining → Grinding
‣Geometric Tolerance: Coaxiality 0.01
This piston is a component for machine tools (cylindrical grinders).
Due to significant dimensional displacement on the outer diameter caused by high-frequency quenching, stress relief is performed on the pipe material. Despite being thin-walled, it is fully ground to achieve a coaxiality of 0.01.
Kito Seiki Manufacturing Co., Ltd.
http://www.kitouseiki.co.jp/
High-Precision Machining Equipment:
We are equipped with lathe machining (composite lathes, multi-tasking machines), machining centers (5-axis machines, 4-axis machines), external grinding, and internal grinding (guaranteeing 1μ accuracy), enabling us to handle complex and high-precision machining.
We process materials including special steels, special alloys, aluminum alloys, stainless steel alloys, copper, titanium, Inconel, and resins.
High-Precision Quality Assurance System:
We have established a robust quality assurance system certified by ISO9001. Our inspection equipment includes two 3D measuring machines, contour measuring devices, roundness meters, hardness testers, sound level meters, and thermometers, ensuring microscopic precision.
We also stock a wide range of thread gauges, including metric threads, trapezoidal threads, and inch threads.
Short Lead Time Response:
By utilizing IT for thorough lead time management, we meet our customers' demands for short lead times.
Crankshafts (forged)
Medium lot: Annual production of 500-2000 pieces
We are capable of working with a wide variety of crankshafts, eccentric shafts, eccentric axes, eccentric holes, etc.
We can meet customer-required tolerances for eccentricity by manufacturing our own jigs.
Normally, it is 0.05.
We have a track record of 0.002 in precision machining.
(Processing process)
Material → NC lathe → M/C → Carburizing and hardening → External diameter grinding → External diameter grinding eccentric part (jig processing) → Lapping → Inspection (3D measurement)
(Crankshafts and eccentric shafts)
We specialize in machining eccentric shafts.
We manufacture shafts for a wide range of fields, including vacuum pumps, compressors, vehicles, machine tools, specialized equipment, specialized machines, agricultural machinery, construction machinery, etc.
We can handle high-precision eccentric machining using NC lathes, M/C, and external diameter grinding.
‣ Eccentricity: up to 0.002
‣ Outer diameter tolerance: up to 0.002
‣ Diagonal oil holes available
‣ Journal polishing available
‣ Heat treatment available: high-frequency hardening, carburizing, vacuum hardening, nitriding, tufftride, etc.
(Automotive parts prototype processing)
We are particularly accepting orders for prototype processing of compressors, pumps, fuel cell parts, inverters, etc.
We can handle all materials, including cutting, sand molds, and die casting.
We process a wide range of items that require both NC lathe and M/C processing.
We measure and guarantee all specified points on the drawing dimensions using precision measuring devices such as 3D measuring instruments, shape measuring instruments, 3D image measuring instruments, and roundness meters.
We also manufacture jigs and other tools in-house, which contributes to short delivery times and low prices.
Our top-tier professionals can accomplish precise machining in any procedure.
‣Lead Time: 1-4 weeks
‣Quality Assurance: Inspection data provided as per customer requirements
‣Pricing: Competitive pricing with high quality (Consultation needed)
This is the main spindle of the milling unit for compound lathes. The material is SCM415H. After hardening, the outer diameter and inner taper (8° ER specification) parts are finished by grinding. The runout accuracy of the standalone spindle is within 2μm, measured at the taper part.
- Inner diameter grinding, outer diameter grinding, ultra-precision grinding
- Geometric tolerance assurance, concentricity, cylindricity, parallelism, roundness
- Taper grinding
- Inner diameter grinding, outer diameter grinding, precision grinding, grinding processing
High-Precision Spindles, High-Precision Shafts, High-Precision Axles
With decades of experience, we handle the main spindles and spindles of machine tools, dedicated machines, machining centers, and lathes. Processing proceeds considering heat treatment distortion. We also handle inner diameter taper grinding and outer diameter taper grinding, as well as inner diameter grinding processing after assembly.
- Rotation speed: 2000–50000 RPM
- Runout accuracy: aimed at zero, meeting drawing and customer requirements
- Outer diameter tolerance: 0.001
- Inner diameter tolerance: 0.001
- Coaxiality: 0.001
- Roundness: 0.001
- Symmetry: 0.002
Geometric Accuracy Assurance of Machine Parts
We specialize in precision opening part processing. Using machining processes such as NC lathes, M/C, and outer diameter grinding, we achieve high-precision machining of machine parts. We also handle defect inspection and painting of castings.
- Hole pitch: guaranteed 0.002 or more
- Circle pitch: guaranteed 0.002 or more
- Outer diameter tolerance: up to 0.001
- Inner diameter tolerance: up to 0.001
- Perpendicularity: 0.005 (M/C processing), 0.001 (grinding processing)
- Coaxiality: 0.001
- Surface roughness: up to 0.1z
- Can handle diagonal oil holes
- Heat treatment support: induction hardening, carburizing, vacuum hardening, nitriding, Tufftride, etc.
First-class technicians can achieve precision machining in all processes.
- Lead time: 1W–4W
- Quality assurance: inspection data submitted according to customer requirements
- Price: low cost with high quality (consultation required each time)
Contact Information:
Kitou Seiki Manufacturing Co., Ltd.
Assembly Group: Nakamura
TEL: 0565-52-3757 FAX: 0565-52-8567 Email: nakamura@kitouseiki.onmicrosoft.com
Rotating Tool Repair
At our company, we provide repair services for rotating tools (milling units).
We disassemble the rotating tools entrusted to us by our customers, as shown in the photos. After disassembly, we clean the parts, check for any damage, and diagnose whether repairs are feasible.
Stable operation of machinery and equipment is crucial for maintenance. Therefore, avoiding productivity-lowering troubles is essential.
While purchasing new tools can cost hundreds of thousands to millions of yen, repairing them can reduce costs by up to 80%. We also guarantee the same precision as new products.
Before deciding to replace your tools, please consult with us.
Kitou Seiki Manufacturing Co., Ltd. - Rotating Tool Repair Division
We repair tools with rotating mechanisms used in composite machining machines (such as NC composite lathes and turning centers).
Rotating tools (milling units) attached to composite lathes and used for machining can lose their original precision due to oil stains, rust from coolant, and bearing wear over long periods of use, affecting machining accuracy.
Even rotating tools that have lost their machining accuracy can be restored to like-new precision through cleaning and parts replacement.
At Kitou Seiki Manufacturing Co., Ltd., we have a team of specialized repair staff committed to providing "affordable, fast, and precise" repairs for your rotating tools. Before discarding rotating tools that have lost their machining accuracy, please contact Kitou Seiki Manufacturing Co., Ltd.
Kitou Seiki Manufacturing Co., Ltd.
Rotating Tool Repair Division
TEL: 0565-52-3757
This is the main body of the milling unit (milling unit, cutter holder). The material is made from high-tensile S50C. After grinding the reference surface, the bearing insertion part is finished with a 5-axis machining center. We provide integrated services from material procurement, processing, unit assembly, to rotational testing and data assurance through 3D measurements.
5-axis machining, coaxiality, perpendicularity within 2 microns, 3D measurement.
Processing Steps:
- Material → M/C → NC lathe → Outer diameter grinding → M/C (4-axis or 5-axis) → 3D measurement (21 degrees)
Processing Precision:
- Perpendicularity of the main spindle to the axial direction: within 0.002
- Coaxiality of the left and right sides of the axis: within 0.002
Design and Manufacturing of Rotating Tool Units:
We design and manufacture rotating tool units based on your requirements, product information, and turret space information. We accept orders for special and custom items that cannot be handled by manufacturers.
- Double-ended rotating tools, 2-axis rotating tools, 3-axis rotating tools, universal support, inclined support, etc.
- High precision type, high-speed rotation type
- Lead time: 2.0M~3.5M, Price: Please inquire.
### Rotating Tool Unit Repair Business:
End-users often use expensive rotating tool units until they break without realizing their deterioration. To assist with regular maintenance, we have launched the "Rotating Tool Repair Business Division."
1. Significant cost advantage compared to new purchases.
2. Extends the lifespan of rotating tools.
3. Quick repair and overhaul.
4. High precision guaranteed through verification of dynamic accuracy, static accuracy, and geometric accuracy.
5. Reduced product defect rates due to high precision.
6. Prevention of economic losses from sudden failures.
Contact Information:
Kitou Seiki Manufacturing Co., Ltd.
Assembly Group: Nakamura
TEL: 0565-52-3757 FAX: 0565-52-8567 Email: nakamura@kitouseiki.onmicrosoft.com
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5-face/5-axis machining（ Development and production of prototype/Small-scale production / NC machining ） |
|---|
| Company name | Kito Seiki Seisakusho Co., Ltd | Website URL | https://www.kitouseiki.co.jp/ |
|---|---|---|---|
| Street address |
Toyota City Aichi Japan
[See map] |
Person in charge | Hiroyuki+Watanabe |
| Telephone number | +81-565-52-3757 | Fax number | +81-565-52-8567 |
| Capital | 20,000,000 JPY | Employees | 50 |
| Annual sales | Unregister | EMIDAS Member Number | 83448 |
| Type of manufacturing | Jigs and tools / Machine tools / Transportation equipment | ||
| Main 3 products |
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| Large | Medium | Small |
|---|---|---|
| Designing | Product and part designing | Measurement/testing device designing |
| Designing | Jig and tool designing | General jig designing Welding jig designing Mass production jig designing General-purpose jig designing |
| Development and production of prototype/Small-scale production | Machining | General-purpose lathe machining Deep hole drilling Gear hobber Rolling Thread-cutting Machining/Handles small-scale production (order from 1 piece) Iron Stainless steel Aluminum alloy Copper alloy Magnesium alloy Titanium alloy Nickel alloy Molybdenum alloy Ceramic Machining (resin) Broaching Keyway milling Simultaneous 5-axis machining Milling (resin) Lathe machining (resin) Casting Honing Titanium |
| Development and production of prototype/Small-scale production | NC machining | Machining (vertical) NC lathe machining 5-face/5-axis machining Combined lathe machining Machining (horizontal) Handles 2.5-dimensional processing Handles 3D processing |
| Development and production of prototype/Small-scale production | Electrical discharge machine | Wire electric discharge machining Electric discharge machining |
| Development and production of prototype/Small-scale production | Sheet-metal processing | Pipe machining Can manufacturing Precision sheet metal machining Sheet metal protocol manufacturing Angle machining Coating 3D pipe machining |
| Development and production of prototype/Small-scale production | Blank cutting | Turret punch press processing Cutting Laser and turret punch press processing Laser processing (longer than 121.2 m) Shearing (longer than 121.2 m) CO2 laser machining Laser marking Thin plate (below 6 mm) Thick plate (over 6 mm) Stainless steel Copper/Aluminum Acrylic Precision cutting 3D laser machining |
| Development and production of prototype/Small-scale production | Grinding processing | NC cylindrical grinding Plane grinding Cylindrical grinding Profile grinding Jig grinding Internal grinding Centerless grinding Thread grinding Gear grinding NC internal grinding |
| Development and production of prototype/Small-scale production | Welding/Adhesive bonding | CO2 welding Spot welding TIG welding (argon welding) Plasma welding Arc welding Brazing Friction welding YAG laser machining |
| Development and production of prototype/Small-scale production | Jig manufacturing | General jig manufacturing Welding jig manufacturing Jig and tool manufacturing |
| Development and production of prototype/Small-scale production | Prototype processing | Welding Small-size prototype manufacturing Aluminum die-casting |
| Mass production | Metal press | Bending Blanking Iron Stainless steel Aluminum Thickness Combined press-joining |
| Mass production | Rubber | Rubber product prototype manufacturing Compression molding Blanking Silicon rubber Urethane rubber Packing-related products |
| Mass production | Forging | Hot forging Cold forging Iron Aluminum Brass 500 g - 5 kg Over 5 kg Free forging |
| Mass production | Casting | Lost-wax Sand casting Cast-iron Ductile cast iron Cast steel Aluminum alloy 500 g and below Over 500 g and less than 5 kg 5 kg and over |
| Surface treatment | Plating/Chemical conversion treatment | Nickel (barrel) Zinc (barrel) Chromate (general) Nickel (rack) Gold/Silver plating Chromium (rack) Zinc (rack) Alumite (anode oxidation) Nickel chromium (rack) Electroless nickel (barrel) Electroless nickel (rack) Trivalent Chromate (barrel plating) Iron Copper Aluminum Stainless steel Hard chromium (rack) Black oxide finish Colored alumite Hard alumite Unichromate (white) |
| Surface treatment | Coating | Epoxy coating Heat-resistant coating Metal coating |
| Surface treatment | Polishing/Lapping | Electropolishing Tool polishing Blade polishing Buffing |
| Surface treatment | Lap polishing | Lap polishing |
| Surface treatment | Heat treatment | Normalizing Vacuum normalizing Annealing Full annealing Stress relief annealing (SR treatment) Straightening annealing Vacuum annealing Quenching Salt bath quenching Vacuum quenching High frequency quenching Sub-zero treatment Carburized quenching Salt bath soft nitriding (tufftriding) Nitridation Gas nitrocarburizing |
| Surface treatment | Barrel polishing | Barrel finishing (vibration) Barrel finishing (rotation) Barrel finishing (centrifugal) |
| Surface treatment | Other surface treatment | Other physical vapor deposition methods (PVD) CVD (chemical vapor deposition) Coating Spraying Teflon coating Buffing Shot blast |
| Assembly/Inspection | Assembly | Precision equipment assembly Auto parts assembly Industrial machinery assembly |
| Assembly/Inspection | Repair | Precision equipment repair Industrial machinery repair |
| Assembly/Inspection | Inspection | Rubber Measuring |
| Parts manufacturing | Machinery part | Gear manufacturing Valve manufacturing Bearing manufacturing Vacuum components manufacturing Crank shaft manufacturing Shaft and roller manufacturing |
| Parts manufacturing | Spring | Compression coil spring Leaf spring Torsion spring Carbon steel Stainless steel Copper alloy Diameter Diameter |
| Parts manufacturing | Bolt/Screw/Nut | Screw manufacturing Bolt manufacturing Nut manufacturing Screw manufacturing |
| Product manufacturing | Production property | Machine tool manufacturing Other industrial machinery manufacturing Energy-saving equipment/Automatic instrument manufacturing Carrier machine manufacturing Packaging machinery manufacturing Measurement/testing devices manufacturing Vacuum equipment manufacturing Food industry machinery manufacturing Industrial robot manufacturing |
| Product manufacturing | Construction and civil engineering machinery manufacturing | Civil engineering machinery manufacturing |
