About Us


About our Quality Control


We usually keep an eye out for the inspection of our goods in order to use them without anxiously.

This is to inform you that we are performing multifarious inspections from raw materials to finished goods, preventing inferior products from occurring and only supply satisfactory goods to the market.

The confidence we are receiving from our customers is substantiated by the complete inspection apparatuses mentioned below.

ROCKWELL hardness measuring instrument
Inspect for the hardness of heat treatment.

AMSLAR Strength testing machine
Inspect for torque wrench, etc.

50 ton Hydraulic omnipotent testing machine
Inspect for the breaking load of hydraulic tools and welding parts.

Other inspection apparatus
Skin thickness meter, SHORE hardness measuring instrument, CHARPY Impact testing machine, Projector, etc.






Company overview



Company name KOTO SANGYO Co,. Ltd.

Head office 10-40-2, Harue-cho, Edogawa-ku, TOKYO 132-0003 JAPAN

Established May 1, 1944

Representative Hirotaka Aoki

Employees 60