(주)동아

Through continuous reform and challenges, we will always show you the best products

First bolt factory

This factory started production of high tension bolts for friction joint for the first time in Korea in 1961 and expanded to Changwon Bolt Plant in 1991 via Bupyeong High School to establish factory automation with more state-of-the-art facilities.

Torque control bolts were developed in 1993 in Korea, held several briefing sessions, and field test sessions. Through this, today's quality is certified and applied at many construction sites.

60 years of accumulated technology

Due to its accumulated technology and know-how over 60 years, it has been designated as a heat treatment certification plant by world-renowned brand company Komatsu and has been supplying it exclusively in Korea, and exports to the United States, Japan, and Southeast Asia are also increasing.

DONGAH certifies ISO/KS/JIS/EN and produces the best bolts and nuts in Korea with the best quality in order to repay customers with better quality.

leap forward as a Leap

DONGAH will provide the best service to customers with its own and advanced technology in heavy equipment parts, ROLL and ship engine parts, material heat treatment for bolts, bridge and steel structure construction, and track bolts for heavy equipment fastening.

Business items

High tension division

High-tensile Part
Heavy machinery division

Heavy equipment Part
Industrial division

Industrial Part
Heat treatment division

Heat treatment Part

A company that is loved and recognized by customers for its technological prowess that is always one step ahead to create value for customers!

value creation, technology-oriented, customer satisfaction

Based on the constant challenge and pioneering spirit, we will create and lead new corporate values in the coming future, and establish ourselves as a company that stands at the center of the predicted future.

We will pursue customer satisfaction through technology research and development and quality guarantee activities, and external competitiveness through continuous quality improvement activities.

First, we will create value with customers by thinking about them and running a company centered on customer trust and service.

Based on the constant challenge and pioneering spirit, we will create and lead new corporate values in the coming future, and establish ourselves as a company that stands at the center of the predicted future.
We will pursue customer satisfaction through technology research and development and quality guarantee activities, and secure internal and external competitiveness through continuous quality improvement activities.
First, we will create value with customers by thinking about them and running a company centered on customer trust and service.