[INQ. NO. 2505M08] Hana Gigun Co., Ltd. is a company that develops and sells its Hana Lock washers & nuts that prevent bolts/nuts from loosening.
Hana Gigun operates its own corporate research institute and has excellent technical skills in product design and new-product development through the utilization of professional research personnel. In addition, the company is a promising venture company that directly performs product sales and inventory management by recruiting experts in each field.
Bolts and nuts are basic components used in all fields such as machinery, equipment, construction, and structures.
The stress caused by the pulsation of oil and gas flowing inside the pipe due to the vibration of the motor or pump lowers the bonding strength of bolts and nuts and causes the leak phenomenon, which not only damages expensive equipment but also causes great economic losses. It also can lead to leakage of chemicals and hazardous materials, resulting in fatal accidents.
Safe anti-loosening bolts and nuts are thus needed in all fields, and many domestic and foreign companies have been suggesting solutions with various methods and products for a long time, but the reality is that before Hana Gigun they had not been clearly resolved.

Hana Lock washers & nuts, excellent for preventing safety accidents
Hana Lock washers & nuts limit safety accidents by preventing loosening of bolts and nuts due to vibration or external force. They can be applied to all fields where bolts and nuts are used ― such as machinery, equipment, piping facilities, steel structures, oil refining, chemicals, gas, ships, railways, bridges, etc.
Hana Lock washer’s stamping method and Hana Lock nut’s retainer method have a double loosening-prevention function, ensuring they have excellent loosening prevention effect even at low torque values (30~50Nm). They are products that have passed the authorized certification agency’s vibration test, Korea Testing & Research Institute (KTR)’s NAS3350.
It is easy for anyone to use with its easy fastening/disassembly method. They have superior quality and reliable loosening-prevention functions compared to imported products, and are available at low unit prices as a domestic patented product.
With their reliable anti-loosening effect, they not only shorten the construction period but also reduce labor and maintenance costs.
Hana Gigun has completed numerous overseas patent registrations (USA, China, Germany, Japan) and overseas design registrations (USA, Europe, China), thereby effectively responding to overseas demands.

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