KUMSAN E&C

Company Profile

∙ Company Overview
Our company was established to create alternative demand for reliability, stability, high efficiency, and high value-added creation in all industries through the groundbreaking discovery and invention of anti-loosening nuts among Bolt and Nut fastener, the basic materials of major industries such as automobiles, electronics, construction, machinery, and aerospace etc.


∙ Our Policy
We focus on commercializing eco-friendly products while focusing our technology to meet 100% of our customers' needs and meet the needs of the market.
We protect human life from safety accidents by BoaLock anti-loosening nuts and bolts.

Company History

March, 2024 Boalock nut registered in the Small and Medium Business Technology Market (Certification of Technology Registration Confirmation)
April, 2023 BoaLock nut registered in the Korea Expressway Corporation technology market
April, 2022 Dawonsys Co., Ltd. Expands supply of Boalock for 210-space vehicle assembly to Seoul Transportation Corporation Line 4 (Gimcheon Factory)
September, 2021 Patent registration for bolt combined with anti-loosening spring
August, 2021 Dawonsys Co., Ltd. begins supplying BoaLock for EMU-150 vehicle assembly (Jeongeup Factory)
May, 2021 Korea Expressway Corporation, Osan-Icheon Expressway Section 1 Section 3 Tunnel Installation of vibration-resistant anti-loosening nuts for fixing wire trays
January, 2017 Named Brand as 'BOA LOCK'
April, 2017 US patent registration
January, 2017 Named Brand as 'BOA LOCK'
December, 2017 Started supplying BoaLock RU to Samsung Heavy Industries LNG gas carrier
June, 2016 Acquired KS lock nut Chinese design registration
January, 2013 KS lock nut EZ, RU patent acquired
November, 2011 Comprehensive acquisition of lock nut business rights from Powerex Corporation
September, 2010 Started supplying lock nuts for KTX in addition to the Metropolitan Railway vehicle maintenance center
September, 2009 Supplied lock nuts for Uijeongbu Light Railway
December, 1995 Establised Kumsan E&C

Factory / Branch Office

Kumsan E&C (Republic of Korea) 555 Dunchon-daero Jungwon-gu ,Seongnam-si ,Gyeonggi-do
Main Products 볼트, 너트

KUMSAN E&C (www.kslocknut.com)

  • The person in charge

    Hanbaek Cho

  • Telephone

    82-23361871

  • Fax

    82-23361873

  • Address

    555 Dunchon-daero Jungwon-gu, Seongnam-si, Gyeonggi-do (13215)
Business Type Manufacturer
Main Product Boa lock nut
Established 1994-12-05
Total Annual Revenue 1~2 billion (KRW)
Total Employees 5~10 people