KUMSAN E&C

KUMSAN E&C
ABOUT US

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.

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

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

PRODUCT

BOALOCK BOLT

The BoaLock bolt is an anti-loosening bolt that uses the rotational elasticity of a coil spring and was developed for use in places where nuts cannot be used.
In other words, this product was developed to use bolts with a loosening prevention function where there is a tab on the floor or a tab on the block.

Create a spring room at the end of the bolt, insert the coil spring for the bolt, make a groove at the upper end of the spring room, place the spring in this groove and fix it so that it cannot move, and the other end is spaced a certain distance away from the locking protrusion made at the end of the bolt. This product is positioned freely without fixing.

BOALOCK NUT

BoaLock is an anti-loosening nut that uses the rotational elastic force of a coil spring.

The BoaLock nut creates a spring room on the thread of a regular nut to place the spring, creates a groove at the upper end of the nut, bends the upper spring end, and inserts it into the groove, and there is a protrusion inside the nut at a certain distance from the end of the lower spring.

Main Products

Company Introduction

∙ 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.