Self-locking bolts & nuts

Negotiable Min Order Quantity Unit

Required Quantity
Place of Origin
South Korea
Brand name
Payment Terms
Production method
Shipping / Lead Time
Negotiable / Negotiable
bolt, fastener, nut, self locking,
Bolts , Nuts
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Dae Kwang Metal Co., Ltd.

Country / Year Established
South Korea South Korea / 2004
Business type
Verified Certificate



Product name Self-locking bolts & nuts Certification -
Category Bolts
Ingredients -
Keyword bolt , fastener , nut , self locking Unit Size -
Brand name V-LOCK Bolt, V-LOCK Nut Unit Weigh -
origin South Korea Stock -
Supply type - HS code -

Product Information

▩ What is V-LOCK?

  • V-LOCK is a screw thread system with a perfect anti-loosening function. When fasteners are joined together with a specially threaded fastener, which has the V-LOCK screw thread on one of the bolt and nut, the loosening of bolts and nuts during vibration and impact is prevent.


▩ Principle of V-LOCK

  • The screw thread of V-LOCK consists of two tangeltial parts (the first and second tangential parts) to induce double dontact point locking with the other object with a common screw thread. It maximizes the friction force between the bolt and nut screw threads through double contact points and performs an anti-loosening function.



▩ Technology of V-LOCK    

  • Anti-loosening fuction when it is joined with fastener with a common screw thread (V-LOCK bolt & common nut / V-LOCK nut & common bolt)
  • Passed the maximum vibration test (NASA standard ; NAS 3350)
  • Completed the anti-loosening function test that measures the change in axial force (Junker Test ; DIN 65151)
  • Obtained the world's first DNV·GL classification certification for fasteners
  • Daekwang Metal's patented technology
  • Low unit price (same manufacturing process as the common bolts and nuts excluding the dies, tap and bite the form the V-LOCK screw thead)
  • Wide range of applications (applicable regardless of the shape, material and plating of products)



▩ Effect of V-LOCK    

  • Perfect anti-loosening effect during extreme vibration and impact
  • Modifies the screw thread of the common bolt and nut specification ⇒ Alternative for existing products)
  • Component parts, such as washers, double fastening, coating processes, screw adhesive, and others ar not required. ⇒ Cost reduction due to the single fastening of the bolt and nut
  • Same torque as the fastening and loosening of common bolts and nuts ⇒ Increases work efficiency


▩ Applications 

  • Components which maintenance is difficult
  • Component used under extreme vibration
  • Widely applicable in all industry

▩ Breakaway view 




  • Product Specification : M6 ~ M20(current productive capacity) / M6~M42
  • Material : S45C, SUS, SCM, Plastic(Injection), EP, etc.
  • Plating : Applicable to most plating including hot dip galvanizing
  • Customized products is also suppliable


Product Info Attached File

V-LOCK catalog(compressed).pdf

B2B Trade

Price (FOB) Negotiable transportation -
MOQ Negotiable Leadtime Negotiable
Payment Options Negotiable Shipping time Negotiable

Dae Kwang Metal Co., Ltd.

Country / Year Established
South Korea South Korea / 2004
Business type



Hyeon Woo Seo
Juchon-myeon, Seobu-ro 1499beon-gil,101-68, Gimhae-si, Gyeongsangnam-do, Korea
Product Category
Bolts,Fasteners,Machinery & Parts,Nuts,Vehicles & Accessories
Year Established
No. of Total Employees
Company introduction

1978. 06. Established Daekwnag Bolt

2001. 04. Established Hyundai Special Steel

2002. 01. Established Daekwang Metal

2003. 07. Obtained the ISO 9001:2008 certification

2004. 04. Converted into a corporation, Daekwang Metal Co., Ltd. And moved to larger facilityes

2007. 11. Obtained the ISO/TS 16949:2009 certification

2008. 08. Obtained the certification of a clean workplace

2008. 09. Selected as a Promising Small and Medium Business by Busan Bank

2008. 11. Selcted as an INNO-BIZ company

2010. 11. Selected as a military service company

2011. 03. Established a company-affiliated research institute

2011. 05. Obtained a certificate of venture business

2011. 06. Obtained the certification of components and materials manufacturing

2011. 07. Selected as NEW EXPORTER 300 by the Gyeong-nam Trade Association and became a member of the trade association

2012. 06. Obtained the certification of designation as a promising export firm

2014. 11. Obtained the certification of root industry

2015. 02. Obtained the classification certificate of DNV GL (V-LOCK)

2017. 04. Obtained a certificate of designation as a global IP star company

2017. 11. Obtained a new technology certification from the Korea Expressway Corporation technology market (V-LOCK)

2019. 12. Obtained the certificate of New Excellent Product by Ministry of Trade, Industry and Energy

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Japan Japan

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