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OKG

OKG Heavy Duty Security Chain, 3.9ft x 5/16" Thick Outdoor Gate Chain, Cut Proof Chain Made of Hardened Alloy Steel Chain, Ideal for Fence Gates, Bicycles, Moped, Trailers, Generator, etc

  • Based on 141 reviews
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Availability: In Stock.
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Arrives Wednesday, Jul 29
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Color: Silver


Size: 3.9ft x 5/16" thick


Features

  • UNPARALLELED SECURITY - Protect your valuable possessions with the OKG Security Chain, a cut proof chain and heavy duty chain that offers unmatched security.
  • UNBREAKABLE STRENGTH - Made from case hardened and triple heat-treated HI-TECH alloy steel links, this 3.9ft length chain is uncuttable, ensuring maximum security against attacks from bolt cutters, saws, hammers, and heavy-duty hand tools.
  • ALL-WEATHER DURABILITY - A security gate chain surface plating with eco-friendly white zinc, can effectively prevent oxidation and corrosion rust. Built to withstand outdoor elements, this chain is suitable for use in any weather condition, providing reliable security year-round.
  • CONVENIENT AND PORTABLE - Designed with a convenient carrying handbag package for easy security chain storage and portability, ensuring hassle-free use wherever you go.
  • VERSATILE COMPATIBILITY - Compatible with most high security padlocks or disc locks available on the market, this chain is perfect for securing fences, bicycles, motorcycles, gates, generators, and more.

Description

ENDEAVORING THE FUTURE OF SECURITY NVC08000H Series OKG hardened chain chain is ideal for bikes, mopeds, motorcycles, generators, gates and fences, barbecues and lawnmowers, toolboxes and ladders, hand trucks, scaffolding, barbecues, sports equipment, etc. choose a security chain that suits your security needs. Have you been looking for a security chain that is a virtually uncuttable chain? Looking all over the online store for a chain that's as close to an cut proof gate chain as you can get without breaking? How about a chain and lock set you can rely on to protect your gate fence, bike, motorcycle, generator, electric scooter or anything that can be chained down? HERE IT IS. Includes a zippered nylon storage tote for easy storage and portability. 8mm square chain links made of triple heat-treated hardend MANGANESE STEEL for extreme strength. Narrower inner width of individual links prevents bolt cutters, bolt croppers and leverage attacks. Continuous salt spray test for 168 hours, no corrosion and rust on the surface of the anti theft chain. Tips, refer EN ISO 9227 corrosion tests in artificial atmospheres requirements and test methods. OKG bike lock chain uses anti theft design ease of use with most high security padlocks or Disk lock on the market. OKG Heavy Duty Security chain is made of triple heat-treated special MANGANESE STEEL with a special anti-corrosion coating which makes them ideal for outside use. The links are not round like on common chains, but are square shaped which is a lot more effective against attacks with tools. We hope to bring customers the best product experience and defend personal and industrial property with the best security. Choosing a suitable padlock, U-lock is easy if you follow some guidelines. It is always worth considering the shackle clearance and maximum security you can get with your padlocks, U-locks or anchors. You need a lock with enough shackle clearance to house the thickness of the chain's link. Continuous salt spray test for 168 hours, no corrosion and rust on the surface of the anti theft chain. Security chain heat treatment carburizing and hardening process, refer to EN ISO 2639 standard, surface hardness 63.3 HRC (HV 780), core hardness 49.1 HRC (HV 500), surface carburizing depth 0.2~0.5mm. In order to ensure the quality and safety of OKG lock chain products, our OKG products have passed the Corrosion test, Dust test, Frost Test, Cutting Test, Hardness, and other combined tests. Resistant to all kinds of hand tools attacked by thieves, such as bolt cutters, saws, hammers, chisels, pistol drills, crowbars, etc. CAUTION: When you choose a high-quality professional heavy-duty safety chain, first it must go through a thorough test of strict loads - for example, attack test, corrosion test, dust test, frost test, tensile strength test, torque strength test, cutting test, hardness test. Secondly, the smoothness of the chain welding joint, the consistency of the size of the inner diameter of the chain, the surface plating process, etc. Finally, whether it has been certified by a professional, authoritative testing organization, it is recommended that you make a comprehensive and detailed comparison. OKG specializes in the production of bike locks and security chain accessories. It has a group of professional and advanced production equipment and technical personnel who can provide customers with high-quality security products at reasonable prices.

Brand: OKG


Special Feature: Anti-saw, Anti-rust, Anti-cutting, Anti-Corrosion


Lock Type: Lock Chain


Item dimensions L x W x H: 11.02 x 4.33 x 2.95 inches


Material: 3T Manganese Steel


Brand Name: OKG


Recommended Uses For Product: Ideal for bike, motorcycle, container, scooter, ATVs, generator, fence gate, golf carts, etc.


Number of Pieces: 1


Included Components: Tool Bag, Security Chain


Model Number: NVC08120S


Model Name: NVC08120S


Manufacturer: OKG


Unit Count: 1.0 Count


Manufacturer Part Number: NVC08120S


Additional Features: Anti-saw, Anti-rust, Anti-cutting, Anti-Corrosion


Lock Type: Lock Chain


Control Method: Touch


Style Name: Heavy duty Security Chain


Color: Silver


Shape: Square Chain


Material Type: 3T Manganese Steel


Finish Types: Zinc Plated


Item Dimensions: 11.02 x 4.33 x 2.95 inches


Item Weight: 4 Pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 29

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • So far, so good!
Color: Silver Size: 3.9ft x 5/16" thick
I didn't actually try to cut it, but it does seem sturdy and well made. The length was also perfect for my application. Hopefully it will hold up well in its outdoor location.
Reviewed in the United States on February 19, 2026 by Mr. Applebaum

  • Thieves Aren't Going To Cut This Chain Like They Did With The Last Chain!
Color: Silver Size: 3.9ft x 5/16" thick
Very stout super hard chain. I doubt anyone is going to be able to cut this chain like the last one did. Would be thieves broke into my carport that has a swinging gate. I used a regular chain and lock to keep thieves out, but they brought bolt cutters and were in the process of trying to steal my golf cart while I was away on a trip. Fortunately the cart would not move due to a flat rear tire! I think I'll flatten all four tires before my next trip! But I seriously doubt those thieves will be back. I have a much brighter motion light installed now. I am getting tired of having to nail every thing I own down. The damned thieves try to steal the nails too! When I first got this chain I took it to my shop, set it on an anvil, and tried to ding it with a very sharp chisel and large hammer. Suffice it to say bolt cutters are not going to cut this chain. It is expensive for what you get, but what you get appears to be nearly indestructible! I have a lock that is equally strong, and a very similarly hard eye-bolt anchored to the garage wall. ... show more
Reviewed in the United States on September 25, 2025 by Grant County x-Golfer

  • Beautiful Heavy Duty Security Chain
Color: Silver Size: 3.9ft x 5/16" thick
This is a beautiful heavy duty security chain that is well made and well finished. I think it is a good deterrent! We have it touching stainless steel and it has not scratched it. It has no rough edges.
Reviewed in the United States on July 20, 2026 by Ol' Phill

  • Great chain!
Color: Silver Size: 3.9ft x 5/16" thick
This chain seems really good. I'll have to get me another lock to go with it. I bought a master lock off of Amazon but it was trash so I need a new lock.
Reviewed in the United States on August 15, 2024 by James Lockhart Garrott

  • Thick chain
Color: Silver Size: 3.9ft x 5/16" thick
Thick and sturdy for my front gate.
Reviewed in the United States on December 13, 2025 by Claire Bear

  • Moderate security.
Color: Silver Size: 3.9ft x 5/16" thick
This is a high quality chain and will likely, as claimed by the manufacturer, resist bolt cutters. However, a battery powered abrasive cut-off tool will cut through this and any other chain in seconds (which is the way I cut chain to length) so, ultimately, it would not be sufficient for a high-security situation. That would be true of any similar product. ... show more
Reviewed in the United States on July 3, 2025 by Dav Mar

  • Can't cut
Color: Silver Size: 3.9ft x 5/16" thick
Exactly what we needed. We needed to lock our gate for security and it was important to make sure you could not use bolt cutters to break the chain. We tried ourselves to use bolt cutter & it wouldn't budge. Make sure you also have a lock that cannot be cut by bolt cutters.
Reviewed in the United States on March 9, 2025 by Carin Hawks

  • Heavy duty indeed
Color: Silver Size: 3.9ft x 5/16" thick
I use this on my motorcycle. It's a bit of a hassle with my lock but otherwise it works
Reviewed in the United States on February 9, 2024 by AH

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