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Bike Chain Lock 3FT/4FT/5FT Heavy Duty Bike Lock Anti-Theft Bicycle Chain Lock 8mm/10mm Thicker Bicycle Lock Chain Bike Lock with 3 Keys for Bike, Motorcycle

  • Based on 866 reviews
Condition: New
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Availability: 20 left in stock
Fulfilled by Amazon

Arrives Sunday, May 24
Order within 8 hours and 15 minutes
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Color: Black(4FT-8mm)


Features

  • HIGH QUALITY HEAVY DUTY BIKE LOCK: The bike chain lock itself features 8mm/0.32inch square links which are made of high carbon structural steel link which is heat treatment hardening, thus the links will not be too brittle. The thick links have high tenacity for strong cut resistance, and will provide your valuable things with extra protection against bolt cutters.
  • HEAVY-DUTY DEADBOLT & BLADE LOCK CORE: Unlike standard bike locks with spring latches, this lock features a solid metal deadbolt that physically blocks cutting and prying. Inside, it uses a blade lock cylinder (not easy-to-pick pin tumblers) with precision-coded blades that only your unique key can align. Its the same tech used in high-security door locksnow protecting your bike from both angle grinders and lock picks. With the lock dust cover and cooper lock cylinder, no need to worry about blocking
  • HUMANISED DESIGN: This bike chain lock comes with 3 keys, so you'll always have a spare one. It will offer you some peace of mind in case you lose one. The bicycle chain lock comes with a flexible protective cloth sleeve which can protect the bike from scratch.
  • WIDE APPLICATION: This bicycle lock has a wide application which is ideal for bicycle, motorcycle, gates, fences and more. Just use it to freely protect your valuable objects as long as the length of this bike chain lock is suitable for the objects you protected.
  • PORTABLE SIZE: The total length of this chain bike lock is 4FT and the weight of which is 3.93lbs. You can just wrap the heavy duty bike lock on your bike frame or just put it into your backpack to enjoy your beautiful day like never before!

Description

8MM/0.32INCH HGIHG CARBON STRUCTURAL STEEL BIKE CHAIN LOCK BRINGS YOU MORE SAFETY The bicycle lock is made of high quality manganese steel which is heat treatment of high tenacity for strong cut resistance. The flexible protective cloth sleeve of this bike lock will keep your bike from scratching. The whole design of the chain bike lock can prevent it from picking, knocking and bumping. Thick Security Links! The bike chain lock itself features 8mm/0.32inch square links which are made of high carbon structural steel link which is heat treatment hardening, thus the links will not be too brittle. The thick links have high tenacity for strong cut resistance, and will provide your valuable things with extra protection against bolt cutters. 3 Keys for You! This heavy duty bike lock comes with 3 copper keys, so you'll always have a spare one. It will offer you some peace of mind in case you lose one. These 3 keys are specially designed which are difficult to copy and the good quality makes it very smooth to open the bicycle lock, you will never worry about blocking. Bring more safety for you! The lock cylinder of this bike lock chain is made by zinc alloy blade, it will make any thief think twice before trying to steal your bicycle, thus bring more safety to your bikes. Comes with a lock hole dust cover, the bicyle chain lock can resist corrosion from water, dust and dirt. The life of your bicycle u lock will be prolonged.

Brand: INTEKIN


Special Feature: heavy duty bike lock


Lock Type: Key Lock


Item dimensions L x W x H: 7.5 x 6 x 1.8 inches


Material: Alloy Steel, Zinc


Brand Name: INTEKIN


Recommended Uses For Product: Securing bicycles


Included Components: bike lock


Model Number: 328-0812-black


Manufacturer: INTEKIN


Item Type Name: bike lock


Unit Count: 1.0 Count


Additional Features: heavy duty bike lock


Lock Type: Key Lock


Controller Type: Hand Control


Control Method: App


Style Name: heavy duty bike lock


Color: Black(4FT-8mm)


Shape: Square, U Shape


Material Type: Alloy Steel, Zinc


Item Dimensions: 7.5 x 6 x 1.8 inches


Item Weight: 3.9 Pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, May 24

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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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • GREAT LOCK.
Color: Black(3FT-8mm)
BUY IT!!!! Its gonna be better then you think. SOLID !! Nobody is gonna touch this. .Very Happy with purchase.
Reviewed in the United States on June 10, 2025 by Mike D.

  • Good quality
Color: Black(5FT-8mm)
Got this for my electric trike works great . It gives me peace of mind that my trike is safe
Reviewed in the United States on March 31, 2026 by cathy Gates

  • Great lock
Color: Black(3FT-8mm)
Solid, easy to use and strong.
Reviewed in the United States on September 26, 2025 by Eduardo Figueroa

  • Seems pretty heavy duty overall.
Color: Black(4FT-8mm)
Seems pretty heavy duty overall. Purchased the 4' and happy with it so far. Quality seems decent. Delivered on time. Would recommend
Reviewed in the United States on August 14, 2025 by Bob hagar

  • Def
Color: Black(3FT-8mm)
This bike lock feels very sturdy and secure. Easy to use, solid build, and gives me peace of mind when leaving my bike outside. Great quality for the price—definitely recommend 🚲🔒
Reviewed in the United States on March 31, 2026 by Florencia Guevara

  • Cadena forrada con llave para bici
Color: Black(3FT-8mm)
La verdad no he tinido necesidad de usarla alli esta nueva ya que a donde me he movido con mi bici electrica desde casa no queda al descuido. Mas bien la vendere. 🫡
Reviewed in the United States on March 23, 2026 by Victor Hugo Morales Luther

  • Secure, but bulky and heavy
Color: Black(3FT-8mm)
I got this lock after having two consecutive combination locks cut from my bicycle. I neglected to write down the combinations I'd set, and after a long winter, I couldn't remember them! So, I decided to go with a key lock. This is a SOLID lock and chain, but it is heavy and bulky. So, I often have to take a few extra minutes after unlocking it so I can figure out how to wrap it around my seat peg. The block where you insert the key is so large that it will droop down and get in the way of my legs or hang down and bang against the frame if I don't wrap it tightly enough. The chain itself is so bulky that it makes wrapping it a challenge. I don't have any storage on my bike (and don't wear a backpack), so this is the only place I can store it. But for the price, it's a great lock. ... show more
Reviewed in the United States on March 29, 2025 by Bruce B.

  • Love
Color: Black(3FT-8mm)
Love it it works great. Except in the winter the lock freezes up.
Reviewed in the United States on December 8, 2025 by Christy

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