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Kryptonite Keeper 712 Bike Chain Lock, 4ft Heavy Duty Anti-Theft Lock

  • Based on 2,200 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon

Arrives Tuesday, Oct 13
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Features

  • HEAVY-DUTY ANTI-THEFT PROTECTION: Features 7mm four-sided chain links made from hardened manganese steel, providing strong resistance against cutting and theft attempts for everyday bike security
  • 4 FT FLEXIBLE CHAIN DESIGN: The 120cm (4 ft.) chain length offers versatile locking options, making it easy to secure your bike frame and wheel to bike racks, poles, and other fixed objects
  • HIGH-SECURITY LOCKING SYSTEM: Equipped with a hardened deadbolt locking mechanism and reinforced lock head designed to provide dependable protection in urban and suburban environments
  • DURABLE WEATHER-RESISTANT COVER: A tough nylon sleeve helps protect your bike frame from scratches while shielding the chain from dirt, moisture, and daily wear
  • CONVENIENT & RELIABLE: Includes 2 ergonomic keys and access to Kryptonite's Key Safe Program. Weighing approximately 3.75 lbs (1.70 kg), it delivers an excellent balance of security, durability, and portability for commuters and recreational riders

Description

Keeper 712 Integrated Chain Lock features 7mm four-sided chain links made from 3t manganese steel. Patent-Pending End Link Design secures chain to hardened deadbolt eliminating critical vulnerability and providing extra holding power. High security disc-style cylinder is pick and drill resistant; resists most common hand tools. Durable weather-resistant nylon sleeve prevents scratches to painted finishes and protects the chain against the elements. With a 48-inch (120cm) chain length, the Kryptonite Keeper 712 is a flexible, compact and easy to use deterrent security.

Brand: Kryptonite


Special Feature: Anti-theft


Lock Type: Pin Tumbler


Item dimensions L x W x H: 7.09 x 7.09 x 1.18 inches


Material: Alloy Steel


Brand Name: Kryptonite


Recommended Uses For Product: Cycling, outdoor


Number of Pieces: 1


Included Components: Kryptonite 001706


Model Number:


UPC: 720018001706


Model Name: Kryptonite Keeper 712 Integrated Chain


Global Trade Identification Number: 06


Manufacturer Warranty Description: Manufacturer Warranty


Number of Items: 1


Manufacturer: Kryptonite


Number of Packs: 1


Unit Count: 1 Count


Item Type Name: LOCK


Manufacturer Part Number: 001706


Additional Features: Anti-theft


Lock Type: Pin Tumbler


Controller Type: Hand Control


Control Method: Touch


Style Name: Kryptonite Cadena Antirrobo Keeper 712-7mmx120cm Integrado 32" 001706 Black


Color: Black


Shape: catena


Material Type: Alloy Steel


Finish Types: Painted


Item Dimensions: 7.09 x 7.09 x 1.18 inches


Item Weight: 3.7 pounds


Item Highlight: Weather-resistant, 120cm long, hardened steel 7mm links, 2 keys, 5/10 security rating, for motorcycles, scooters, or gates


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Oct 13

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


  • Great lock, use on e-scooters, heavy but strong
Color: Black Size: 48'
Strong and a deterrent, like it's not combo. Heavy but feel secure using it.
Reviewed in the United States on September 29, 2026 by JayG

  • Secure lock
Color: Black Size: 48'
Its a great lock. Very strong and heavy. I dont think anyone will be cutting through this.
Reviewed in the United States on August 5, 2026 by Lyrickcantrap

  • good strength/quality
Color: Black Size: 48'
excellent chain, heavy duty and everything it described. I would definitely buy again
Reviewed in the United States on September 2, 2026 by Kellie

  • Good Quality, Heavy, Expensive extra 12"
Color: Black Size: 48'
Good quality as expected from Kryptonite, though the price seemed a bit steep i went for it anyway. The 4 ft length might come in handy, so no regrets..... but a few days later i saw the 3ft version at W4LM4RT for 19.99. So that extra foot of chain comes at a $25 extra cost. Consider if you need a 4ft chain, if 3ft will do, save some money. Notable that this chain is HEAVY. Makes sense of course but it's kindof a lot of weight to add to bicycle or ebike ride. Won't matter on a Harley. Due to weight, I decided to stick with a much lighter cable lock for most days. Only going to carry this monster chain where/when the extra security is needed. ... show more
Reviewed in the United States on January 13, 2026 by Tagleford Finnicks VonKrapenstein

  • It's Still There.
Color: Black Size: 48'
While kind of 'pricey' the thought of losing an item that's costly itself & a necessary form of transportation these days was a huge factor in selection of this security device. As the collapse of society seems more evident every day, the thought of some miscreant 'Coming-Up'... was another motivating factor in investing in a good locking device. This lock is a Beast. It is quite heavy, so those concerned about weight may want to reevaluate choices. In this case, weight wasn't so much an issue. Theft deturent WAS. Cable bike locks can easily be cut with simple cheap cable-cutters quickly. This lock? Not so much. Can it be cut? Yup. Quickly & quietly? Nope. Can it be picked? Yup. Quickly? Nope. Good thick high-test chain was only option. Not liking paint or frame damaged by intense rubbing and/or chain banging, a high-quality sheath was highly motivational in this selection. While the weight can be a drawback, another small issue is the lock cylinder can be a bit finicky at times. However this can be sort reassuring in of itself, by being rather difficult for a novice 'picker' lacking proper tools. Appearance was another deciding factor as it looks tough, rugged & matches bike styling. And... in a 'pinch'...it could make a hellva defensive weapon. 'Peace-of-Mind'... Who can put a price on that? When a beloved 'high-value' item has to be left unattended, it's nice to see that it's... "Right where I left it". ... show more
Reviewed in the United States on October 30, 2024 by Douglas Dixon

  • Great lock
Color: Black Size: 48'
Excellent product. I am very happy with it. The chain format is much more convenient than their u-lock which gives you zero flexibility with regards to things you can lock it to. Reviews of every lock by every brand includes angle grinder stories so you really need to just pick one that is functional, not indestructible. ... show more
Reviewed in the United States on September 4, 2026 by JD_in_SB

  • Very heavy but very sturdy
Color: Black Size: 48'
This thing is very heavy, but I’m happy about it because it is super sturdy. I can tell this would be a heck of a job to cut through, and I think most thieves would pass on it when they realized how thick it is.
Reviewed in the United States on September 26, 2026 by Alisha

  • Heavy duty
Color: Black Size: 48'
Very heavy duty. Love that the lock is made out of metal and not plastic. the 4 ft length is great for looping through the frame and tire and then around whatever you are attaching it to.
Reviewed in the United States on June 2, 2026 by Lori

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