Sigtuna Heavy Duty Anti-Theft U Lock - 18mm Shackle, Bicycle & E-Bike Lock with Sturdy Mounting Bracket for Scooter, Motorcycle & Outdoor Equipments
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Availability:
In Stock.
Arrives
Wednesday, Oct 29
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Color: Black
Size: Medium - Diameter(18mm)
Features
- Heavy Duty Anti-Theft: Sigtuna Anti-Theft Bike U Lock is Made of 18mm High-Strength Special Steel.
- High Security: Lock Cylinder Applied High-Security Cylinder and Double Deadbolt Locking Mechanism.
- Easy to Use: This Bike Lock Comes with an Install Mount, Protective Coating to Protect Bikes Paint.
- Widely Used: Sigtuna Bike Lock suit with Bicycles, Electric Bikes, Scotters, Motorcycles, and More.
- 100% Service Guarantee: Any problem we sincerely hope you can contact us to get the best solution.
Brand: SIGTUNA
Special Feature: Anti-theft, Cut Resistant
Lock Type: u lock
Item dimensions L x W x H: 9.8 x 6.2 x 1.2 inches
Material: High-Strength Special Steel
Brand: SIGTUNA
Special Feature: Anti-theft, Cut Resistant
Lock Type: u lock
Item dimensions L x W x H: 9.8 x 6.2 x 1.2 inches
Material: High-Strength Special Steel
Recommended Uses For Product: securing bicycles, e-bikes, scooters, motorcycles, and outdoor equipment
Style: Simple
Color: Black
Number of Pieces: 1
Included Components: lock, mounting bracket, keys
Controller Type: Hand Control
Shape: U Shape
Control Method: Touch
UPC: 850055349056
Model Name: u lock
Manufacturer: SIGTUNA
Part Number: BL3
Item Weight: 2.35 pounds
Product Dimensions: 9.8 x 6.2 x 1.2 inches
Item model number: BL3
Size: Medium - Diameter(18mm)
Item Package Quantity: 1
Special Features: Anti-theft, Cut Resistant
Batteries Included?: No
Batteries Required?: No
Date First Available: December 12, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Oct 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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Color: Yellow
Size: Long
I wanted to upgrade my bike lock (actually, one of my bike locks - I use two U-locks in the city) to one that was thicker and - more important - has dual locking mechanisms so that two cuts would be required to remove the lock. The Sigatuna is a bit thicker, and has the dual locking mechanism (there seems to be some controversy as to whether its really 16mm or whether that is padded by the plastic coat on the steel - I don't know the answer). I thought the reviews here were encouraging so ordered it. I've been quite happy with it for the 1 month I've had it. Its a bit heavier than my other U-lock (Krypto-Lok) but definitely not "too heavy". And I suspect its much better security. The key has been easy to turn - something that was a problem with the other Master U lock I had that this replaced. I don't use the frame mounting bracket so can't comment on that - I have a rat-trap carrier and I keep it in that secured with a bungee cord. And I actually don't use the cable - and I think its generally a bad idea because all of them are easily cut. I have found that a much more convenient and secure way is to have two U locks. So I have this as my "heavy duty" lock, and a Krypto-Lok as my secondary one (and which fits through the perforations on my helmet allowing that to be securely locked to the bike). A second U lock is so much more convenient to carry than a cumbersome cable. I have the Kryptonite lock mounted to the frame, and keep the Sigatuna lock in the rat-trap carrier. It doesn't offer theft protection insurance - but that doesn't bother me. (1) My bike isn't worth that much - less than the deductible! Well, its wort a lot to me, but not money. (2) Somehow I suspect that the fine print on all those bike lock insurance plans are smarter than most bicyclists - and I rather doubt they really ever pay.
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Reviewed in the United States on December 2, 2018 by Ron
Color: Black
Size: Medium - Diameter(18mm)
Great and easy to use bike lock for easy security for your b8ke when riding doing errands. If using for outside your apartment overnight would recommend also with a chain lock just for extra protection and ease of mind for the security of your bike.
Reviewed in the United States on June 27, 2025 by michael
Perfect, very strong and resistant, excellent security
Reviewed in the United States on July 22, 2025 by Henry D Alonso
Color: Yellow
Size: Long
I recently moved into a new apartment building known for having some bikes stolen, so I decided to invest in a solid lock to deter thieves as much as possible. This one does the job, and then some. The cable is long enough to wrap through both wheels, and the lock is extremely thick and solid, so I have no qualms about leaving my bike locked up. Some pros and cons: PROS: -The cable and lock are both extremely sturdy -The lock is very easy to unlock, and there are even two keys so you have an extra if you misplace one. -The lock twists to hide the keyhole out of sight which is a nice feature -I really appreciate being able to store the lock and cable on my bike when I'm on the move instead of lugging it in a backpack CONS: -This isn't really a con, but more of an annoyance: the cable IS long enough to wrap through both wheels, but I had a little trouble doing this with the way my apartment's bike rack is set up. Again, that's more me than the cable itself and it really is plenty long. -I had a bit of trouble securing the storage bracket to my bike. It kept slipping down on the frame, but I was finally able to tighten it enough and haven't had an issue since. Really, five stars here and no complaints. Great lock for a great price.
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Reviewed in the United States on August 12, 2017 by Journo27
Color: Yellow
Size: Long
My requirement is to get a lock under $30. After browsing through several options, shortlisted 2 finally. 1. SIGTUNA Bike locks - 16mm U Lock with Steel Chain Cable 2. Kryptonite Kryptolok Series-2 Mini-7 with Steel Chain Cable Initially I thought I would go with Kryptolok as its sleek to fit it in the bike. But after trying out both, I decided to go with SIGTUNA itself. - Though SIGTUNA is bulkier than Kryptolok, in terms of both lock head and the shackle, it didn't look that bulkier when you put on the bike. Also heavier it is, more safer it is! - SIGTUNA is wider than Kryptolok, which helps to lock the wheel with the frame and the pole easily and comfortably. - SIGTUNA locks on both the side of the shackle (Double Deadbolt locking), while the Kryptolok has a bent foot design on one end. My understanding is, it requires to cut on both the sides to release the lock, while on Kryptolok its enough to cut on one side and the shackle releases automatically on the bent foot side. However, few small issues / concerns.. - The mounting system is made of plastic. I'm not sure how long it will hold the lock. Also, it is not sturdy and wobbles a lot when you mount the lock. - The mounting system cannot be mounted on the horizontal bar of my bike, as it had a cable on the bottom for the read breaks. - The lock is not that smooth. Sometimes it gets stuck and need to retry couple of times. - The Key Hole Cover is not that great. Feels like cheap plastic. - May be the lock head could have been less bulkier for the 16mm shackles. SIGTUNA Vs Kryptolok - Steel Shackle: 16mm vs 13mm - Weight: 3.75 lbs vs 2.75 lbs - Number of Keys: 3 vs 2 - Cable Length: Both are 120 cm (4 ft) PS: Amazon prize might be different for Kryptolok. Found in REI for $25. Shortly, I would not complain the lock for the money! Definitely would go for it and recommend the same.
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Reviewed in the United States on April 26, 2019 by Baskaran Baskaran