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OnGuard 8019L Mastiff 6' x 3/8" Quad Chain Lock, Black

4.7 4.7 out of 5 stars 138 ratings

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6' x 3/8""

Purchase options and add-ons

Brand Onguard
Special Feature Keyless
Item Dimensions LxWxH 1.97 x 5.51 x 76.77 inches
Material Alloy Steel, Titanium
Color Black

About this item

  • X4 Quattro Bolt Locking Mechanism
See more product details

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OnGuard 8019L Mastiff 6' x 3/8" Quad Chain Lock, Black
OnGuard 8019L Mastiff 6' x 3/8" Quad Chain Lock, Black
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Price-27% $84.25
List:$115.14
$75.10$69.20$114.95$134.96-41% $110.67
List:$186.95
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Monday, Apr 1
Get it Mar 29 - Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Sturdiness
4.5
5.0
4.5
4.9
Sold By
UTR Nutrition
Amazon.com
Stahlwart
Amazon.com
David's Tools
Amazon.com
lock type
High security lock
Key Lock
U-lock
Key Lock
number of items
1
1
1
1
material
Titanium, Alloy Steel
Titanium, Steel, Nylon
Specially Strong Titanium Steel
Steel
MAXPerformance steel shackle; 3t manganese steel; nylon
Stainless Steel, Alloy Steel
shape
U Shape
Square
Round
Round
Oval
finish type
Painted
Painted
Painted
weight
4.8 kilograms
8 pounds
2.5 kilograms
0.25 pounds
15.25 pounds
10.8 pounds

From the manufacturer

ABOUT US

On the inside, OnGuard locks comes with double and quad-locking mechanisms, bump-resistant cylinders, and hardened steel shackles and chains. On the outside, our locks are fully-coated to protect your bicycle or powersport vehicle from scratches and to shield internal parts from the elements, while the bright color scheme sends a clear warning to thieves: don’t even try! And then there’s the extras: all-tube mounting brackets, five laser cut keys, key-code registration, comprehensive anti-theft programs.

Product Description

Longer 6' 10mm (0.39") titanium reinforced, hardened steel hexagonal link chain for more locking options. Boxer U-lock can also be used alone as a disc lock. Chain Dimensions: 180cm x 10mm(6' x 0.39")Shackle Diameter: 14mm (0.55") Hardened Steel.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Link Text Update English [PDF 30 KB] MSDS Update English [PDF 58 KB]

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OnGuard

OnGuard 8019L Mastiff 6' x 3/8" Quad Chain Lock, Black


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What's in the box

  • ONGUARD 8019L
  • Looking for specific info?

    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    138 global ratings

    Customers say

    Customers like the quality, performance, and size of the bike lock. For example, they mention it's a bulletproof lock and chain, perfect for locking bikes in the back of trucks, and works really well. That said, some complain about the size and weight.

    AI-generated from the text of customer reviews

    32 customers mention29 positive3 negative

    Customers are satisfied with the quality of the lock and chain. They mention it's a super heavy duty lock and a strong cover over the chain. Some say that the chain is very secure and too heavy to carry around. Overall, customers are happy with their purchase and recommend it to others.

    "The 10mm chain is substantial. The padlock size took me aback when I first unwrapped it. The lock mechanism is smooth and easy to use...." Read more

    "This is fantastic and heavy duty...." Read more

    "...TLDR: Heavy lock that will deter thieves. Long enough to chain 2 bikes or 1 bike really well." Read more

    "...with the solid build of this thing, I feel confident it will protect my bike in the city, but I'm not looking forward to lugging it around on my..." Read more

    21 customers mention21 positive0 negative

    Customers are satisfied with the security of the bike lock. They mention that it is a bullet proof lock and chain, perfect for securing bicycles, and is excellent for the city. The U-lock itself is much more secure and durable than it even looks on. Customers also say that the lock isn't finicky and works like it should. Overall, customers are happy with the product's security and recommend it to others.

    "...The lock mechanism is smooth and easy to use. I like that the lock has a rubber coating on the U portion...." Read more

    "...a disc lock on my motorcycle which it does fantastic, but the chain is burly enough that I have complete confidence in it...." Read more

    "This has worked well to secure bicycles to my hitch mounted bike rack as well as at home...." Read more

    "...TLDR: Heavy lock that will deter thieves. Long enough to chain 2 bikes or 1 bike really well." Read more

    7 customers mention7 positive0 negative

    Customers are satisfied with the performance of the powersports vehicle part. They mention that it works well and is a good product.

    "...It is hefty at 8 lbs with the lock. Works well in the month or so that I've had it. It's a bit heavy to wear while riding...." Read more

    "Very good product. Over time outside there is a bit of rust on the black U-pin. Spray WD-40 inside lock." Read more

    "Amazing quality and looks. Works really good" Read more

    "Great chain. Easy to handle . Lock isn't finicky and works like it should. Awesome" Read more

    5 customers mention5 positive0 negative

    Customers are satisfied with the size of the lock. They mention that it is very big and heavy, but it looks huge and intimidating next to other locks.

    "...; the lock has the size and heft to match the chain; this setup is massive and dense...." Read more

    "...This thing just looks huge and intimidating next to other locks. I am betting thieves skip over anything locked up with this bad boy." Read more

    "...I could lock up the frame and wheels at the same time, this is the perfect size to be able to do that...." Read more

    "...The Onguard Mastiff Chain Lock with X4 Padlock is a very big and heavy chain and lock. Built solid and should deter any villain...." Read more

    3 customers mention3 positive0 negative

    Customers like the keys. They say it comes with the master key and additional keys for key chains. Customers also appreciate that they provide 5 keys, which they keep in different places.

    "...Plus, they give you way more keys than expected, so you can have spares everywhere, house, car, work, friends, etc." Read more

    "...I like that they provide 5 keys which i keep in seperate places in case i lose one. The whole thing is very heavy...." Read more

    "Arrived on time, packaged great, came with the master and additional keys for key-chains...." Read more

    30 customers mention7 positive23 negative

    Customers are dissatisfied with the value of the powersports vehicle part. They mention that it's ridiculously heavy, has a scary padlock, and is massive and dense.

    "I was surprised when I received the Amazon box and it was so heavy; I didn't remember ordering anything that would have weighed so much...." Read more

    "...has the size and heft to match the chain; this setup is massive and dense...." Read more

    "Heavy, but the best protection on the market. It works as advertised and I can relax with my bike locked up and out of sight." Read more

    "...Very heavy duty and very heavy, so not suitable for taking along on bike rides." Read more

    Very heavy duty unit
    5 Stars
    Very heavy duty unit
    The lock and chain is very strong and exactly as advertised except the lock had a piece missing when it arrived. Please let me know if thus can be corrected.
    Thank you for your feedback
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    Top reviews from the United States

    Reviewed in the United States on July 23, 2023
    Size: 6' x 3/8""Verified Purchase
    Reviewed in the United States on October 4, 2020
    Size: 6' x 3/8""Verified Purchase
    2 people found this helpful
    Report
    Reviewed in the United States on March 2, 2018
    Size: 6' x 3/8""Verified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on November 28, 2016
    Size: 6' x 3/8""Verified Purchase
    5 people found this helpful
    Report
    Reviewed in the United States on August 15, 2021
    Size: 6' x 3/8""Verified Purchase
    Reviewed in the United States on August 29, 2016
    Size: 6' x 3/8""Verified Purchase
    Reviewed in the United States on November 29, 2018
    Size: 6' x 3/8""Verified Purchase
    4 people found this helpful
    Report
    Reviewed in the United States on July 31, 2022
    Size: 6' x 3/8""Verified Purchase
    2 people found this helpful
    Report

    Top reviews from other countries

    Translate all reviews to English
    Javier RT 71
    5.0 out of 5 stars Excelente
    Reviewed in Mexico on April 15, 2019
    Size: 6' x 3/8""Verified Purchase
    Anonymous
    5.0 out of 5 stars DENIED! Bike Lock Defeats Thief
    Reviewed in Canada on December 12, 2017
    Size: 6' x 3/8""Verified Purchase
    MIGUEL A.
    5.0 out of 5 stars Máxima seguridad
    Reviewed in Mexico on August 27, 2023
    Size: 6' x 3/8""Verified Purchase
    Mitchell
    5.0 out of 5 stars Five Stars
    Reviewed in Canada on October 22, 2017
    Size: 6' x 3/8""Verified Purchase
    Alberto G
    5.0 out of 5 stars Cadena de seguridad
    Reviewed in Mexico on December 14, 2018
    Size: 6' x 3/8""Verified Purchase