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Product guide

OnGuard 8019 Mastiff 10mm Chain Lock, 3.5 ft

OnGuard 8019 Mastiff is a chain lock listed with 10 mm links and a 3.5-foot chain, paired with a Boxer U-lock according to the feature text. Its chain cover is described as helping protect painted surfaces and allowing compact coiling.

At a glance

  • The feature text identifies a 3.5-foot chain with 10 mm hexagonal steel links, presented as resistant to saws and cutters.
  • A sleeve over the crossbar and cylinder is claimed to add protection, while the cylinder is described as designed to resist physical attack and picking.
  • The chain cover is described as water- and heat-resistant, protective of painted surfaces and suitable for compact coiling. A rotating dust cover is also listed.
Price
$98.75Save 20%

Reference price: $123.44

Price checked: Nov 13, 2026

View offer

Pros and cons

Pros

  • The stated 3.5-foot chain length and compact-coiling cover may suit buyers needing a chain that can be stored in a smaller space.
  • The listing describes a covered chain intended to reduce scratching of painted surfaces.

Technical specifications

12 specifications
Identity
BrandOnGuard
Model8019
Lock details
Lock typeChain Lock
Listed form factorU Shape
Material listedTitanium Alloy Steel
FinishPowder Coated
ColourBlack/Yellow
Pieces1
Dimensions and weight
Dimensions listed106.7 x 1 x 1 centimetres
Weight listed916 g
Connectivity and controls
Wireless connection listedWi-Fi
Control method listedTouch

What to know before buying

Listing details to confirm

Listing details are contradictory or inconsistent: the title and feature text describe a chain lock with a Boxer U-lock, while the included-components field names a U Lock and the details also list Wi-Fi, Touch controls and a U-shaped form factor. Confirm the selected listing’s lock configuration and relevant dimensions before buying. The 10 mm link size and 3.5-foot length come from the feature text, while the dimensions table gives 106.7 x 1 x 1 centimetres. The listed material wording is also unusual and does not establish a specific alloy composition.

What’s in the box

Included
  • U Lock

Who is it for?

A good fit for

  • Cyclists or powersports users wanting a chain lock with a stated 3.5-foot reach and protective covering.
  • Buyers who want the listing’s claimed combination of chain and U-lock, after confirming the selected package.

Less suited to

  • Buyers who need a confirmed lock configuration or package without checking the listing’s conflicting lock descriptions.
  • Anyone prioritizing minimal carry weight, as the listed weight is 916 g and customer feedback is mixed about weight.

Customer reviews on Amazon

4.5 / 5 · 478 ratings
  • 5 stars76%76%
  • 4 stars12%12%
  • 3 stars4%4%
  • 2 stars2%2%
  • 1 star6%6%

Customer feedback describes the lock as sturdy and functional, with positive comments about durability and ease of use. Some customers raise concerns about key accessibility, while opinions on weight and value are mixed. For buyers considering this listed 916 g lock, those reports make carrying burden and access to the key worth weighing alongside the stated chain length. Aggregate ratings lean positive but do not establish performance for a particular use.

Positive themes

  • Feedback describes the lock as sturdy and functional.
  • Customer feedback is positive about durability and ease of use.

Negative themes

  • Feedback includes concerns about key accessibility.

Mixed feedback

  • Customer opinions are mixed about weight and value for money.

Frequently asked questions

What chain length does the listing describe?

The title and feature text give a length of 3.5 feet. The dimensions field separately lists 106.7 x 1 x 1 centimetres, so confirm the intended dimensions if fit or reach is critical.

Does this package include a U-lock?

The feature text claims a Boxer U-lock and the included-components field says U Lock, but the product details are inconsistent. Check the selected listing to confirm what is supplied.

What do customers report about using this lock?

The supplied feedback describes the lock as sturdy and functional, while noting concern about key accessibility and mixed views on weight and value.

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