OnGuard® - Mastiff Series 4.22' Chain Lock with Boxer U-Lock

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Product Details

Mastiff Series 4.22' Chain Lock with Boxer U-Lock (8019LP) by OnGuard®.With slightly smaller, squared links compared to the BEAST chains, the MASTIFF series offers bicycle owners and powersport enthusiasts ultimate security for use in high crime areas. Oversized, titanium reinforced hexagonal links render hacksaws and bolt cutters virtually useless while tight inside link dimensions make prying impossible. Available in a wide variety of chain lengths and link sizes to match your security needs.


Chain Diameter: 0.39"
Chain Finish: Cadmium plated
Chain Length: 51"
Number of Keys Included: 5
Security Lock Type: Chain
Size: 4.22'


  • 5 laser cut keys (1 micro-light and 4 extra grip keys)
  • Micro-light key projects a bright white beam
  • Hexagonal and square links present more hardened surfaces than round links making sawing and cutting virtually impossible
  • Titanium surface hardening vastly increase cut and saw resistance
  • Embroidered nylon chain covers won’t crack or peel for long lasting beauty. n Hook and Loop Fastener tabs keep cover in place to help protect paint and finishes
  • Comprehensive selection of locks types, chain lengths and link size to exactly match security needs
  • Stringent adherence to the highest quality standards
  • Made with maximum safety and reliability in mind
  • Designed and manufactured using innovative technologies

OnGuard® is the number one producer of locks for bicycles, motorcycles, and powersports vehicles. All OnGuard products are categorized based on the security level (ultimate, high, and basic) so that you can choose the lock that suits your needs best. OnGuard products are made with the most durable materials like hardened steel to resist all forms of attack. All locks feature round profiles and smooth edges to eliminate leverage points. They are a real nightmare for any thief, as they are impossible to pull, pick or jack. The company also provides a range of safety services like key-code registration and anti-theft program, as well as a lifetime warranty. OnGuard offers ultimate security solutions powered by the latest technologies and durable construction.

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OnGuard® - Mastiff Series 4.22' Chain Lock with Boxer U-Lock

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