OnGuard Secure Products

OnGuard bicycle, motorcycle, and powersports locks offer optimal security with the latest technological innovations, quality construction, and ease-of-use all at a great price. You'll enjoy all that the premium brands offer at a significant savings, giving you more for less. Great for commuters, students, and families, OnGuard delivers the meanest locks at the nicest price.

Onguard Mastiff 8019 Bike Chain Lock 110cm x 10mm

Introducing the Mastiff 8019, a short-shackle Boxer U-lock with X4P Quattro Bolt locking mechanism paired to a 3.5-foot long, 10mm titanium reinforced, hardened steel hexagonal link chain. 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 wont crack or peel for long lasting beauty. Velcro 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.


  • Chain dimensions: 110cm x 10mm.
  • Shackle diameter: 14mm hardened steel.
  • OnGuard Security Rating: 90/100.
  • Sold Secure rating: Gold.
  • Automatic keyway cover, weatherproofs the lock meachanism.
  • 10mm (0.39") titanium reinforced, hardened steel hexagon link chain resists cutting or prying.
  • Chain cover protects paint and finishes, embroided logo wont wear off.
  • Bump proof Z-cylinder resistant to picking, pulling and drilling.
  • Includes 5 laser cut keys, 1 with in built micro LED.
  • Anti-theft guarantee of £2000.
  • Weight 3.14kg (inc keys).