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 8019LP Bike Chain U-Lock 130cm x 10mm

The Mastiff 8019LP features a 4.22' 10mm hexagonal link chain length which saves weight whilst the clever cinch-loop design adds locking versatility. Short shackle Boxer U-lock with X4P Quattro Bolt locking mechanism eliminates pry points for superior protection. 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: 130cm x 10mm.
  • Shackle diameter: 14mm hardened steel.
  • OnGuard Security Rating: 90/100.
  • Sold Secure rating: Gold.
  • X4P Quattro Bolt Locking Mechanism locks shackle on four sides.
  • 10mm titanium enforced hexagonal hardened steel chain.
  • Cinch loop design requires less chain for effective lock up.
  • Water and heat resistant embroidered chain cover with velcro closures.
  • 1Z-Cylinder is bump-proof and resists picking, pulling or drilling.
  • Rounded design and centered keyway eliminates pry points.
  • Co-molded crossbar cover and double rubber coated shackle protects finishes.
  • All-metal end caps provide additional protection against hits and drops.
  • Automatic keyway covers helps seal lock internals against the elements.
  • Includes 5 laser cut keys, 1 with micro LED.
  • Weight 3.6kg (inc keys).