OnGuard Mastiff Lock

Mastiff series chain locks provide superior protection for medium/high crime areas and are packed with features

  • Chains made of titanium-reinforced, hardened steel links that resist cutting or prying

  • Chain cover protects paint and finishes, with an embroidered logo that won’t flake or wear off

  • Locking mechanisms secure the lock at multiple points: X4P Quattro Bolt shackles on models with separate shackle; X2P Double Bolt on models with integrated locking heads.

  • Locks use Z-cylinder tumbler mechanism that is bump-proof and resists picking, pulling, or drilling

  • Co-molded crossbar cover protects finishes and all-metal endcaps provide protection against hits and drops

  • Automatic keyway cover helps seal lock internals against the elements

  • 5 laser-cut keys, 1 with micro-LED