The OnGuard Mastiff 4.9 ft Chain Lock combines extended reach with dependable heavy-duty protection for bicycles, e-bikes, scooters, and outdoor equipment. The 150 cm (4.92 ft) chain uses titanium-reinforced hardened-steel square links engineered to resist cutting, sawing, and leverage attacks in demanding environments. Its integrated lock head features OnGuard’s X2P Dual Lock Down mechanism, securing both sides of the shackle for enhanced resistance against pulling and twisting. A double rubber-coated lock body helps absorb impacts and protect finishes, while a durable protective sleeve helps prevent scratches and shields the chain from corrosion and weather exposure. An automatic keyway cover helps keep dust and moisture out of the cylinder for reliable long-term operation. Includes five precision laser-cut keys.

• X2P Dual Lock Security: Integrated lock head secures both sides of the shackle to resist pulling, twisting, and prying attacks.
• Titanium-Reinforced Chain Strength: 150 cm (4.92 ft) hardened-steel square-link chain engineered for superior resistance to cutting and leverage attempts.
• Extended Heavy-Duty Coverage: Longer chain length allows flexible locking to racks, poles, or fixed structures for bikes and e-bikes.
• Protective Weather-Resistant Sleeve: Durable cover helps prevent scratches and protects the chain from corrosion and outdoor wear.
• Complete Key Set Included: Comes with five precision laser-cut keys.


Manufacturer Sku: 8118
Todson Sku: 45008118