Description
🔒 OnGuard Mastiff Chain Lock 8019 – Sold Secure Gold Bicycle Security
The OnGuard Mastiff Chain Lock 8019 is a high-security, Sold Secure Gold rated bicycle lock, designed for riders who refuse to compromise when protecting high-value bicycles, e-bikes, motorbikes, and scooters.
This premium security system combines two proven theft-deterrent technologies:
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A short-shackle OnGuard Boxer U-Lock
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A titanium-reinforced hardened steel hexagonal chain
Together, they deliver exceptional resistance to cutting, leverage, prying, picking, and drilling attacks, making the Mastiff 8019 one of the strongest chain lock systems in the OnGuard range.
🛡️ Sold Secure Gold Rated – What That Means
The OnGuard Mastiff 8019 is Sold Secure Gold approved for bicycles, a certification awarded only to locks that withstand prolonged, aggressive attacks using specialist tools.
✔️ Independently tested
✔️ Approved by insurers
✔️ Ideal for high-risk urban areas
✔️ Recommended for expensive bikes and e-bikes
Sold Secure Gold is widely recognised by:
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UK insurers
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Police crime-prevention schemes
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Local authority cycle security programmes
If security ratings matter to you — this one delivers.
🔐 Key Features & Specifications
🔒 Boxer U-Lock
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14mm hardened steel shackle – outstanding resistance to bolt cutters and leverage attacks
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X4P Quattro Bolt locking system – four-sided shackle engagement for maximum strength
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Z-Cylinder technology – bump-proof and resistant to picking, pulling, and drilling
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Automatic keyway cover – protects against dirt, water, and road grime
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Co-moulded crossbar with metal end caps – protects bike frames and paintwork
⛓️ Mastiff Chain
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Chain Size: 110cm (3.5ft)
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Link Diameter: 10mm
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Material: Titanium-reinforced, hardened steel
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Hexagonal link profile – resists cutting and twisting attacks
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Durable embroidered fabric sleeve – prevents frame damage and won’t flake or crack
🔑 Extras & Practical Touches
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5 laser-cut keys included
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1 LED micro-light key – perfect for night-time unlocking
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U-lock can be used independently as a disc lock
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Lifetime warranty from OnGuard
🚲 Compatibility & Application
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High-value bicycles
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E-bikes
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Motorbikes & scooters
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Urban, commuter & overnight locking
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High-risk theft locations
🔥 Why Choose the OnGuard Mastiff chain lock 8019?
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Sold Secure Gold Bicycle rating
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Dual-component security (U-lock + chain)
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Exceptional resistance to cutting & leverage
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Weather-sealed locking mechanism
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Versatile design with disc-lock functionality
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Trusted OnGuard engineering
This is a serious lock for serious riders.
🏆 Why Choose Hopkinson Cycles?
✔️ Free UK postage
✔️ Professional product knowledge
✔️ Family-run independent bike shop
✔️ Real human support – no call centres
✔️ In-house dispatch & customer service
Need advice on bike security or Sold Secure ratings? We’re happy to help.
📞 01924 274209
📧 info@hopkinsoncycles.com
🌐 www.hopkinsoncycles.com
📍 Hopkinson Cycles, Queen Street, Horbury, Wakefield, WF4 6LP
Secure your bike properly with the OnGuard Mastiff Chain Lock 8019 – trusted, tested, and Sold Secure Gold approved. 🔒🚴♂️









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