Onguard Mastiff 8019L 18-Inch Chain Lock with Boxer U-Lock - Harley & Indian V-Twin
About Onguard
Onguard parts and accessories are stocked at Vtwinbikers for Harley-Davidson and Indian Motorcycle applications. Every Onguard item we list is new and sourced through authorized distribution. If you are not certain a part matches your year and model, use Shop by Bike or email our team before you order and we will confirm fitment first.
The Onguard Mastiff 8019L offers robust security for your Harley-Davidson or Indian Motorcycle. This 18-inch titanium-reinforced hardened steel chain lock is paired with a versatile Boxer U-lock, providing comprehensive protection.
Why riders pick this
- 18-inch titanium-reinforced hexagonal steel chain
- X4 Quattro Bolt U-lock for maximum security
- Boxer U-lock can be used as a standalone disc lock
- Includes five laser-cut keys, one with micro-light
When you need reliable security for your V-twin, the Onguard Mastiff 8019L delivers. Its 18-inch chain features titanium-reinforced hexagonal links, designed to resist cutting and prying from multiple angles. Paired with the X4 Quattro Bolt locking mechanism of the Boxer U-lock, this system provides a formidable deterrent against theft, ensuring your motorcycle stays where you left it.
Advanced Locking for V-Twin Security
- 18-inch titanium-reinforced hardened steel hexagonal chain
- X4 Quattro Bolt locking mechanism for superior resistance
- Boxer U-lock functions as a standalone disc lock
- Includes five laser-cut keys, one with a bright micro-light
Versatile and User-Friendly Protection
The Mastiff 8019L provides flexibility for various security needs. Use the full chain and U-lock combo for anchoring your bike to a fixed object, or detach the Boxer U-lock for quick disc brake security. The included micro-light key is a practical feature, illuminating the lock in low-light conditions, making securing your Harley or Indian easier and more efficient.
Specifications
- Brand: Onguard
- Manufacturer Part #: 45008019L
- UPC: 768661280758
- Length: 18 in
- Width: 6.5 in
- Height: 2 in
- Weight: 10.1 lbs
- Country of Origin: China (Mainland)
Common questions
Can the Boxer U-lock be used separately?
Yes, the Boxer U-lock is designed to detach from the chain and can function independently as a disc brake lock, offering flexible security options.
How many keys come with this lock system?
The Onguard Mastiff 8019L includes a total of five laser-cut keys: one micro-light key for visibility in the dark and four standard grip keys.
What is the length of the chain?
The chain measures 18 inches, providing enough length to secure the frame or wheels of your V-twin motorcycle to a fixed object.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Onguard |
| TYPE | Security |
| SKU | 57-9603 |
| WEIGHT | 10.1 lb |
