---
product_id: 4185530
title: "OnGuard Mastiff 3.5 ft Chain Lock with Integrated Key Lock – 10 mm Hardened Steel Hex Links (110 cm / 3.57 ft) – X2P Double Bolt Lock Head, Z-Cylinder Core, 5 Keys"
brand: "onguard"
price: "5601842₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Onguard"
url: https://www.desertcart.vn/products/4185530-onguard-mastiff-3-5-ft-chain-lock-with-integrated-key
store_origin: VN
region: Vietnam
---

# X2P Double Bolt Lock Head for extreme pull resistance 10mm hardened-steel hex chain, 1090mm length Advanced Z-Cylinder core resists drilling & picking OnGuard Mastiff 3.5 ft Chain Lock with Integrated Key Lock – 10 mm Hardened Steel Hex Links (110 cm / 3.57 ft) – X2P Double Bolt Lock Head, Z-Cylinder Core, 5 Keys

**Brand:** onguard
**Price:** 5601842₫
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock down your ride with Mastiff-level muscle — because your bike deserves fortress-grade protection.

## Quick Answers

- **What is this?** OnGuard Mastiff 3.5 ft Chain Lock with Integrated Key Lock – 10 mm Hardened Steel Hex Links (110 cm / 3.57 ft) – X2P Double Bolt Lock Head, Z-Cylinder Core, 5 Keys by onguard
- **How much does it cost?** 5601842₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/4185530-onguard-mastiff-3-5-ft-chain-lock-with-integrated-key)

## Best For

- onguard enthusiasts

## Why This Product

- Trusted onguard brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Night-Ready Access:** Includes five laser-cut keys with one LED key for smooth, secure unlocking even in low-light conditions.
- • **Unmatched Security Armor:** X2P Double Bolt Lock Head delivers industry-leading pull resistance for peace of mind in high-risk zones.
- • **Precision Locking Technology:** Advanced Z-Cylinder core defends against drilling, bumping, and picking for long-term theft prevention.
- • **Weatherproof & Bike-Friendly:** Dual rubber housing protects your bike’s finish while shielding the lock from impact and harsh weather.
- • **Titanium-Reinforced Chain Strength:** 1090mm of 10mm hardened-steel hex links engineered to withstand cutting, prying, and leverage attacks.

## Overview

The OnGuard 8020 Mastiff Integrated Key Chain Lock combines a 1090mm 10mm hardened-steel hex chain with an X2P Double Bolt Lock Head and advanced Z-Cylinder core, delivering superior resistance to cutting, pulling, drilling, and picking. Designed for medium-to-high risk environments, it features dual rubber housing for weather and impact protection and includes five laser-cut keys, one with an LED light for night use. Weighing 5.7 pounds, it’s the ultimate security solution for bikes, e-bikes, scooters, and motorcycles.

## Description

The OnGuard Mastiff 3.5 ft Chain Lock is built for serious security in medium-to-high risk areas. Its 1090 mm (42.9 in) titanium-reinforced hardened-steel hex chain integrates directly into an X2P Double Bolt Lock Head for exceptional pull resistance. The advanced Z-Cylinder protects against bumping, drilling, and picking, while the dual rubber housing shields paint and finishes. Perfect for bikes, scooters, and e-bikes, this lock balances strength, durability, and ease of use. Includes five laser-cut keys, one with an LED light. Weighs 5.7 pounds.

Review: Really solid lock. - A touch heavy, still a great lock. LOVE the extra length. I carry mine in a basket so the weight does not bother me.
Review: Heavy duty and just plain heavy! But very secure! - Like carrying a tow chain. I will only use this when my bike needs to be left outdoors. Not something you’ll carry on a ride. But, it’s what I expected and definitely serves its purpose. Don’t buy it if you are expecting it to be light.

## Features

- High-Security X2P Head: Integrated X2P Double Bolt Lock Head provides extreme pull resistance and features a dual rubber housing for added impact and weather protection.
- Heavy-Duty Steel Chain: 1090 mm chain made from 10 mm hardened-steel hex links delivers superior cut, pry, and leverage attack resistance for confident daily protection. Weighs 5.7 pounds.
- Built for Riskier Areas: Ideal for medium-to-high threat environments, offering reliable defense for bikes, e-bikes, scooters, and motorcycles during everyday use.
- Advanced Z-Cylinder Core: Precision-engineered locking cylinder resists drilling, bumping, and picking, ensuring long-term reliability and theft prevention.
- Includes Five Keys: Comes with five laser-cut keys—including one LED key—offering smooth operation and excellent visibility for night-time use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002I8ONDC |
| Best Sellers Rank | #76,308 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #56 in Bike Chain Locks |
| Brand | ONGUARD |
| Color | Black |
| Control Method | App |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 4.6 out of 5 stars (509) |
| Date First Available | November 17, 2011 |
| Exterior | Painted |
| Finish Type | Painted |
| Global Trade Identification Number | 00768661280208 |
| Included Components | ONGUARD 8020 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 5.7 pounds |
| Item dimensions L x W x H | 11.5 x 8 x 3 inches |
| Item model number | 8020 |
| Lock Type | Key Lock |
| Manufacturer | OnGuard |
| Manufacturer Part Number | 8020 |
| Material | Rubber |
| Model Name | 45008020 |
| Number of Pieces | 1 |
| Product Dimensions | 11.5 x 8 x 3 inches |
| Recommended Uses For Product | Security, Cycling |
| Shape | Square |
| Special Feature | Heavy Duty |
| Special Features | Heavy Duty |
| Style | Modern |
| UPC | 768661281328 768661280208 |

## Product Details

- **Brand:** ONGUARD
- **Item dimensions L x W x H:** 11.5 x 8 x 3 inches
- **Lock Type:** Key Lock
- **Material:** Rubber
- **Special Feature:** Heavy Duty

## Images

![OnGuard Mastiff 3.5 ft Chain Lock with Integrated Key Lock – 10 mm Hardened Steel Hex Links (110 cm / 3.57 ft) – X2P Double Bolt Lock Head, Z-Cylinder Core, 5 Keys - Image 1](https://m.media-amazon.com/images/I/81tH3eB8UFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Really solid lock.
*by A***R on December 23, 2025*

A touch heavy, still a great lock. LOVE the extra length. I carry mine in a basket so the weight does not bother me.

### ⭐⭐⭐⭐⭐ Heavy duty and just plain heavy! But very secure!
*by M***N on July 2, 2025*

Like carrying a tow chain. I will only use this when my bike needs to be left outdoors. Not something you’ll carry on a ride. But, it’s what I expected and definitely serves its purpose. Don’t buy it if you are expecting it to be light.

### ⭐⭐⭐⭐⭐ Heavy chain, scary padlock!
*by K***R on July 23, 2023*

The 10mm chain is substantial. The padlock size took me aback when I first unwrapped it. The lock mechanism is smooth and easy to use. I like that the lock has a rubber coating on the U portion. I was somewhat surprised by the amount of plastic sheathing on the lock, but it does appear sturdy. I bought an OKC noose chain to go with (my Scouting unit often goes on group rides to the movies, etc., so this extends the group coverage while we're inside). The OKC links are narrower, but do slide over the lock (displacing some of the rubber coating). The OnGuard chain is robust. I could slide the nice cover enough to check all the link welds which looked good. Hoping to get many an event-free year with this lock and chain. Nothing will deter a determined thief, but this will at least divert attention elsewhere. When we go away, the lock and chains are used to secure our bikes to the floor anchor.

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**Shop now:** [https://www.desertcart.vn/products/4185530-onguard-mastiff-3-5-ft-chain-lock-with-integrated-key](https://www.desertcart.vn/products/4185530-onguard-mastiff-3-5-ft-chain-lock-with-integrated-key)

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-22*