---
product_id: 4185530
title: "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: "€ 215.74"
currency: EUR
in_stock: true
reviews_count: 13
category: "Onguard"
url: https://www.desertcart.es/products/4185530-mastiff-3-5-ft-chain-lock-with-integrated-key-lock
store_origin: ES
region: Spain
---

# X2P Double Bolt Lock Head 10 mm Hardened Steel Hex Links 5 Precision Laser-Cut Keys 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:** € 215.74
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in your ride’s safety with Mastiff-level security — because your bike deserves the best.

## Quick Answers

- **What is this?** 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?** € 215.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/4185530-mastiff-3-5-ft-chain-lock-with-integrated-key-lock)

## 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

- • **Complete 5-Key Set:** Never get locked out with five laser-cut keys included for convenience and sharing.
- • **Flexible 110 cm Length:** Perfectly sized to secure your ride to racks, poles, or urban fixtures with ease.
- • **Advanced Z-Cylinder Core:** Precision lock mechanism resists bumping, drilling, and picking attempts.
- • **Titanium-Reinforced Steel Chain:** 10 mm hardened hex links engineered to withstand cutting and leverage tools.
- • **Unbreakable Double Bolt Defense:** Locks both sides for max resistance against pulling and prying attacks.

## Overview

The OnGuard Mastiff 3.5 ft Chain Lock combines a heavy-duty 10 mm titanium-reinforced hardened steel chain with an advanced X2P Double Bolt Lock Head and Z-Cylinder core, delivering superior protection against cutting, prying, and lock tampering. At 110 cm, it offers versatile locking options for bikes, scooters, and e-bikes in medium-to-high risk areas. Includes five precision laser-cut keys and a durable rubber housing to protect your bike’s finish, making it the go-to choice for security-conscious riders.

## Description

The OnGuard Mastiff 3.5 ft Chain Lock delivers serious protection for bikes, scooters, and e-bikes in medium-to-high risk environments. The 110 cm (3.57 ft) chain is built with titanium-reinforced hardened steel hex links designed to resist cutting, prying, and leverage attacks. The chain integrates directly into a heavy-duty X2P Double Bolt Lock Head, securing both sides of the locking mechanism for exceptional pull resistance. A dual rubber housing helps protect frames and finishes from scratches while also improving durability and weather resistance. The advanced Z-Cylinder core adds protection against bumping, drilling, and picking attempts for dependable long-term security. Designed for riders who want strong yet manageable protection, this chain lock offers an ideal balance of durability, portability, and everyday convenience. Includes five precision laser-cut keys.

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 Lock Head: Integrated X2P Double Bolt mechanism locks both sides for superior resistance against pulling, twisting, and prying attacks.
- Heavy-Duty 10 mm Steel Chain: Titanium-reinforced hardened steel hex links provide strong defense against cutting, leverage, and impact attacks.
- Practical 110 cm Locking Length: 110 cm (3.57 ft) chain length provides flexible locking options around racks, poles, and fixed urban objects.
- Advanced Z-Cylinder Protection: Precision locking core resists bumping, drilling, and picking for dependable anti-theft performance.
- Complete Key Set Included: Comes with five laser-cut keys.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002I8ONDC |
| Additional Features | Heavy Duty |
| Best Sellers Rank | #175,158 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #130 in Bike Chain Locks |
| Brand Name | ONGUARD |
| Color | Black |
| Control Method | App |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 4.6 out of 5 stars (511) |
| Finish Types | Painted |
| Global Trade Identification Number | 00768661280208 |
| Included Components | ONGUARD 8020 |
| Item Dimensions | 11.5 x 8 x 3 inches |
| Item Type Name | Bike Lock |
| Item Weight | 5.7 Pounds |
| Lock Type | Key Lock |
| Manufacturer | OnGuard |
| Manufacturer Part Number | 8020 |
| Manufacturer Warranty Description | 2 year manufacturer |
| Material Type | Rubber |
| Model Name | 45008020 |
| Model Number | 45008020 |
| Number of Pieces | 1 |
| Recommended Uses For Product | Cycling, Security |
| Shape | Square |
| Smart Home Compatibility | Not Smart Home Compatible |
| Style Name | Modern |
| UPC | 768661281328 768661280208 |
| Unit Count | 1.0 Count |

## 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

![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)
![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 2](https://m.media-amazon.com/images/I/71iPqqbEvnL.jpg)
![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 3](https://m.media-amazon.com/images/I/318Voo9ttYL.jpg)
![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 4](https://m.media-amazon.com/images/I/715uIbCMN3L.jpg)
![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 5](https://m.media-amazon.com/images/I/81x2LZ4wy8L.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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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-05-26*