---
product_id: 43611264
title: "RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver)"
brand: "rj lock"
price: "HK$2"
currency: HKD
in_stock: false
reviews_count: 8
url: https://www.desertcart.hk/products/43611264-rj-lock-nut-replacement-lock-for-trailer-ball-prevent-trailer
store_origin: HK
region: Hong Kong
---

# Patented theft protection Precision made Corrosion resistant RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver)

**Brand:** rj lock
**Price:** HK$2
**Availability:** ❌ Out of Stock

## Summary

> 🔐 Lock It Down: Your Trailer's Best Defense Against Thieves!

## Quick Answers

- **What is this?** RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver) by rj lock
- **How much does it cost?** HK$2 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/43611264-rj-lock-nut-replacement-lock-for-trailer-ball-prevent-trailer)

## Best For

- rj lock enthusiasts

## Why This Product

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

## Key Features

- • **Universal Fit:** Easily replaces standard 1" shank ball nuts for hassle-free installation.
- • **Complete Protection:** The missing link in trailer theft prevention—don't leave your equipment vulnerable!
- • **Corrosion Resistant:** Built to withstand the elements, ensuring long-lasting security.
- • **Precision Engineering:** Crafted with the same thread count as standard ball nuts for a perfect fit.
- • **Secure Your Investment:** Protect your trailer with patented RJ Lock technology.

## Overview

The RJ Lock is a patented nut replacement designed to secure your trailer ball, preventing theft and ensuring peace of mind. With easy installation and universal compatibility for standard 1" shank sizes, this precision-engineered lock is corrosion-resistant and provides the ultimate protection for your valuable equipment.

## Description

CURRENTLY ONLY MADE TO FIT TRAILER BALLS WITH A 1" SHANK DIAMETER. WILL NOT FIT A 0.75" or 1 1/4" SHANK DIAMETER. Some aluminum ball mounts require a longer ball shank in order to properly install the RJ LOCK. If you have a ball mount stabilizer or other questions, please Contact seller. p>This one-of-a-kind security lock replaces your existing nut under the trailer ball to prevent theft of your unattended trailer equipment. You ever drop your boat and leave your trailer hooked up to vehicle? You own a business and tow valuable stuff? Even with the typical hitch receiver and coupler locks in place, one can easily unscrew the nut that holds the ball on your trailer hitch, then lift up the trailer ball still attached to the trailer coupler, drop the ball stud/shank into the hitch ball hole on the getaway vehicle, and off goes your entire rig!Installation is as easy as 1, 2, 3. Remove your existing ball mount nut, replace with the new nut fitting and secure the housing with the push of the lock and that's it! This patented lock is designed to fit your existing ball mount with a 1 inch diameter trailer ball shank. Typically this is a 1 7/8", 2" or some 2 5/16" balls, with the 1" shank. Every component of the RJ Lock is built for ultimate strength and corrosion protection. The major components are built from a mirror polished solid billet aluminum housing and a dense plated steel fitting. The keyed lock within the housing is custom made of stainless steel and brass. This salt tested lock will absolutely standup to corrosion!Once installed, the RJ Lock stays on, just like a typical nut, unless you need to change out the ball. So get your RJ Lock today and for a small cost, eliminate one more way your expensive stuff can be stolen. Your satisfaction is guaranteed.

## Features

- Tow anything of Value? Secure your trailer with this patented lock that replaces the nut under the hitch-ball to protect against trailer theft. SEE PRODUCT DESCRIPTION BELOW FOR MORE DETAILS
- Remove the exiting nut on your trailer ball with a 1" shank, and secure the universally fit RJ Lock in its place. Easy installation. (The typical 1" shank has a 1 7/8", 2" or 2 5/16" ball. RJ Lock not currently made for 3/4" or 1 1/4" ball shanks.)
- Even with the receiver and coupler locks - you're unattended trailer equipment is not fully protected! This lock is the Missing Ling in trailer theft protection.
- Precision Made - Corrosion Resistant - Same thread count as a standard ball nut

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Robert James Innovations |
| Brand | RJ Lock |
| Item Weight | 1.55 pounds |
| Product Dimensions | 2.75 x 3.5 x 1.6 inches |
| Item model number | RJ-S |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | RJ-S |

## Images

![RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver) - Image 1](https://m.media-amazon.com/images/I/61lAS1En2BL.jpg)
![RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver) - Image 2](https://m.media-amazon.com/images/I/51veOST7gxL.jpg)
![RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver) - Image 3](https://m.media-amazon.com/images/I/71LJPCQjaRL.jpg)
![RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver) - Image 4](https://m.media-amazon.com/images/I/9113+teknwL.jpg)
![RJ Lock - Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Silver) - Image 5](https://m.media-amazon.com/images/I/91z+KdYVavL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Great product
  

*by J***. on Reviewed in the United States on March 24, 2019*

Innovative and great looking along with providing theft protection.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Close the weak spot on a trailer hitch
  

*by J***R on Reviewed in the United States on September 12, 2019*

Great innovation that closes an obvious weak spot in a trailer hitch.  Superb quality and craftmanship.

### ⭐⭐⭐ 3.0 out of 5 stars







  
  
    however it looked real good and well
  

*by S***N on Reviewed in the United States on August 16, 2016*

Didn't fit my trailer ball nut. I returned it, however it looked real good and well made

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**Shop now:** [https://www.desertcart.hk/products/43611264-rj-lock-nut-replacement-lock-for-trailer-ball-prevent-trailer](https://www.desertcart.hk/products/43611264-rj-lock-nut-replacement-lock-for-trailer-ball-prevent-trailer)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-24*