---
product_id: 20067815
title: "Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black)"
brand: "rj lock"
price: "$17.28"
currency: USD
in_stock: false
reviews_count: 8
url: https://www.desertcart.ec/products/20067815-nut-replacement-lock-for-trailer-ball-prevent-trailer-theft-black
store_origin: EC
region: Ecuador
---

# Patented theft-proof lock Precision 1" shank fit Corrosion-resistant materials Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black)

**Brand:** rj lock
**Price:** $17.28
**Availability:** ❌ Out of Stock

## Summary

> 🔐 Lock it down, tow with confidence—because your rig deserves elite protection.

## Quick Answers

- **What is this?** Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black) by rj lock
- **How much does it cost?** $17.28 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/20067815-nut-replacement-lock-for-trailer-ball-prevent-trailer-theft-black)

## 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

- • **Built to Last Outdoors:** Anodized billet aluminum and stainless steel resist rust and salt for long-term durability.
- • **Seamless Universal Fit:** Designed for 1" shank trailer balls (1 7/8", 2", 2 5/16")—easy swap, no hassle.
- • **Unmatched Trailer Security:** Replace your standard nut with a patented lock that stops thieves in their tracks.
- • **Quick & Tool-Free Installation:** Install in minutes—just remove your old nut, lock in place, and go.
- • **The Missing Link in Theft Protection:** Complements receiver and coupler locks to fully secure your valuable trailer.

## Overview

The RJ Lock Nut Replacement is a patented security device that replaces the standard nut on 1" shank trailer balls, preventing theft by securing the ball to the trailer coupler. Crafted from corrosion-resistant anodized aluminum and stainless steel, it fits common ball sizes (1 7/8", 2", 2 5/16") and installs easily without tools. This lock is the essential final step in comprehensive trailer theft prevention.

## 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.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 an anodized 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 Link in trailer theft protection.
- Precision Made - Corrosion Resistant - Same thread count as a standard ball nut

## Technical Specifications

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

## Images

![Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black) - Image 1](https://m.media-amazon.com/images/I/71SK1CUp5hL.jpg)
![Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black) - Image 2](https://m.media-amazon.com/images/I/51MxuDFYaIL.jpg)
![Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black) - Image 3](https://m.media-amazon.com/images/I/71Nn8KQdb0L.jpg)
![Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black) - Image 4](https://m.media-amazon.com/images/I/91l6DCqVOHL.jpg)
![Nut Replacement/Lock for Trailer Ball - Prevent Trailer Theft (Black) - Image 5](https://m.media-amazon.com/images/I/91PRVLUu1kL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy to install
*by J***E on December 28, 2015*

This is a must have for any Reese Hitch trailering system. Easy to install, extremely well made, and they even provided me a HUGE wrench to remove the old nuts and install the new locks. Great product, highly recommend.

### ⭐⭐⭐ however it looked real good and well
*by S***N on August 16, 2016*

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

### ⭐ Would love to try it out.. BUT THEY FORGOT THE WRENCH!
*by G***N on March 23, 2018*

Great concept yet nobody else thought about trailer theft by 1 nut removed? This appears to be very well made & designed, I would love to rave about how good it is but I DIDN'T GET MY WRENCH that WAS SUPPOSED TO BE INCLUDED WITH MY ORDER so I can't install it. I haven't had my question about my MISSING WRENCH answered either.. where is customer service when you need it? RJ Lock? Amazon?? HELP!!

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**Shop now:** [https://www.desertcart.ec/products/20067815-nut-replacement-lock-for-trailer-ball-prevent-trailer-theft-black](https://www.desertcart.ec/products/20067815-nut-replacement-lock-for-trailer-ball-prevent-trailer-theft-black)

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-03-11*