---
product_id: 12820593
title: "Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)"
brand: "prime-line"
price: "$24.52"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/12820593-prime-line-s-4140-mailbox-lock-replacement-multipurpose-mailbox-lock
store_origin: US
region: United States of America
---

# 5-pin secure locking system Weather-resistant nickel finish Easy installation with included hardware Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)

**Brand:** prime-line
**Price:** $24.52
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in peace of mind with style and strength!

## Quick Answers

- **What is this?** Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set) by prime-line
- **How much does it cost?** $24.52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/12820593-prime-line-s-4140-mailbox-lock-replacement-multipurpose-mailbox-lock)

## Best For

- prime-line enthusiasts

## Why This Product

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

## Key Features

- • **Complete Kit:** Includes 5 cams, 2 keys, brass pins, and spring steel locking clip—everything you need in one set.
- • **Enhanced Security:** 5-pin Hudson keyway with a lock-retaining feature ensures your mail stays safe and keys never get lost.
- • **Durable Construction:** Diecast and zinc-plated steel components resist corrosion and wear for long-lasting protection.
- • **Effortless Operation:** Smooth counter-clockwise 90º rotation unlocks your mailbox with ease and precision.
- • **Universal Compatibility:** Fits top mailbox brands like American Device & Auth-Florence for seamless replacement.

## Overview

The Prime-Line S 4140 Mailbox Lock is a versatile, weather-resistant replacement lock compatible with multiple mailbox brands. Featuring a secure 5-pin Hudson keyway, corrosion-resistant nickel finish, and a complete hardware kit, it offers easy installation and reliable protection for your mail.

## Description

Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)

## Features

- REPLACEMENT LOCK – This multipurpose Prime-Line replacement mailbox lock is an easy fix and can easily replace lost or broken mailbox locks. Features 5 cams and an Hudson 1003M key
- WORKS FOR SEVERAL BRANDS – This replacement mailbox lock works with several brands of mailboxes, including: American Device, Auth-Florence, Bommer, and Miami-Carey.
- INCLUDES – Replacement lock kit includes a total of 5 zinc-plated steel cams, brass pins, a spring steel locking clip and 2 keys.
- LOCKING SECURITY FEATURE – This lock has a security feature that prevents the key from being removed when in the unlocked position, which prevents forgetting the key, and ensuring the mailbox is locked every time it’s used.
- NOTE – This mailbox lock unlocks by turning the included keys in a in the counter-clockwise direction and has a retaining hex nut and retaining clip

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | PRIME-LINE |
| Special Feature | Weather Resistant |
| Lock Type | Key Lock |
| Item dimensions L x W x H | 1.25 x 3.81 x 4.88 inches |
| Material | Diecast / Steel |
| Recommended Uses For Product | Security |
| Style | Mailbox Lock |
| Color | Nickel |
| Number of Pieces | 1 |
| Finish Type | Nickel,Nickel-plated |
| Included Components | 2 keys, lock and fasteners |
| Controller Type | Hand Control |
| Shape | Round |
| Item Weight | 3.44 ounces |
| Control Method | Touch |
| UPC | 049793041401 |
| Model Name | Mailbox Lock |
| Global Trade Identification Number | 00049793041401 |
| Manufacturer | Prime-Line Products |
| Part Number | S 4140 |
| Product Dimensions | 1.25 x 3.81 x 4.88 inches |
| Item model number | S 4140 |
| Is Discontinued By Manufacturer | No |
| Size | 1 Pack |
| Finish | Nickel,Nickel-plated |
| Item Package Quantity | 1 |
| Special Features | Weather Resistant |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | Warranty |

## Product Details

- **Brand:** PRIME-LINE
- **Special Feature:** Weather Resistant
- **Lock Type:** Key Lock
- **Item dimensions L x W x H:** 1.25 x 3.81 x 4.88 inches
- **Material:** Diecast / Steel

## Images

![Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set) - Image 1](https://m.media-amazon.com/images/I/61Ivf-HAnlS.jpg)

## Available Options

This product comes in different **Colour Name** options.

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**Shop now:** [https://www.desertcart.us/products/12820593-prime-line-s-4140-mailbox-lock-replacement-multipurpose-mailbox-lock](https://www.desertcart.us/products/12820593-prime-line-s-4140-mailbox-lock-replacement-multipurpose-mailbox-lock)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-09*