---
product_id: 19128849
title: "Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology"
brand: "master lock"
price: "€ 321.16"
currency: EUR
in_stock: true
reviews_count: 9
category: "Master Lock"
url: https://www.desertcart.at/products/19128849-master-lock-4-high-security-pro-series-keyed-alike-padlocks
store_origin: AT
region: Austria
---

# 4 keyed-alike high-security padlocks Weather Tough cover for harsh conditions BumpStop tech blocks lock bumping Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology

**Brand:** master lock
**Price:** € 321.16
**Availability:** ✅ In Stock

## Summary

> 🔒 Lock in your security, unlock your peace of mind.

## Quick Answers

- **What is this?** Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology by master lock
- **How much does it cost?** € 321.16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/19128849-master-lock-4-high-security-pro-series-keyed-alike-padlocks)

## Best For

- master lock enthusiasts

## Why This Product

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

## Key Features

- • **Lifetime Peace of Mind:** Limited lifetime warranty backs your investment in top-tier security.
- • **Unified Security Setup:** Four pro-grade padlocks keyed alike with 8 keys for seamless access control.
- • **Built to Brave the Elements:** Exclusive weatherproof cover and rustproof chrome finish ensure durability outdoors.
- • **Industrial-Strength Defense:** Hardened boron alloy shackles and dual ball bearing locking resist cutting and prying.
- • **Next-Level BumpStop Technology:** Patented cylinder design stops bump key attacks dead in their tracks.

## Overview

Master Lock’s Pro Series 4-pack keyed alike padlocks combine advanced BumpStop technology with rugged weatherproof design and industrial-grade materials, delivering unmatched protection against lock bumping, physical attacks, and harsh outdoor conditions—all backed by a limited lifetime warranty.

## Description

FEATURING BumpStop TECHNOLOGY - Lock bumping a surprisingly simple method of breaking in through locked doors and padlocks - is undoubtedly the newest emerging threat to personal property security. And virtually all locks in use today are particularly vulnerable to bumping. Until now. BumpStop Advanced Cylinder Technology employs an innovative, patent pending design which utilizes a unique reverse rake tapered driver pin, high performance springs and tightly machined cylinder chambers. During a bump attempt, this design prevents the transfer of force from the bump key to the pins and therefore blocks rotation of the cylinder so that the lock remains locked.

Review: Smooth as a Swiss Watch - I am not a lock expert or even a lock enthusiast, but I am involved in the metal machining business and the excellent manufacturing standards that this lock is made to is outstanding - The lock was a bit rough in its movement when it first came out of the box but a generous dose of Royal Purple lubricant in every orifice made this little tough guy very smooth, very "Friendly" in it's operation - There are some tough manufacturing requirements in this lock and Master really nailed it - The materials are well chosen for the application as well - Also - Master made it easy to get spare keys so that is an extra reason to love this sweet little guy - Awesome lock Master Lock!!
Review: Great product - Excellent quality, very sturdy exactly as described

## Features

- Four (4) High Security Locks Keyed Alike w/ 8 Keys. ProSeries Padlocks are designed for Commercial/Industrial applications. Limited Lifetime Warranty.
- These locks feature the BumpStop Advanced Cylinder Technology. (for explanation see product details below).
- ATTENTION: If you order two 4-packs they will NOT necessarily be keyed the same. To ensure you get two 4-packs keyed alike, you must order the 8-pack.
- Ideal for harsh outdoor conditions - exclusive Pro Series Weather Tough cover protects lock from water, ice, dirt and grime. Solid iron shackle shroud resists harsh physical attacks. The removable cylinder can be replaced or re-pinned. 5 spool pin tumbler cylinder for added pick resistance. Dual ball bearing locking mechanism resists pulling and prying.
- Chrome rustproofing provides longer life. These high security, rekeyable 5-pin cylinders with spool pins are virtually impossible to pick. And a dual ball bearing locking mechanism resists pulling and prying.
- Dimensions: 2-1/2 (64mm) wide round solid steel body, each weighing 1.48 lbs. A 7/16 (11mm) diameter hardened boron alloy shackle with 1-1/8 (29 mm) inside height clearance.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006M39G5Y |
| Additional Features | Key Lock |
| Best Sellers Rank | #94,467 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #222 in Keyed Padlocks |
| Brand | Master Lock |
| Brand Name | Master Lock |
| Color | Chrome |
| Control Method | App |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 out of 5 stars 459 Reviews |
| Finish Types | Chrome |
| Included Components | 4 locks, 8 keys |
| Item Dimensions | 4 x 6 x 3 inches |
| Item dimensions L x W x H | 4 x 6 x 3 inches |
| Lock Type | Pin Tumbler |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 6230NKA |
| Manufacturer Warranty Description | Limited Lifetime Warranty Master Lock Company LLC (“Master Lock”) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for … |
| Material | Alloy Steel , Chrome |
| Material Type | Alloy Steel, Chrome |
| Model Name | 6230NKA |
| Model Number | 6230NKA |
| Number of Items | 4 |
| Number of Pieces | 4 |
| Recommended Uses For Product | Security |
| Special Feature | Key Lock |
| Style Name | Industrial |
| UPC | 071649108600 |
| Unit Count | 4 Count |

## Product Details

- **Brand:** Master Lock
- **Item dimensions L x W x H:** 4 x 6 x 3 inches
- **Lock Type:** Pin Tumbler
- **Material:** Alloy Steel, Chrome
- **Special Feature:** Key Lock

## Images

![Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology - Image 1](https://m.media-amazon.com/images/I/71v1X+SKcCL.jpg)
![Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology - Image 2](https://m.media-amazon.com/images/I/6133euX5etL.jpg)
![Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology - Image 3](https://m.media-amazon.com/images/I/81r0ls8IIGL.jpg)
![Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology - Image 4](https://m.media-amazon.com/images/I/712jMPlniqL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Smooth as a Swiss Watch
*by G***S on April 25, 2026*

I am not a lock expert or even a lock enthusiast, but I am involved in the metal machining business and the excellent manufacturing standards that this lock is made to is outstanding - The lock was a bit rough in its movement when it first came out of the box but a generous dose of Royal Purple lubricant in every orifice made this little tough guy very smooth, very "Friendly" in it's operation - There are some tough manufacturing requirements in this lock and Master really nailed it - The materials are well chosen for the application as well - Also - Master made it easy to get spare keys so that is an extra reason to love this sweet little guy - Awesome lock Master Lock!!

### ⭐⭐⭐⭐⭐ Great product
*by D***N on March 13, 2026*

Excellent quality, very sturdy exactly as described

### ⭐⭐⭐⭐⭐ Goldi locks
*by D***N on November 28, 2025*

Great Locks! I leave them out in the rain and snow, and they always work. Get as many as you can with the same key, so you don't have to carry a big wad of keys around.

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**Shop now:** [https://www.desertcart.at/products/19128849-master-lock-4-high-security-pro-series-keyed-alike-padlocks](https://www.desertcart.at/products/19128849-master-lock-4-high-security-pro-series-keyed-alike-padlocks)

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-08-20*