Master Lock 6-Keyed Alike Padlocks with BumpStop Technology – 12 Keys (3NKALF-6)

Overview

Meet a versatile set designed for multi-lock convenience and real‑world security needs. This Master Lock offering includes six padlocks that are keyed alike, accompanied by twelve keys in total. The arrangement lets you manage multiple gates, sheds, lockers, or tool chests with a single, streamlined key system—reducing clutter and simplifying daily use while keeping belongings organized.

Innovative BumpStop Technology

What sets this set apart is the BumpStop Advanced Cylinder Technology. It employs a unique reverse rake tapered driver pin, high performance springs, and tightly machined cylinder chambers. During a bump attempt, the design prevents the transfer of force from the bump key to the pins and, therefore, blocks rotation of the cylinder so the lock remains locked. This description emphasizes how the design aims to deter bumping scenarios while acknowledging that outcomes can vary by context and use.

In addition to bump resistance, the internal engineering contributes to overall security and reliability. The combination helps synchronize multiple locks so they respond consistently to the same key system in everyday scenarios.

Build, Hardware, and Durability

The padlocks feature a reinforced laminated steel body with a 1-9/16 inch (41 mm) width, a 1-1/2 inch (38 mm) tall shackle, and a 9/32 inch (7 mm) diameter shackle. Dual ball bearings locking adds pry resistance, while a rugged 4‑pin tumbler enhances reliability. Hardened bottom plates improve drill resistance, and top and bottom bumpers contribute to scratch resistance, helping the locks endure outdoor use and rough handling over time.

Key specs and warranty at a glance help you assess fit for your setup and peace of mind.

• Six padlocks keyed alike with twelve keys; BumpStop Technology included in this set; optional non-BumpStop version available by searching 3KALF.
• Outdoor-ready construction with a laminated steel body, reinforced frame, and 1-1/2 inch shackle.
• Security-minded internals: dual ball bearings, a four-pin tumbler, and hardened components for longer life.
• Limited lifetime warranty from Master Lock.

Practical Uses and Benefits

This keyed-alike arrangement is ideal when you need multiple locks in outdoor storage, gates, sheds, tool chests, or equipment lockers but want to manage everything with one key system. The rugged build and protective features aim to perform in dusty or damp environments, with a balance of ease of use and durability. While not a guarantee, customers may find the setup reduces key clutter and simplifies access control across shared spaces.