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Master Lock 510D Lock with Adjustable Shackle, 1-3/4-inch

TLDR Review: Master Lock 510D

By ShopSavvy Team

Published: June 8th, 2025

Last Updated: July 18th, 2025

Pros

•Great quality for a reasonable price.
•Versatile: suitable for multiple doors and areas.
•Strongly recommended by some users.

Cons

•The padlock design allows it to come off easily and can be reattached upside down, blocking key access.
•The product may necessitate removal by cutting if mishandled.
•Users have reported a consistent design flaw causing assembly issues.
•There is a risk of incorrect assembly that renders the product unusable.
•Necessary tools for disassembly might incur additional costs.
•The locking mechanism tends to fail after a year of use.
•Quality of the locks has deteriorated over time, leading to frequent replacements.
•Users are dissatisfied with the company's contribution to environmental issues due to frequent replacements.

Bottom Line

The Master Lock 510D Lock offers good quality at a reasonable price and suits multiple locking purposes. However, it has significant design flaws that can lead to installation mistakes, rendering the lock unusable, and potential issues with the locking mechanism over time. If reliability and ease of installation are priorities, you might want to consider alternative products.

Lowest at Amazon

$8.59 at Amazon

How we researched this

About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from 1 retailers to give you the short version.

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