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Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock
Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock

Master Lock 1-9/16 in. W Metal 4-Digit Combination Combination Padlock

Set your own 4-digit code and skip the keys entirely - one less thing to lose track of.
Master Lock MPN 643D In Stock & Ready to Ship
$9.99
Free shipping on orders over $75
Ships within 24 hours · most orders arrive in about 2 business days

About Product Overview

No keys to track down or hand out means one less thing to worry about when you're locking up gear, gates, or lockers. This Master Lock combination padlock uses a 4-digit code you set yourself, so access is as simple as remembering a number. The 1-9/16" metal body stands up to daily use on sheds, toolboxes, gym lockers, and storage units.

  • Brand: Master Lock, model 643D
  • 4-digit combination locking mechanism
  • Metal lock body, 1-9/16" width
  • Not keyed alike, not rekeyable
  • Sold individually in clamshell packaging

The Details Specifications

Brand Master Lock
Model / MPN 643D
UPC 071649214493
Weight Under 1 lb
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Master Lock. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Master Lock

Or skip the tabs entirely and buy it down the street. Find a store near you →

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Ask our counter. Or theirs.

Most hardware stores can do more than you think. If we can't help you, the folks down the street probably can — just ask at the counter.

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Their Counter
Try local first · we'll wait

The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

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About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a familiar banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

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