How to Open an American Combination Lock

How to Change a Combination Lock on a Cash Box
Written By
Blair Tindall
Blair Tindall
Published: Dec 23, 2010
Updated: May 14, 2022
1 minute read

Combination locks made by the American Lock Company are popular. The distinctive round locks with black or colorful dials are used to secure lockers, bicycles, sheds and doors. These devices open using a series of three numbers that must be dialed using a precise technique.

Warnings:

  • Keep your combination in a safe place. When storing your lock between uses, keep your combination with the device.
young beautiful student girl with books in hand image by Anatoly Tiplyashin from Fotolia.com

Find the three-number combination on your lock's packaging and put it in a secure place.

Combination Lock image by Mario Ragsac Jr. from Fotolia.com

Dial clockwise to the first number, spinning the dial at least three times. For example, if the combination is "25-12-36," turn past "25" three times until the mark at the top of the dial rests on "25."

vélo 1 image by Nathalie P from Fotolia.com

Note the second number and turn counterclockwise one-and-a-half turns. If the combination is "25-12-36," pass "12" once, then turn another complete revolution.

Turn clockwise to the final number. Using the combination "25-12-36," spin directly to "36."

Pull downward on the lock, and the left side of its shackle will pull loose. You may have to push up slightly and then pull down.

Blair Tindall

Blair Tindall has written professionally since 1998 and is author of "Mozart in the Jungle: Sex, Drugs and Classical Music" (Grove/Atlantic Press). She has written for "The New York Times," "Sierra," "Business Week" and the "Financial…

Sponsored
Our Pastimes Logo

A destination for the avid collector and weekend hobbyist alike, Our Pastimes features articles and tips about your favorite cards and games, hobbies and more.

Property of TechnologyAdvice. © 2026 TechnologyAdvice. All Rights Reserved

Advertiser Disclosure: Some of the products that appear on this site are from companies from which TechnologyAdvice receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. TechnologyAdvice does not include all companies or all types of products available in the marketplace.