Locksmithing, Second Edition
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About this ebook
Filled with easy-to-follow instructions, illustrations, charts, and checklists, this updated locksmithing resource covers locking mechanisms used in today's residential, automotive, commercial, and electronic security devices. Whether you want to install a home security system or start a successful locksmithing business, you'll find what you need in this book. Details about licensing and certifications and a sample Registered Professional Locksmith exam are included.
Locksmithing, Second Edition covers:
- Warded, lever tumbler, disc tumbler, side bar wafer, and pin tumbler locks
- Locksmithing tools
- Key-in-knob, deadbolt, and cylinder key mortise locks
- High-security cylinders
- Pushbutton combination locks
- Lock picking, impressioning, and forced entry
- Masterkeying
- Safe basics and drilling open safes
- Bumping keys
- Key coding machines
- Closed circuit television systems
- Access control, alarms, and system integration
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Locksmithing, Second Edition - Bill Phillips
LOCKSMITHING
ABOUT THE AUTHOR
Bill Phillips is president of the International Association of Home Safety and Security Professionals. A security consultant and freelance writer, his articles have appeared in Consumers Digest, Home Mechanix, Keynotes, the Los Angeles Times, Locksmith Ledger International, the National Locksmith, Safe and Vault Technology, Security Dealer, and the World Book Encyclopedia. Mr. Phillips is also the author of numerous security-related books, including The Complete Book of Locks and Locksmithing, Sixth Edition; The Complete Book of Electronic Security; The Complete Book of Home, Site and Office Security; and Master Locksmithing, all published by McGraw-Hill.
LOCKSMITHING
Bill Phillips
Second Edition
Copyright © 2010, 2000 by Bill Phillips. All rights reserved. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher.
ISBN: 978-0-07-162527-2
MHID: 0-07-162527-5
The material in this eBook also appears in the print version of this title: ISBN: 978-0-07-162275-2, MHID: 0-07-162275-6.
All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they have been printed with initial caps.
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Information contained in this work has been obtained by The McGraw-Hill Companies, Inc. (McGraw-Hill
) from sources believed to be reliable. However, neither McGraw-Hill nor its authors guarantee the accuracy or completeness of any information published herein, and neither McGraw-Hill nor its authors shall be responsible for any errors, omissions, or damages arising out of use of this information. This work is published with the understanding that McGraw-Hill and its authors are supplying information but are not attempting to render engineering or other professional services. If such services are required, the assistance of an appropriate professional should be sought.
TERMS OF USE
This is a copyrighted work and The McGraw-Hill Companies, Inc. (McGraw-Hill
) and its licensors reserve all rights in and to the work. Use of this work is subject to these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decompile, disassemble, reverse engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-Hill’s prior consent. You may use the work for your own noncommercial and personal use; any other use of the work is strictly prohibited. Your right to use the work may be terminated if you fail to comply with these terms.
THE WORK IS PROVIDED AS IS.
McGRAW-HILL AND ITS LICENSORS MAKE NO GUARANTEES OR WARRANTIES AS TO THE ACCURACY, ADEQUACY OR COMPLETENESS OF OR RESULTS TO BE OBTAINED FROM USING THE WORK, INCLUDING ANY INFORMATION THAT CAN BE ACCESSED THROUGH THE WORK VIA HYPERLINK OR OTHERWISE, AND EXPRESSLY DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. McGraw-Hill and its licensors do not warrant or guarantee that the functions contained in the work will meet your requirements or that its operation will be uninterrupted or error free. Neither McGraw-Hill nor its licensors shall be liable to you or anyone else for any inaccuracy, error or omission, regardless of cause, in the work or for any damages resulting therefrom. McGraw-Hill has no responsibility for the content of any information accessed through the work. Under no circumstances shall McGraw-Hill and/or its licensors be liable for any indirect, incidental, special, punitive, consequential or similar damages that result from the use of or inability to use the work, even if any of them has been advised of the possibility of such damages. This limitation of liability shall apply to any claim or cause whatsoever whether such claim or cause arises in contract, tort or otherwise.
For Merlin and Ondra (HAH, HMB)
CONTENTS
Acknowledgments
Introduction
Chapter 1 The Business of Locksmithing
The Locksmithing Business
Learning the Business
Employment Options
Chapter 2 Basic Types of Locks and Keys
Terminology
Types of Keys
Chapter 3 Key Blanks and Key Blank Directories
Choosing the Right Blank
Key Blank Directories
Cutting Keys by Hand
Chapter 4 Warded, Lever Tumbler, Disc Tumbler, and Side Bar Wafer Locks
Warded Locks
Lever Tumbler Locks
Disc Tumbler Locks
Side Bar Wafer Locks
Chapter 5 Pin Tumbler Locks
Operation
Repairs
Tubular Key Locks
Chapter 6 Locksmithing Tools
Electric Drill
Cordless Drill
Broken-Key Extractor
Plug Follower
Plug Holder
Tool Lists
Chapter 7 Key-in-Knob, Deadbolt, and Cylinder Key Mortise Locks
Handing of Doors
Key-in-Knob Locks
Deadbolt Locks
Cylinder Key Mortise Locks
Chapter 8 High-Security Cylinders
The CorKey System
DOM IX KG System Cylinder
Kaba Gemini
Medeco Cylinders
Schlage Primus Cylinders
Chapter 9 Pushbutton Combination Locks
1000 Series Locks
Series 3000
Chapter 10 Lock Picking, Impressioning, and Forced Entry
Lock Picking
Key Impressioning
Forced Entry Techniques
Chapter 11 Masterkeying
Warded Locks
Lever Tumbler Locks
Disc Tumbler Locks
Pin Tumbler Locks
Chapter 12 Safe Basics
Types of Safes
Safe Styles
Installing an in-Floor Safe
Moving Safes
Special Safe Features
UL Fire Safe Ratings
UL Burglary Safe Standards
Chapter 13 Drilling Open Safes
How Big the Hole Should Be
Where to Drill
Drilling the Lever Screw
Drilling the Fence
Chapter 14 Bumping Keys
How to Bump Locks Open
What to Do about Bump Keys
Chapter 15 Key Coding Machines
Theory of Code Key Cutting
KD80 Code Cutting Key Machine
Exacta Code Key Cutter
Framon DC-300 Duplicating Code Machine
Borkey 989 Top-Cut
Chapter 16 Automotive Lock Servicing
Basics
Automotive Lock Differences
Vehicle Identification Numbers
American Motors Corporation
Audi
BMW
Chrysler
Datsun
Honda
Ford
General Motors
Opening Locked Vehicles
Chapter 17 Closed Circuit Television Systems
Basics
Pan-and-Tilt Technology
Consider the Big Picture before Installing a CCTV System
Chapter 18 Access Control, Alarms, and System Integration
Plan Component Design Prior to Installing System
A New Breed of Standalone Readers: The High-Security Alternative
Design and Integration of Alarm Systems into Access Control Systems
Integrated Fire Alarm and Security Systems
The Art of Integrating Fire and Security Systems
Systems Integration: More Than the Sum of Its Parts
Integrated Systems: The Whole-Building Approach
Chapter 19 Working as a Locksmith
Locksmithing Associations
Certifications
Licensing
Planning Your Job Search
Starting Your Own Business
Laws about Duplicating Keys
Sue Yourself … Before Someone Else Does
Ethics of Locksmithing
Chapter 20 Test Your Knowledge
Registered Professional Locksmith Answer Sheet
Locksmithing FAQs
Appendices
A Lockset Function Charts
B Comparative Key Blank List
C Depth and Space Charts
D ANSI/BHMA Finish Numbers
Glossary
Index
ACKNOWLEDGMENTS
While writing this book, I received help from many companies and individuals. Much of it was in the form of technical information, photographs, drawings, advice, and encouragement. Without such assistance, this book could not have been written.
I’d like to thank all the readers of my locksmithing books and articles who took the time to write to me. I was happy to read every letter, even the most critical ones. Those comments and questions helped make this book what it is.
Special thanks go to my editor, Joy Bramble, for her guidance, and to Acquisitions Coordinator Michael Mulcahy. Additionally, I would like to thank the McGraw-Hill Production staff for its work in effectively producing this Second Edition.
I’d also like to thank the following for their technical assistance: A-1 Security Manufacturing Corp.; Alarm Lock Systems, Inc.; Arrow Mfg. Co.; Associated Locksmiths of America; CCTV Corp.; Control Systems International; Dom Security Locks; ESP Corporation; Folger Adam Company; Framon Manufacturing Co. Inc.; Anthony A. J.
Hoffman, CML; Ilco Unican Corporation; the International Association of Home Safety and Security Professionals; Jerry L. Jacobson, Ph.D. of Vicon Industries, Inc.; Keedex Mfg.; Kustom Key, Inc.; Kwikset Corporation/A Safer America; Lori Corporation; Master Lock Company; MBS Fire Technology Inc.; Medeco Security Locks; Bert Michaels; Monarch Tool & Mfg. Co., Inc.; Wayne D. Moore of MBS Fire Technology; Stephen F. Nelson of Honeywell, Inc.; Charlie Pierce of L.R.C. Electronics Company; Ashley R. Rolfe of Newman Tonks, Inc.; Schlage Lock Company; Charles A. Sennewald, CMC, CPP; Lionel Silverman; Simplex Access Controls Corporation; Slide Lock Tool Company; Lars R. Suneborn of Hirsch Electronics; Michael Swiecicki of Simplex Time Recorder Company; and Frederick D. Bud
Toye of Toye Corporation.
Finally, I’m especially grateful to the following: my sons Michael and Danny; and to Janet Griffin and Patricia Bruce, for their encouragement, inspiration, and willingness to listen.
INTRODUCTION
While writing this book, I kept three goals in mind: Make it simple to understand; provide everything someone needs to know to begin a lucrative career in locksmithing; and make it an indispensable reference source for the security professional. Throughout this book, I include step-by-step instructions and helpful illustrations, charts, and checklists. I explain in detail how to quickly pick open locks, how to make impression keys, how to open any car door, and how to install and service various types of locks.
Among the topics here that are especially useful for someone planning a career in locksmithing are how to get hired as a locksmith, how to start a successful locksmithing business, the pros and cons of joining a locksmithing association, legal and ethical issues in locksmithing, and licensing and certifications. This second edition includes three new chapters—safe basics, drilling open safes, and bumping keys—as well as a new exam in Chapter 20, Test Your Knowledge.
I often get questions from readers of my articles and books, who include locksmiths, students, and apprentices. In the frequently asked questions
portion of this book, I provide direct, no nonsense
answers and share my trade secrets and personal experience—giving my opinions, when appropriate.
After you’ve read Locksmithing, please let me know what you think. Also, please let me know what you’d like to see in the next edition. Send your comments and questions to: Bill Phillips, Box 2044, Erie, PA 16512-2044, or send an e-mail to LocksmithWriter@aol.com.
LOCKSMITHING
CHAPTER 1
The Business of Locksmithing
Locksmith Wanted for Chicago Area … Plenty of work.
Bondable locksmith needed for outside work in Upstate New York area.
Detroit is having a recession, but we’re not!! Join the team of one of the most progressive locksmith shops in the country.
Advertisements similar to these appear in issues of trade journals. Trade journals regularly include help wanted
ads from locksmith shops throughout the United States. Similar ads appear in local newspapers every day. As is pointed out by the Encyclopedia of Careers and Vocational Guidance, Tenth Edition (1997), The locksmith trade itself has remained stable, with few economic fluctuations, and locksmiths with an extensive knowledge of their trade are rarely unemployed.
The Locksmithing Business
In the past, a locksmith was basically a hybrid of carpenter and mechanic. The locksmith’s work was limited mainly to installing mechanical locksets, opening locked car doors, rekeying mechanical locks, and duplicating keys (Figure 1.1). As more automobile clubs and department stores began competing for those jobs, locksmiths responded by offering more services.
In addition to the usual services, locksmiths now sell, and maintain, a wide array of sophisticated security devices (Figure 1.2). The changing role of locksmiths can be seen as increasing numbers of colleges and institutions combine their physical and electronic security departments, making one department responsible for establishing key control, maintaining physical locking devices, and installing and servicing electronic access control systems. (See Chapter 18 for information on access control systems.)
QUICK >>> TIP
Increasingly, locksmithing jobs appear on the Internet before or instead of being printed in newspapers and trade journals. To find current listings, check the Web sites of locksmithing-related trade associations, or do an online search. Try the keywords locksmith
and locksmithing
with jobs
and employment.
A person planning to become a locksmith should be able to use the most common hand and power tools, be mechanically inclined, be a good reader, and have no serious criminal record. Because many locksmithing jobs require the locksmith to drive, a good driving record can also be helpful.
FIGURE 1.1 Although today’s locksmith offers a wide variety of services, lock installation is still a major part of locksmithing.
Learning the Business
Most locksmiths get their initial training either by working as an apprentice or by completing a correspondence course. Some people use books and videotapes to teach themselves locksmithing. Others learn the trade by completing a residential program at a college or trade school.
FIGURE 1.2 In addition to locks, today’s locksmith installs sophisticated security devices. (Courtesy of MRL Inc.)
I learned through each of those methods. I first began studying locksmithing by reading and practicing on my own. Next I completed several correspondence courses. Then I began working as an apprentice. Eventually I attended the now defunct National School of Locksmithing & Alarms in New York City.
As a rule, the most comprehensive training comes from a good residential program. Such a program exposes a person to a wide variety of locking devices and tools and combines hands-on training with lectures and reading material. However, few people live close enough to a residential program to become a student, and many residential programs are expensive and time consuming. Because there was no locksmithing school close to me, I had to move hundreds of miles away and live there for about nine months. The tuition was nearly $5000. Correspondence courses typically cost from a few hundred dollars to about $1000. The most popular ones come with various locksmithing tools (including a key duplicating machine), and allow you to consult with an instructor by telephone while you’re taking the course.
Certainly there are advantages to hands-on, in-person instruction, and in working with an instructor by mail and over the phone. But books and videos can be a great low-cost alternative. You can probably find locksmithing books in your public library. Locking device manufacturers often make informative service/installation manuals and videos, and provide them to locksmiths for free or at little cost.
The least expensive way to learn the trade is through on-the-job training. How much you can learn working as an apprentice depends on who you’re working under and how much your mentor wants to teach you. Some locksmiths see employees as potential competition and are leery of sharing knowledge. Such a locksmith is likely to teach only a few basic tasks, such as key cutting and floor sweeping. Another problem with learning as an apprentice is that teaching is a special skill, and few people can do it well. The fact that a locksmith has a lot of knowledge and experience doesn’t mean he or she can properly teach another person.
Regardless of how a person learns the basics, every locksmith needs to continue learning throughout his or her career. Continuing education comes from reading books, taking residential or correspondence classes, reading trade and professional journals, and talking with more experienced locksmiths and other security professionals.
Employment Options
QUICK >>> TIP
If you wait for about a month before responding to enrollment literature from a correspondence school, you’ll probably get a letter offering reduced tuition. If you continue to wait another month or so, the tuition will likely drop even more and you’ll probably be offered other incentives (such as tools or supplies at no extra charge).
Some of the work opportunities for locksmiths include owning or working in a locksmithing shop, working as an in-house locksmith for a private or public organization, working for a manufacturer or distributor, teaching, and designing security-related products. Most people begin their locksmithing career by working for a locksmithing shop. This allows a person to gain a great deal of experience while being paid. Other people prefer to begin their own locksmithing business without first working for another locksmithing shop.
Owning a Shop
Successful owners of locksmithing shops usually have business acumen and a broad base of locksmithing skills. Many small shops are one-person or family operations, with the owner wearing all the hats. Other locksmithing shops have 30 or more full-time employees, and the owners rarely have to go out on calls. The number of employees a shop has isn’t as important to its success as the range and quality of work the shop performs.
There are two basic types of locksmithing shops: storefront and mobile. A storefront shop is operated from a building customers walk into. A mobile shop is operated from a vehicle, usually a van or truck. Mobile shops always go to the customer to perform services. Most storefront shops use vehicles to allow them to offer both in-store and mobile services (Figure 1.3).
This flexibility gives the storefront more money-making opportunities than the mobile shop. A building gives a business a more professional and stable image, which helps in obtaining work. A building also provides a place to display a variety of merchandise. However, a storefront shop is more expensive to start and operate than a mobile shop. Rent, utility bills, merchandise, and additional equipment are a few of the extra expenses a storefront shop has.
Low start-up and operating costs are two reasons many locksmiths prefer operating a mobile shop. Another is that a mobile shop owner doesn’t need a broad range of locksmithing skills because mobile shops generally offer only a few services.
Working in a Shop
Although there are a few notable exceptions, most mobile shops don’t hire employees. When mobile shop owners need help, they usually subcontract work to other locksmiths. This allows mobile shop owners to avoid the cost of employee compensation insurance, employee benefits, extra record keeping, etc.
A locksmith who works for a small to mid-size shop has varied tasks daily. On any given day he or she may go out to install several locksets, open a car door, and change a safe combination, then go back to the shop to rekey some locks and wait on customers.
Some large shops assign specific duties to their locksmiths. For example, one may be assigned to only wait on customers, another to just service locking devices in the shop, and another to go out on calls. Sometimes the jobs are even more specific—such as only servicing safes.
FIGURE 1.3 Using both a storefront and a service vehicle allows a locksmith to sell merchandise and offer out-of-shop services. (Courtesy of Roy’s Lock Shop)
Locksmiths who work in a shop usually earn an hourly wage plus extra pay for night and weekend work. Some hard-working locksmiths earn more money working overtime than they make as their base pay. A few also earn commissions for selling merchandise.
In-House Locksmiths
Universities, school systems, hotels, and cities are major employers of in-house locksmiths. Competition is fierce for in-house jobs because they usually offer good pay, job security, and a controlled work environment.
Most locksmiths who work in-house once worked for a locksmithing shop. In-house locksmiths often have a broad range of locksmithing skills, but rarely have to use most of those skills. Their work is usually limited to installing and servicing a few types and brands of security devices and hardware. In-house locksmiths don’t ordinarily have to sell merchandise.
TRADE SECRET
A locksmith can earn extra money by being on call to open locked cars and homes on Sundays, holidays, and at night.
Working for a Manufacturer or Distributor
Manufacturers and distributors of security products and supplies are good sources of employment for many locksmiths (Figure 1.4). They hire locksmiths to stock products, sell merchandise, help develop new products, and conduct seminars. Sometimes they hire apprentice locksmiths to sell merchandise or stock products.
Instructors
Locksmithing instructors usually have at least five years of locksmithing experience. Some schools require their instructors to also have at least 120 hours of teacher training.
FIGURE 1.4 Manufacturers and distributors of locksmithing products are good sources of employment for locksmiths. (Courtesy of Accredited Lock Supply Co.)
Manufacturers of locking devices frequently use instructors to conduct seminars. However, few locksmiths make their living solely by teaching; most also work in a shop.
Designing Security-Related Products
Some locksmiths have made money designing new locking devices and products to make locksmithing easier. Many of them are employed by manufacturers, but it isn’t unusual for locksmiths to invent new tools or to creatively modify locking devices while working for a locksmithing shop. Some locksmiths have formed their own companies to manufacture their inventions. Others have sold their ideas.
To learn more about finding a job as a locksmith, start a locksmithing business, or how to get certified or licensed, see Chapter 19.
CHAPTER 2
Basic Types of Locks and Keys
Terms such as mortise bit-key lock
and Medeco key-in-knob lock
mean little to most people, but provide useful information to locksmiths. Like other trades, locksmithing has its own vocabulary to meet its special needs.
Terminology
Laypersons frequently use a generic name like padlock, automobile lock, or cabinet lock when referring to a lock. Such a name has limited value to locksmiths because it is very general. It simply refers to a broad category of locks that are used for a similar purpose, share a similar feature, or look similar to one another.
Locksmiths identify a lock in ways that convey information needed to purchase, install, and service it. The name they use is based not only on the purpose and appearance of the lock, but also on the lock’s manufacturer, key type, method of installation, type of internal construction, and function.
The names used by a locksmith are typically formed by combining several words. Each word in the name provides important information about a lock. The number of words a locksmith uses for a name depends on how much information he or she needs to convey.
When ordering a lock, for instance, the locksmith needs to use a name that identifies the lock’s purpose, manufacturer, key type, appearance, etc. However, a name that simply identifies the lock’s internal construction may be adequate for describing a servicing technique to another locksmith.
Generic Names
Some of the most commonly used generic lock names include automobile lock, bike lock, ski lock, cabinet lock, deadbolt lock, gun lock, keyin-knob lock, luggage lock, lever lock, padlock, combination lock, and patio door lock. Sometimes generic terms have overlapping meanings. A padlock, for instance, can also be a combination lock. Figure 2.1 shows a variety of padlocks.
The key-in-knob lock refers to a style of lock that is operated by inserting a key into its knob (Figures 2.2a and 2.2b). A lever lock has a lever as a handle (Figures 2.3a and 2.3b). A handle set has a built-in grip handle (Figure 2.3c). A deadbolt lock projects a deadbolt (Figures 2.4a and 2.4b). As the names imply, the automobile lock, bike lock (Figure 2.5), ski lock (Figure 2.6), patio door lock, etc., are based on the purposes for which the locks are used. Sometimes locks that share a common purpose look very different from one another. Figure 2.7 shows several styles of patio door locks.
Manufacturer’s Names
Locksmiths often refer to a lock by the name of its manufacturer, especially when all or most of the company’s locks share a common characteristic. Locks manufactured by Medeco Security Locks, Inc., for example, all have similar internal constructions. Simply by knowing a lock is a Medeco lock, a locksmith can consider the options for servicing it.
Several lock manufacturers are so popular in the locksmithing industry that every locksmith is expected to be familiar with their names and the common characteristics of each manufacturer’s locks. Those manufacturers include Arrow, Best, Corbin, Dexter, Ilco Unican, Kwikset, Master, Medeco, Russwin, Sargent, Schlage, Weiser, and Yale.
Key Types
Many times a lock is identified by the type of key used to operate it. Bit key locks and tubular key locks are two common examples. Tubular key locks, sometimes called Ace locks, are primarily used on vending machines and coin-operated washing machines (Figure 2.8). Bit key locks are used on many closet and bedroom doors. When speaking about a bit key lock, locksmiths usually use a name that reveals how it is installed.
FIGURE 2.1 Padlocks come in assorted shapes and styles for different purposes. (Courtesy of Master Lock Company)
FIGURE 2.2A A popular key-in-knob lock. (Courtesy of Master Lock Company)
Installation Method
The terms rim lock
and mortise lock
identify locks based on installation method. A rim lock, or surface-mounted lock, is designed to be installed on the surface, or rim, of a door (Figures 2.9, 2.10, and 2.11).
A mortise lock is designed to be installed in a mortise, or recess, in a door. Figure 2.12 shows a mortise bit key lock installed. Not all mortise locks are operated with a bit key; the lock in Figure 2.13 uses a cylinder key.
Internal Construction
For servicing locks, names based on their internal constructions are usually most helpful to a locksmith. Examples include warded lock, pin tumbler lock, disc tumbler lock, wafer tumbler lock, lever tumbler lock, and side bar lock.
Lock names based solely on internal construction don’t indicate the lock’s purpose, installation method, function, or appearance, but only refer to its type of cylinder or parts inside its lock case. A lock that uses a pin tumbler cylinder, for example, is called a pin tumbler lock or a pin tumbler cylinder lock. A lock with wards inside its case is called a warded lock.
Note: Some people use the terms lever lock
and lever tumbler lock
synonymously. However, the latter refers to a type of internal construction, whereas the former refers to a type of handle used (refer back to Figure 2.3).
Most types of cylinders can be used with a wide variety of locks. A key-in-knob lock, for example, can use a disc tumbler cylinder or a pin tumbler cylinder. Both cylinder types can also be used with many other types of locks. Which type of cylinder is best to use depends on the level of security needed, how much money someone is willing to spend, and whether or not the cylinder needs to fit into an existing keying system.
Lock Functions
Entrance lock, classroom lock, and vestibule lock are names based on how a lock functions. A classroom lock, for example, is one whose inside knob is always in the unlocked position for easy exiting and whose outside knob can be locked or unlocked with a key. An institution lock, however, has both knobs always in the locked position to prevent easy exiting; a key must be used on either knob to operate the lock. (Lock functions are listed in Appendix A.)
FIGURE 2.2B Diagram of a key-in-knob lock. (Courtesy of Arrow Lock Company)
FIGURE 2.3A Lever locks come in many different handle sizes. (Courtesy of Kwikset Corporation)
At this point, you should have a good idea of how locksmiths identify locks. They simply combine several applicable terms that provide the necessary specificity. Now when you hear a name like mortise bit key lock, you should better understand what it means. Don’t worry if you don’t remember all the names used for locks. The purpose of this chapter is to help you understand the logic behind some of the most commonly used names.
Types of Keys
A key is the device that operates locks. Keys come in a wide variety of shapes and sizes.
The most common keys, those typically used on homes and cars, share many common features. Usually such keys are made of metal, are 1- to 2-inches long, and have the following parts: a gripping area for turning the key; a thin blade with grooves or millings
along the blade’s length on one or both sides; and jagged U- or V-shaped cuts of varying depths spaced along one or both