Instructor: Takoda Hulen

Class Objective – The student will learn to:

1. Understand the fundamentals of Corbin Russwin and Sargent Large Format Interchangeable Core (LFIC) systems.
2. Identify the components and operation of LFIC cylinders.
3. Learn proper pinning procedures for Corbin Russwin and Sargent LFIC cores.
4. Understand the mathematics behind LFIC keying systems and how to apply them correctly.
5. Learn proper key cutting techniques for LFIC keys.
6. Recognize common pinning and keying errors and how to avoid them.
7. Develop confidence in servicing, troubleshooting, and maintaining LFIC systems.
8. Apply best practices for working with Corbin Russwin and Sargent interchangeable core products.

Course Description

This comprehensive course provides locksmiths with a practical understanding of Corbin Russwin and Sargent Large Format Interchangeable Core (LFIC) systems. From basic pinning to precision key cutting, students will gain the knowledge needed to confidently service these widely used commercial locking systems.

One of the most challenging aspects of LFIC systems is understanding the mathematics behind proper pinning and key generation. This course breaks those concepts down into easy-to-understand principles, helping students develop the confidence to work with Corbin Russwin and Sargent LFIC systems accurately and efficiently.

What You’ll Learn

• Introduction to Corbin Russwin and Sargent LFIC systems
• LFIC cylinder components and operation
• Pinning procedures and best practices
• Key cutting techniques
• Understanding LFIC mathematics and calculations
• Troubleshooting common problems
• Rekeying and servicing LFIC cylinders
• Professional tips for improving speed and accuracy

Who Should Attend

• Beginning commercial locksmiths
• Commercial locksmiths expanding into LFIC systems
• Institutional locksmiths
• Locksmith apprentices
• Experienced locksmiths looking to strengthen their understanding of LFIC mathematics

What to Bring

• Notebook or legal pad
• Pens or pencils
• Calculator (recommended)
• Pinning kit (optional, if requested by the instructor)

Upon Completion

Students will leave with a strong foundation in Corbin Russwin and Sargent LFIC systems, including the confidence to pin cylinders, cut keys, understand the required mathematics, and service interchangeable core systems more efficiently in the field.