Instructor: Bill Deahl

Class Objective – The student will learn to:

1. Understand the history and development of Small Format Interchangeable Core (SFIC) systems.
2. Identify the components and design of SFIC cylinders and cores.
3. Learn the principles and mathematics behind SFIC keying systems.
4. Understand the applications and advantages of interchangeable core systems.
5. Perform proper pinning and capping procedures for SFIC cylinders.
6. Gain a working knowledge of the A2 pinning system used throughout the industry.
7. Become familiar with the A3 and A4 pinning systems and understand their differences from A2.
8. Develop the skills necessary to service, maintain, and troubleshoot SFIC systems.

Course Description

Small Format Interchangeable Core (SFIC) systems are widely used in commercial, institutional, educational, and government facilities because they provide exceptional flexibility, security, and ease of maintenance.

This course provides a comprehensive introduction to SFIC design, history, applications, and servicing. Students will learn the mathematical concepts that make interchangeable core systems function, along with proper pinning, capping, and servicing procedures. Special emphasis will be placed on the A2 Pinning System, the industry standard for most SFIC applications, while also introducing the A3 and A4 systems and discussing where they are commonly used.

Whether you are new to interchangeable cores or looking to strengthen your existing knowledge, this course provides the practical foundation needed to confidently work with SFIC hardware.

What You’ll Learn

• History and evolution of SFIC systems
• SFIC cylinder and core design
• Applications for interchangeable core hardware
• Core mathematics and keying concepts
• Pinning procedures
• Capping procedures
• A2 pinning system fundamentals
• Introduction to A3 and A4 pinning systems
• Common servicing techniques and best practices

Who Should Attend

• Commercial locksmiths
• Institutional locksmiths
• Government locksmiths
• Apprentice locksmiths
• Door hardware technicians
• Anyone interested in interchangeable core systems

What to Bring

• Notebook or legal pad
• Pens or pencils
• Calculator (recommended)

Upon Completion

Students will have a solid understanding of Small Format Interchangeable Core systems, including their design, applications, mathematics, and servicing procedures. Participants will leave with the knowledge and confidence to pin, cap, maintain, and troubleshoot SFIC cylinders while understanding the differences between the A2, A3, and A4 pinning systems.