Selecting the right selective pallet racking system goes beyond load capacity and dimensions. One of the most critical — and often overlooked — components is the upright punching pattern (also called slot pattern or perforation style).

Different manufacturers use unique upright profiles and hole patterns, which directly impact beam compatibility, adjustability, and system safety.

This guide from Mecarack USA will help you identify the most common upright punching styles used across the industry.

Why Upright Punching Patterns Matter

Upright punching patterns determine how beams connect to the frame. Choosing the wrong beam for a specific pattern can lead to:

• Improper fit or unsafe connections
• Reduced load capacity
• Installation issues
• Compatibility limitations when mixing brands

Understanding these differences helps ensure your system is safe, efficient, and scalable.

Teardrop Style (Most Common in the U.S.): As the most widely used punching pattern in North America.

Characteristics:

• Oval-shaped holes resembling a teardrop
• Typically spaced every 2 inches vertically
• Compatible across multiple brands

Advantages:

• High interchangeability between manufacturers
• Easy installation and beam adjustment
• Widely available components

Other common upright hole patterns include Keystone, Structural, Teardrop New Style (Mecalux), Penco, Ridg-U-Rak, T-Bolt, and Speedrack.

Use the image below as a quick reference to identify your frame type and easily match compatible components.

Can You Mix Different Rack Systems?

In general, mixing components from different manufacturers is not recommended unless compatibility is verified.

Even if two systems look similar:

• Beam connectors may not lock properly
• Load ratings may differ
• Safety could be compromised

Best practice: Always consult a professional before combining rack components.

How Mecarack USA Can Help

At Mecarack USA, we help customers:

• Identify existing rack systems
• Match compatible beams and components
• Upgrade or expand current installations
• Design new systems based on your needs

Whether you are working with new or used pallet racking, we ensure your system is safe, efficient, and compliant.

Need Help Identifying Your Rack System?

Send us a photo of your upright frame and we’ll help you identify the punching pattern and compatible components.