Seeflex 040E vs. Seeflex 020E: Choosing the Right BFM^® Flexible Connector

When it comes to BFM® flexible connectors, Seeflex 040E stands out as the most popular and widely used option. With over 16 different BFM® sleeve connector types available, the Seeflex 040E is considered the industry standard due to its strength, durability, and versatility. However, Seeflex 020E is another top-performing sleeve that shares many of the same features. So how do you know which BFM® fitting is right for your application?

In this post, we compare Seeflex 040E vs. Seeflex 020E, helping you determine the best option based on your specific installation needs.

Similar But Not Identical: Understanding the Key Differences

At first glance, Seeflex 040E and 020E appear quite similar. Both BFM® connectors:

• Feature a smooth, glossy finish

• Offer zero air permeability

• Have a surface resistance of 10¹⁰ ohms

• Provide excellent chemical resistance for CIP and washdown environments

• Are highly durable with no memory—ideal for repeated flexing without cracking

But despite these similarities, key differences in thickness, flexibility, and temperature resistance affect their ideal use cases.

What Does “040E” or “020E” Mean?

The number in the Seeflex product name refers to the wall thickness:

• Seeflex 040E: 0.9 mm thick (1/32″)

• Seeflex 020E: 0.35 mm thick (1/64″)

This difference in thickness significantly impacts performance and application suitability.

When to Use Seeflex 020E

Seeflex 020E is lighter and more flexible, making it the best choice for:

• Weigh-scale applications

• Load cells

• Frequent or high-movement environments

• Installations requiring minimal weight and maximum responsiveness

However, due to its thinner structure, Seeflex 020E may wear faster and has a lower pressure rating compared to the 040E.

When to Use Seeflex 040E

Seeflex 040E is more robust and ideal for:

• General-purpose static installations

• Environments with higher pressure or temperature surges

• Applications requiring a long-lasting, durable connector

It provides an excellent balance of strength and chemical resistance for most industrial processing systems.

Seeflex 040E vs. 020E – Performance Comparison

As shown in the table, each sleeve offers unique mechanical properties that should be considered during connector selection.

How to Choose the Right BFM® Connector

Choosing between Seeflex 040E and 020E depends on factors such as:

• Flexibility needs

• Temperature exposure

• Weight sensitivity

• Movement frequency

• Pressure rating requirements

For personalized guidance, our team is here to help.

Need Help Selecting the Right Sleeve?

If you’re unsure which BFM® fitting is best for your application, contact us today & fill out the form here. Our experts can guide you through the selection process and ensure you choose the most suitable flexible connector for your system.