---
title: What Is the Difference Between DIN Flange and PN Flange?
date: 2025-06-27T01:12:17Z
modified: 2025-06-27T01:12:19Z
permalink: "https://www.longanflange.com/blog/what-is-the-difference-between-din-flange-and-pn-flange/"
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categories:
  - Blog
featured_image: "https://www.longanflange.com/wp-content/uploads/2025/06/industrial-flanges-4.webp"
timestamp: 2025-06-27T01:12:19Z
tags:
  - Blog
---

If you’ve come across “DIN” and “PN” on flange specifications, you’re not alone—these terms are sometimes used interchangeably, which can confuse even experienced professionals.

In reality, they refer to different things: one is a standard series (DIN), and the other is a pressure rating (PN). This article will clarify their roles and guide your B2B decisions.

## **Understanding DIN Flanges**

**DIN flanges** refer to flange types made following the **DIN or EN 1092-1** standard, originally defined by Germany’s standard body, DIN (Deutsches Institut für Normung). Today, DIN standards have been harmonized with EN norms to provide global compatibility.

DIN-style flanges are available in versions like weld-neck (Type 11), blind (Type 05), slip-on, threaded, and flat-face configurations—all dimensioned in millimeters and matched to PN pressure classes. When you see a flange labeled “DIN PN16 DN100,” it means the flange is built to metric EN specs and designed to handle 16 bar pressure on a 100 mm bore.

## **What PN Means in Flanges**

The **PN** number stands for “Pressure Nominal,” indicating how much pressure the flange can resist at 20 °C, measured in bar. PN ratings commonly include PN6, PN10, PN16, PN25, PN40, PN64, and PN100.

Unlike DIN, **PN is not a standard**, but a classification used alongside DIN and EN specs. It appears on ANSI and DIN flanges alike. Selecting the correct PN ensures your flange will withstand real‑world system pressures.

## **How DIN and PN Work Together—and Differ**

It’s common to see both **DIN** and **PN** listed on a flange label, but they represent different parts of the specification. Understanding the role each one plays will help you choose correctly and avoid compatibility issues.

- **DIN** defines the specifications for a flange’s shape—covering details like face size, bolt-hole spacing, thickness, and hub design. Flanges made to DIN (now aligned with EN 1092-1) follow consistent dimensions, no matter the manufacturer.
- **PN** mean Pressure Nominal. What does it mean? It means the maximum pressure a flange is rated to handle a temperature of around 20 °C. For instance, a PN16 flange is rated for 16 bar.

In short, DIN defines how the flange is made, and PN defines how much pressure it can handle. You’ll often see them used together—such as “DIN PN40 DN100”—which means the flange follows DIN dimensions, fits 100 mm pipe, and can handle up to 40 bar.

It’s important to remember: PN can apply to more than just DIN flanges. Some modern flanges use DIN-style dimensions but follow [ASME ](https://www.longanflange.com/wp-content/uploads/wp-mfa-exports/page/asme-flange.md)pressure ratings or hybrid standards. Always verify both before placing an order.

## **What Is the Difference Between DIN Flange and PN Flange: Conclusion**

To clarify: a **DIN flange** is a flange made to European metric standards, describing its dimensions and construction. **PN** is the working-pressure classification that tells you what pressures it handles at ambient temperature. Both labels work together—DIN for form, PN for function. Always specify both to ensure your system is built to the correct standards.

Need help selecting the right flange combination?[ Longan Flange](https://www.longanflange.com/wp-content/uploads/wp-mfa-exports/page/about.md) supplies [DIN and ASME stainless and ASME flanges ](https://www.longanflange.com/wp-content/uploads/wp-mfa-exports/page/stainless-steel-flange.md)with PN-rated markings. [Get in touch](https://www.longanflange.com/wp-content/uploads/wp-mfa-exports/page/contact.md) with us and let us know your project specs so we can help!