What is Difference between DIN and ISO?

Difference between DIN and ISO?

Why is there such a big difference between DIN and ISO? How can tell the difference between them? How do you install DIN flat sheets on an ISO hex screw? Read on to find out!

Hex nuts hex washers have standard threading. They are measured in inches and are used primarily for threading hardware installed on one or both sides of a bolt and usually have a head capped by a hex nut. DIN flat sheets are mainly used for interior mounting, measured in diameter, and fastening equipment, like knobs and handles.


The next difference is regarding the surface materials that are used for DIN sheets. DIN flat sheets are manufactured using various materials, including brass, steel, stainless steel, aluminum, brass, and nickel alloys. ISO-standard equipment is made from materials similar to stainless steel, but are coated with another metal, often chromium or zinc, to provide a non-corrosive surface. The standard for DIN 934 is almost identical to the metric measurement for threading diameter.

How about Bolt Diameter?

The diameter of bolts is measured in millimeters. Bolts are typically sized by how large the hole you want to use will be when seated. For example, a five-millimeter bolt will install two millimeters of hose. This means that the larger the diameter of the hole, the smaller the bolt needs to be to keep the hose secure. DIN and ISO standards allow for smaller bolts that can seat comfortably without the need to compromise the quality of your installation.

Differences between DIN & ISO?

There are not any significant differences. Both use DIN letters to identify their measurements, with the ISO designation being slightly more formal than DIN. However, there are some minor variations between DIN and ISO measurements. For example, while most bolts with ISO designation are standardized, not all of them are.

For Example,

While all bolts with DIN lettering are the same size, the diameter of the hole they sit into may differ between the two measurements. For example, if you have a bolt three inches long and seats six millimeters into your hoses, it is still between a DIN-sized bolt and one with ISO lettering. This measurement only becomes a significant difference when installing something that will go in very close to the center of your bike’s rear wheel.
ISO measurements refer to the diameter of the threads on a bolt. The number of lines is determined by what type of nut you are using. For example, you can have a thread count as high as ten hundred and forty but only have a DIN-sized bolt that is one hundred and eighty-five millimeters in diameter.

Diameter of Bolt’s Threads

So, what is the difference between DIN and ISO? ISO refers to the quality of construction, while DIN identifies the diameter of a bolt’s threads. It would help if you always went with a bolt that has the best quality of both qualities. After all, bolts are what hold your tires to the ground, so the last thing you want is a poorly constructed bolt that can strip your tires. Keep this in mind the next time you head out for a ride!

Last Question:

The last question is, “What is the difference between DIN and ISO?”. To answer this question, you need to know how the two sizes are identified. If you look at an ISO chart, you will see that the top line is the size of the thread, while the bottom line is the diameter of the bolt. This is a general rule. However, the bolt size will not change regardless of what size thread it is. An ISO chart shows the standard size for the respective series of bikes intended.

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