## Do O-rings come in metric sizes?

Thousands of common metric o-rings and non-standard o-rings in metric sizes are available in stock. Custom o-rings are available upon request and can typically be produced within a few weeks with no tooling fees.

## What are standard o-ring sizes?

The standard sizes are also used for most military specifications. Cross-sectional diameters range from 0.040 to 0.275 inch. Inside diameters range from 0.029 to 25.940 inches.

What size is an o-ring in MM?

O-Ring size is defined by inside diameter and cross-section (width) and is listed in both fractional and decimal dimensions with tolerances. The standards range in I.D.’s from . 74 mm to 658.88 mm and cross sections (widths) from 1.02 mm to 6.99 mm.

### What’s the difference between metric and imperial O-rings?

Metric O-rings have temperature ranges given in degrees Celsius. Imperial O-rings have operating temperature ranges given in degrees Fahrenheit.

### Are O-rings sized by ID or OD?

The best way to size an o-ring is by measuring the CS (cross-section) and ID (inside diameter). For measuring the cross-section, it is best to use a caliper, a.k.a. micrometer. If you don’t have one available, various other sizing tools can be used to get a close estimate.

How do you choose an O-ring diameter?

O-Ring Size The size of an O-ring can be determined by measuring the diameters and the width of the cross-section. The measurement you will need to include are the internal diameter (ID), outside diameter (OD), and the cross-section width (CS).

## How do you size a rubber O-ring?

How to Measure O-Rings

1. Place the O-ring on a clean, flat, level surface.
2. Determine the inside diameter by using a ruler to measure from one inner edge to another.
3. Use a ruler to measure the diameter, from one outer corner of the O-ring to the other outer corner.
4. Finally, measure the cross-section.

## What is the difference between nitrile and Buna O-rings?

High Nitrile content within the polymer provides higher resistance to oils but lowers its flexibility. In other words, Buna offers superior strength and is more resistant than natural rubber to oils and acids, however, its flexibility is limited.

How do you size a ring?

Measure your ring size with these steps:

1. Wrap string or paper around the base of your finger.
2. Mark the point where the ends meet with a pen.
3. Measure the string or paper with a ruler (mm).
4. Pick the closest measurement on the ring size chart to find your ring size.