If you are talking about a fastener, it is 2" diameter, 16 threads per inch. This is considered an extra fine thread fastener.

Another word for a fastener is a snap. A collar fastener is a fastener or snap that is used on a collar.

A snap fastener is a fastener used on clothing. Usually this type of fastener makes a 'snap' noise when it is fastened. Another word for 'snap fastener' would be 'press stud'.

The amount a you can tighten a fastener with out a tool.

This is about 2 Nm

In China national conditions, fastener association is powerful and helpful for foreign fastener companies. Taking part in International Fastener Show is a quick way to look for fastener companies and build up business relationship. It is held by China Fastener Industry Association. There are more than 700 fastener companies and 25,000 visitors in fastener industry around the world.