When choosing the right blind rivet size for the job, there are multiple specifications that you have to consider, this article will be divided into 2 parts, in the first part will show you the sized you need when choose the blind rivet:

Hole size – Blind rivets are installed in pre-drilled holes, and you want to be sure that the rivet diameter matches the hole for a snug fit. If the rivet is too small, the joint may loosen or the gap between the rivet and the sides of the hole might allow the blind head to expand in the space between the two workpieces. If the fit is too tight, it is difficult to properly place the rivet. Blind rivet sizes range from micro rivets on up and are available in both standard and metric units.

Grip range – The grip range is based on the length of the rivet and needs to match the grip, which is the thickness of the materials being joined. Most rivets have a grip range from a minimum to a maximum thickness that will provide an optimal joint. If the rivet is too long, the blind head won’t bind tightly to the blind side of the material; too short, and the head may not form on the blind side at all.

Primary rivet head shape and size – The primary rivet head size on the visible side of the joint will vary based on the application. The head needs to be sufficiently wide that it won’t pull through. For example, you can use small heads for hard materials such as steel, but may need a broader head size for softer materials such as plastic. The shape of the head also will affect the grip and the look. There are domed rivet heads that provide a good grip and countersunk heads that lie flush with the material but may need to be wider to guarantee against pull-through. There are a variety of blind rivet heads, each useful for different applications.

Mandrel head size – Just as the primary head has to be sized for the job, so does the mandrel head on the blind side. Once set, the bulbed head formed on the blind side should create a flange wide enough to provide a strong hold and relatively flush with the workpiece. Soft materials such as plastics will require larger flange heads.