Blind rivets are mainly used in applications where there is no access to the rear (blind side) of the joint. Rivets have a two piece construction; one is called the rivet body, shell, or hat and another is called the stem or mandrel. Both the hat and mandrel are pre-assembled and ready to use.
Rivets are installed by using a riveting tool to draw the mandrel which causes the body to deform and clamp down on the joint. Upon reaching the designed clamping force, the mandrel snaps and is discarded. Rivet size and grip range is measured in installed length. IFI 114 Compliant.
How to measure a Rivet: First, measure the diameter of the rivet itself with a dial caliper. Then, just like measuring a bolt, measure the underside of the rivet head to the end of the rivet head. Make sure that you do not measure to the end of the mandrel, you only want the length of the HAT and washer. The grip range of the rivet will be 1/8" shorter than the measured length. EXAMPLE: If the length of the hat is 1/2" the rivet is actually a 3/8" grip (.375), also known as a 4-6 rivet. Please refer to the diagram and charts below for grip ranges, grades, etc.
Grip range is not the same as length, the rivet must expand or swell out on the backside in order to hold the rivet together.