Pop rivets are mechanical fasteners which provide permanent bonding between two components. The rivet is characterized by a wide head and narrow tail. The tail is fitted into holes in the component parts and extends through the rear. Some mechanical means is then used to mold the tail so that the component parts are fastened together. The rivet body is hollow with a mandrel running through to emerge at the rivet head. The mandrel forms a bulge at the rear end of the rivet. Soft material such as copper or aluminum is used to make the rivet body. The mandrel is made of tougher material such as steel. Pop rivets are characterized into three main styles and structural types.
1. Head Style Types
These consist of large flange, countersunk and dome varieties. Large flange rivets have an oversized head. This provides a wide bearing surface. The flange can be used to fasten both soft and brittle materials. The head of the countersunk flange is flat although not as wide as the large flange. The head is countersunk into the item being secured. It is convenient where it is desirable to have minimal presence of rivet heads showing. The dome rivet is the most commonly used type. The size of the head is twice that of the rivet body. It protrudes onto the surface of the item being secured. Although it provides adequate bearing surface for various applications, it is not ideal for soft or brittle material.
2. Structural Types
These consist of the open end, closed end and T-rivet types. Open end rivets have the mandrel running all through the rivet. This adds to the effectiveness of the bonding. Once the mandrel is broken, the head remains in the rivet body. Open end rivets occur in any of the three head styles previously mentioned. In applications where pressure isn’t required, open end rivets are suitable for use. Closed end rivets have their body sealed at the end into a tight seal. The sealed end resembles a cup. The mandrel head remains within the rivet once the head is broken off. Where fluid retention is required, closed end rivets work well. Closed end rivets are more durable than the open end type. These are available in dome and countersunk head styles. T-rivets have the mandrel uniquely structured. It splits the rivet body into three distinct sections. This yields a high clamping force. T-rivets are ideal for use in high stress applications even in fragile materials.
3. Grooved, Easy Entry and High Strength Rivet Types
Grooved rivets are designed to be fitted in a hole of soft, fibrous materials such as wood, cork or cardboard. Once the rivet has set, its body decreases. As the groove closes, it grasps the fibers of the material being secured. Easy entry rivets are useful in applications that involve multiple sheets of material. The rivets streamline misaligned holes to facilitate production. High strength rivets are useful where high resilience bonding is required. They have a high tensile strength as well as resistance to vibration.