These rivets were thick iron plugs with mushroom-shaped heads that were heated until they were red-hot and placed into holes in the steel. While one worker applied pressure to the head, another worker then peened over the tail protruding from the steel with a manual or pneumatic hammer.
Common Types of Rivets
These days, the rivet you will most likely encounter is a smaller, lighter-duty version called a blind or “pop” rivet. (“Pop rivet” is actually a genericized term for the Stanley Engineered Fastening’s POP brand rivets.) Pop rivets are used to join two pieces of thin material, such as plastic or aluminum, from one side, eliminating the need to access the back of the workpiece. Around the house, they are most typically used to join sections of gutters and downspout fittings. Made of a soft metal, usually aluminum or copper, a pop rivet consists of a small nail, called a mandrel, inserted into a tube.
How to Install a Pop Rivet
After the two sections to be riveted are aligned, a hole that’s the diameter of the rivet is drilled through the layers to be joined. The rivet is inserted into the hole and, using a rivet gun the mandrel is withdrawn through the tube. As the mandrel is withdrawn, it causes the tube to swell, locking the two pieces together. The mandrel then breaks off at a predetermined weak spot, leaving the rivet flush with the surface of the material. As involved as that sounds, the whole procedure takes less than a couple of seconds.
Steps for Removing Rivets
Occasionally, you’ll need to reverse the procedure and remove the rivet. For instance, when replacing sections of gutter or downspouts, you may need to remove rivets to disassemble the parts. There are a few methods to remove a rivet.
Option 1: Drill it Out With a Dedicated Tool
The cleanest method is to drill it out. If you have a lot of rivet removals in your future—let’s say you’re restoring an Airstream trailer or an old Cessna—you might consider buying a dedicated rivet removal tool.
Typically used by aircraft mechanics, the tool consists of a drill bit and guide that positions the bit over the center of the rivet. Insert the tool into a drill, position the guide onto the rivet head, and drill the head off and the rivet out.
Option 2: Drill it Out with Basic Tools
If you’re only removing a few rivets, a more accessible method is to use a plain drill bit.
First, if the rivet doesn’t have a discernible center, you’ll have to create a divot, a place for the drill to start, using a hammer and a center punch or narrow nail set. Next, find a twist drill bit that’s just the next size larger than the rivet’s mandrel. Insert the bit into the drill, center the bit in the hole, and drill at a slow speed through the center of the rivet’s sleeve. The rivet should fall apart. If it doesn’t, try the next larger-size drill bit. Remember, it’s always a good idea to wear safety glasses when drilling into metal.
Option 3: Use Brute Force
A third method is crude, but it works. (This is probably not the method of choice if you value the appearance of the object that’s riveted; this procedure can mar the surface.)
Find a cold chisel or a similarly blunt-edged tool (a slot-head screwdriver works just fine), place the sharp end of the tool against the rivet head’s edge then hit the other end of the tool with a hammer. Repeat until the rivet head is detached. Usually, the rivet can then be easily removed. Occasionally, a punch may be required to push the rivet out.
