Inserts and Fasteners




To provide fastening points in composite and aluminum honeycomb paneling, we use potted inserts. This is done by first drilling a hole in the panel and creating a cavity by routing the core back from the hole. An insert is placed in the cavity, and it is secured in place using an adhesive. Our shop can produce machined inserts in numerous types, sizes, threads and materials. Rivnuts are similar to potted inserts, but there are some key differences. Unlike potted inserts, they do not require adhesive. The are installed using a special tool that mushrooms the end of the nut to secure it to the panel. They are a more cost-effective option, and they are ideal for non-structural applications where high strength is not necessary. Helicoil inserts are also available. They are installed in a panel to strengthen drilled threads. This makes it possible to insert and remove bolts and screws countless times without causing wear. To install a helicoil, a solid aluminum block is first placed inside the honeycomb. This creates a solid point where the hole can be placed. Once the hole is drilled, the stainless steel helicoil is installed with the desired threading. For inserts that are only visible on one side, choose blind inserts with tabs. To create a hole that goes all the way through the panel while remaining flush on either side, choose spool inserts. Flatiron Panel Products is home to a full machine shop, which makes it possible to machine custom parts like inserts on demand without the need to wait for parts to arrive. The on-site machine shop also makes it possible to create virtually any type of insert imaginable.