The largest portion of the business is in the Rotor Wing Industry. Bertrand Products is an approved supplier to manufacture “Flight Critical" and "Flight Safety" components and assemblies and a supplier of tail rotor driveshaft assemblies, transmission components and assemblies, and a variety of engine mounts. Bertrand holds the approval to manufacture a Torsion Tension Straps that fit several manufacture models.

Bertrand Products offers their customers the ability to work on projects from the development stage to production. The company has a prototype department with hands-on engineering, from building fixture for manufacturing, writing programs and running the 1st piece prior to the production floor, and developing manufactures process for production. This process enables Bertrand to schedule their production floor more efficiently to meet schedule deliveries.