A surgical instrument (500) including a handle portion (510), a body portion (512), a movable handle (516), and a disposable loading unit ("DLU" 16) including a tool assembly (17), a drive beam and a closure apparatus is disclosed. At least one of the closure apparatus and a contact surface of the tool assembly (17) include a plastic surface. The body portion (512) extends distally from the handle portion (510). The movable handle (516) is located on the handle portion (510) and is in mechanical cooperation with a drive member. The tool assembly (17) includes an anvil, a cartridge assembly and a contact surface. The drive beam includes a proximal engagement portion and is configured to engage a portion of the drive member. The closure apparatus is configured to engage the contact surface of the tool assembly. At least a partial actuation of the movable handle moves the closure apparatus distally into engagement with the contact surface to approximate the anvil and the cartridge assembly.
