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A nut-plate riveter which includes multiple pistons which assist in creating a pulling force. The nut-plate riveter provides that spent mandrels are pulled through the tool, thereby avoiding problems in the field. The nut-plate riveter includes a handle and a plurality of pistons disposed in the han

A nut-plate riveter which includes multiple pistons which assist in creating a pulling force. The nut-plate riveter provides that spent mandrels are pulled through the tool, thereby avoiding problems in the field. The nut-plate riveter includes a handle and a plurality of pistons disposed in the handle. Cavities are proximate the pistons for pressurizing the pistons, and air supply passages are in communication with the cavities for supplying air to the cavities to pressurize the pistons. A piston rod is engaged with at least one of the pistons, and the piston rod has a longitudinal bore therethrough which is configured to receive a spent mandrel. A deflector fitting may be disposed at an end of the nut-plate riveter.

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1. A riveter comprising: a handle; a plurality of pistons disposed in the handle; cavities proximate the pistons for pressurizing the pistons; air supply passages in communication with the cavities for supplying air to the cavities to pressurize the pistons; and a piston rod threadably engaged with

1. A riveter comprising: a handle; a plurality of pistons disposed in the handle; cavities proximate the pistons for pressurizing the pistons; air supply passages in communication with the cavities for supplying air to the cavities to pressurize the pistons; and a piston rod threadably engaged with at least one of the pistons such that an air passage is provided at the engagement whereby air can pass between the piston rod and the piston, said piston rod providing at least one orifice for allowing passage of air between the piston rod and the cavities and having a longitudinal bore therethrough configured to receive a spent mandrel.2. A riveter as recited in claim 1, wherein the plurality of pistons disposed in the handle comprises a front piston and a rear piston, wherein the piston rod extends through the front piston and is securably engaged with the rear piston.3. A riveter as recited in claim 1, wherein the plurality of pistons disposed in the handle comprises three pistons.4. A riveter as recited in claim 1, further comprising a deflector fitting disposed at an end of the nut-plate riveter.5. A riveter as recited in claim 1, wherein the piston rod is cylindrical and includes orifices which are configured to allow the passage of air.6. A riveter as recited in claim 1, further comprising a bulkhead which engages an exterior surface of one of the pistons and contacts a wall in the handle.7. A riveter as recited in claim 1, further comprising a trigger on the handle for actuating the nut-plate riveter.8. A riveter as recited in claim 1, further comprising a front cap sub-assembly comprising a front cap and a bumper member disposed in the front cap, wherein an end of said handle is configured to receive the front cap sub-assembly.9. A riveter as recited in claim 8, wherein the front cap threadably engages the end of the handle.10. A riveter as recited in claim 1, further comprising a pulling head which is engaged with said piston rod.11. A riveter as recited in claim 10, wherein said pulling head comprises a nose fitting, a sleeve and a drawbar, said sleeve being threadably engaged with said nose fitting, said drawbar being disposed in said sleeve and threadably engaged with said piston rod.12. A riveter as recited in claim 11, wherein said pulling head further comprises a jaw follower sub-assembly and a jaw set, said jaw follower sub-assembly being disposed in the drawbar and contactably engaged with said jaw set.13. A riveter as recited in claim 12, wherein said pulling head further comprises a follower spring, said jaw follower sub-assembly engaged with said follower spring, said follower spring being engaged with an interior surface of the piston rod.