The ETBB37 is a hook tungsten bucking bar that lets you curl in behind a flange or into a channel for solid backing. It measures 5 inches long by 1.5 inches wide by 1.5 inches thick and weighs 5.75 lbs. This is a high-mass bar for the biggest solid rivets and structural backing where you want maximum inertia.

Because tungsten is far denser than steel, it delivers the rebound mass of a steel bar well beyond its size. In a cramped bay that means less bar to hold and position, a steadier rebound behind the rivet set, and less hand and wrist fatigue over a long session.

It is machined in the USA from high density tungsten alloy and dressed so the working faces stay smooth against aluminum. It is a dependable pick for aircraft assembly and repair, restoration and experimental builds, and any solid rivet work where control and access matter.

To be sure this is the right bar for your rivet pattern, USA Tungsten publishes the complete spec sheet for this size, and the full size and weight chart can help you compare it against other sizes and shapes.

Frequently asked questions

What jobs is the ETBB37 bucking bar best for?

It is a hook bar at 5.75 lbs and 5 by 1.5 by 1.5 inches. This is a high-mass bar for the biggest solid rivets and structural backing where you want maximum inertia.

How is a tungsten bucking bar better than steel?

Because tungsten is far denser than steel, it delivers the rebound mass of a steel bar well beyond its size. You get the backing mass you need without a heavy, bulky steel bar to wrestle.

Is the ETBB37 made in the USA?

Yes. It is machined in the United States from high density tungsten alloy and finished so the working faces will not scuff aluminum skin.