The ETBB36 is a straight-bar tungsten bucking bar built for flat skin and open, unobstructed rivet lines. It measures 3.1 inches long by 1 inch wide by 1 inch thick and weighs 2.05 lbs. It is a versatile everyday size for general airframe and sheet metal riveting.

Tungsten alloy runs about two and a half times denser than steel, so this bar backs a rivet like a much larger steel tool of the same shape. 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.

Every bar is machined in the United States from high density tungsten and finished smooth so it will not mar the surrounding skin. 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 full specifications for this exact bar, and the guide to bucking bar shapes can help you compare it against other sizes and shapes.

Frequently asked questions

What jobs is the ETBB36 bucking bar best for?

It is a straight bar at 2.05 lbs and 3.1 by 1 by 1 inches. It is a versatile everyday size for general airframe and sheet metal riveting.

How is a tungsten bucking bar better than steel?

Tungsten alloy runs about two and a half times denser than steel, so this bar backs a rivet like a much larger steel tool of the same shape. You get the backing mass you need without a heavy, bulky steel bar to wrestle.

Is the ETBB36 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.