The ETBB27 is an offset tungsten bucking bar, stepped so you can clear a lip or edge and still seat flat against the rivet tail. It measures 2.438 inches long by 1.25 inches wide by 1.5 inches thick and weighs 2.3 lbs. It is a versatile everyday size for general airframe and sheet metal riveting.

Tungsten’s high density concentrates the backing mass, so the bar pushes back on the rivet gun like something larger. 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.

This bar is produced in the USA from dense tungsten alloy and hand finished so the faces will not scuff your workpiece. 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 matching product page with every dimension, and the full size and weight chart can help you compare it against other sizes and shapes.

Frequently asked questions

What jobs is the ETBB27 bucking bar best for?

It is an offset bar at 2.3 lbs and 2.438 by 1.25 by 1.5 inches. It is a versatile everyday size for general airframe and sheet metal riveting.

How is a tungsten bucking bar better than steel?

Tungsten's high density concentrates the backing mass, so the bar pushes back on the rivet gun like something larger. You get the backing mass you need without a heavy, bulky steel bar to wrestle.

Is the ETBB27 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.