The ETBB28 is a low-profile tungsten bucking bar for tight clearances where a thick bar simply will not fit. It measures 4 inches long by 1.625 inches wide by 0.938 inches thick and weighs 3.15 lbs. The extra mass makes it well suited to larger rivets and jobs that need a firm, stable backing.

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 why tungsten beats steel for bucking can help you compare it against other sizes and shapes.

Frequently asked questions

What jobs is the ETBB28 bucking bar best for?

It is a low-profile bar at 3.15 lbs and 4 by 1.625 by 0.938 inches. The extra mass makes it well suited to larger rivets and jobs that need a firm, stable backing.

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 ETBB28 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.