The Application of Bucking Bars

Bucking bars are tools used to form bucktails (thehead formed during riveting operations) on rivets.They come in many different shapes and sizes, asshown in the following picture.

Bucking bars are normallymade from an alloy steel similar to tool steel. Theparticular shape to be used depends upon the locationand accessibility of the rivet to be driven. The size and weight of the bar depend on the size and alloy ofthe rivet to be driven. Under certain circumstances,and for specific rivet installations, specially designedbucking bars are manufactured locally. These barsare normally made from tool steel. The portion of thebar designed to come in contact with the rivet has apolished finish.This helps to prevent marring offormed bucktails. Bucking-bar faces must be keptsmooth and perfectly flat and the edges and cornersrounded.

NOTE: Never hold a bucking bar in a viseunless the vise jaws are equipped withprotective covers to prevent marring of thebucking bar.

A satisfactory rivet installation depends largelyon the condition of the bucking bar and your ability touse it.If possible, hold the bucking bar in such amanner that will allow the longest portion of the bar tobe in line with the rivet. You should hold the buckingbar lightly but firmly against the end of the rivet shankso as not to unseat the rivet head. The inertia of thistool provides the force that bucks (upsets) the rivetand forms a flat, headlike bucktail.




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