Bucking Bar Shapes Explained
Straight, angled, offset, hook, and low-profile
Bucking bar shapes, straight, angled, offset, hook, and low-profile, and which access each is built for.
Bucking bars come in a handful of standard shapes, and the right one is set by access rather than by preference. Straight bars back open, flat work; angled, offset, and hook bars reach the rivet where a flat block cannot sit square; and low-profile bars slip into thin, confined gaps. Pick the shape that lets you hold the bar flat against the rivet tail.
Straight bars
A straight bar is a square, parallel-faced block for flat skin and open structure. It is the workhorse for long rivet lines on wing and fuselage skins where there is room to hold the bar square. Most kits lean on a mid-weight straight bar for the bulk of the work. Browse straight bucking bars.
Angled bars
An angled bar has a beveled or angled face so it can sit flat against a rivet in a corner, on a flange, or on sloped structure where a square block would tip. Reach for an angled bar at lightening-hole flanges and intersecting structure. Browse angled bucking bars.
Offset bars
An offset bar steps its working face away from the body of the bar, so it can back a rivet in stepped or recessed structure while the bar clears an obstruction. Browse offset bucking bars.
Hook bars
A hook bar reaches around an edge or a flange to put mass behind a rivet a straight bar cannot get to, such as a closed or boxed section with a lip. Browse hook bucking bars.
Low-profile bars
A low-profile bar is thin, about 0.5 in or less, for shallow bottom-skin areas and confined gaps where thickness is the limit. It still carries enough mass to back the rivet while fitting where a taller bar will not. Browse low-profile bucking bars.
Matching shape to the job
Shape handles access; weight handles rivet size. Once the shape fits the access, set the weight from the weight guide, and if you are replacing a competitor bar, check the cross-reference. The fastest path is the Bucking Bar Selector, which maps your rivet location to a shape and a SKU.
Common questions
What are the types of bucking bars?
The standard shapes are straight (flat, open work), angled (corners and flanges), offset (stepped or recessed structure), hook (reaching around an edge), and low-profile (thin, confined gaps). The shape is chosen by how you access the back of the rivet.
How do I know which bucking bar shape I need?
Look at how you reach the rivet tail. Open and flat means a straight bar; a corner or flange means angled; a step or recess means offset; an edge to reach around means hook; a thin gap means low-profile. The Bucking Bar Selector recommends a shape from your access.
What is a low-profile bucking bar for?
A low-profile bar is about 0.5 in or less thick, for shallow bottom-skin areas and confined gaps where a taller bar will not fit while still backing the rivet with enough mass.