How to Choose a Tungsten Bucking Bar
Match shape, weight, and reach to the job
To choose a tungsten bucking bar, match the bar’s shape, weight, and reach to your rivet location and access. Start with where you’re bucking, then narrow by shape and weight class. Here’s the five-step process.
Identify the rivet location and access
Start with where you're bucking: open flat skin, a tight corner, an edge or flange, a deep reach away from an edge, or a bottom wing skin. Access drives every other choice.
Match the bar shape to the access
Use a straight bar for flat, open work; an angled bar for corners and flanges; an offset bar for stepped or recessed structure; a hook bar to reach around edges; and a low-profile bar for thin, confined gaps.
Choose the weight class for your rivet size
Lighter bars (under 1.5 lb) suit small rivets and light gauge; medium bars (1.5–3 lb) cover general airframe work; heavy bars (3 lb and up) back larger rivets and thicker structure.
Check reach and length for the gap
Confirm the bar is long enough to reach the rivet but slim enough to fit the access. Long, thin reach bars carry mass deep into the work; compact bars fit tight pockets.
Confirm with the Selector, then request a quote
Run your inputs through the Bucking Bar Selector for a recommended SKU, then request a quote for current pricing and lead time.
Quick decision matrix
Each cell is a starting recommendation by work area and rivet size. Click a SKU for full specs and a quote, then fine-tune for access and weight feel with the Selector.
| Work area | Small rivets (3/32, light gauge) | Medium (1/8, general airframe) | Large (5/32+, heavy structure) |
|---|---|---|---|
| Flat skin & open panels |
Straight ETBB12 0.65 lb |
Straight ETBB19 1.5 lb |
Straight ETBB35 3.1 lb |
| Bottom wing skin (overhead) |
Straight ETBB12 0.65 lb |
Straight ETBB19 1.5 lb |
Straight ETBB35 3.1 lb |
| Corners, flanges & angled faces |
Angled ETBB02 1.2 lb |
Angled ETBB15 2.1 lb |
Angled ETBB41 3.25 lb |
| Around edges, channels & spars |
Hook ETBB29 1.65 lb |
Hook ETBB29 1.65 lb |
Offset ETBB25 3.15 lb |
| Shallow / limited clearance |
Low-profile ETBB39 0.6 lb |
Low-profile ETBB20 1.95 lb |
Low-profile ETBB40 3.05 lb |
Adjust from this baseline: tighter access favors a lower-profile or shorter bar, deep reach favors a longer or reach bar, and a lighter feel steps the weight class down while maximum bucking mass steps it up. Use the Bucking Bar Selector to factor in access and weight feel.
Common questions
How heavy should a bucking bar be?
Start from rivet size, not from feel. About 2 lb is the traditional starting point for 3/32 inch solid rivets, and plenty of builders run lighter, closer to 1 to 1.5 lb, in thin skin with good access. Step up for larger rivets and stiffer structure. The bucking bar weight guide walks the sizes, and the size and weight chart lists every bar by weight class.
What bucking bar shape do I need?
Access decides the shape, not preference. Flat, open skin takes a straight bar. Sloped or boxed-in work takes an angled face. Flanges and obstructions need an offset. Ribs and channels need a hook. Shallow clearance needs a low-profile bar. See bucking bar shapes explained for what each profile reaches.
Can one bucking bar do the whole job?
For a lot of a build, nearly. A compact bar around 1.5 lb handles the large majority of rivets on a typical airframe. Where one bar stops being enough is access and the size extremes: flanges and corners need a shape that reaches, and the largest rivets in stiff structure need real mass. That is why most shops keep a small set rather than one bar. See the kits.
How do I match an ATS or competitor part number?
Use the cross-reference. It maps ATS, steel, and competitor part numbers to the closest USA Tungsten bar by size and weight, so you can quote a like-for-like replacement without measuring the old bar.