Tungsten bucking bars are included in powerful tools such as riveting guns in order to reduce vibration.

Employees using this equipment can suffer from industrial diseases such as vibration white finger and carpal tunnel syndrome. These conditions affect the bones, muscles and nerves in the hands, potentially leaving staff unable to work.

Therefore, these bucking bars can play a vital role in maintaining staff wellbeing, as well as preventing your company from having to deal with potentially costly compensation claims from injured workers.




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Bucking bar is a work tool received behind work surfaces to provide a backing member in applying impact fasteners and including intermitted toolhead and handle parts with a low-recoil impact-absorbing spacer provided there between to take shock loads in compression and shear.

Bucking bars are used on the backside of a metal rivet to counter the force of the hammering on the other side. They also can be used to absorb the force of rivet guns, reducing the vibration of bucking.

Bucking bars used to form bucktails on rivets. And come in many different shapes and sizes. They are normally made from an alloy steel similar to tool steel. The particular shape to be used depends upon the location and accessibility of the rivet to be driven.

The size and weight of the bar depend on the size and alloy of the rivet to be driven. Under certain circumstances, and for specific rivet installations, specially designed bucking bars are manufactured locally.




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A hard rubber grommet is placed over the buck tail of the rivet. The grommet should be slightly thicker than the length of the buck tail.  As the bucking bar is compressed against the tail during riveting the rubber squeezes the components together until the rivet expands enough to secure them permanently. This is a useful technique when clecoes or clamps are impractical.




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If possible, skins should be back riveted. This process provides cosmetic (and some structural) protection to the outer skin. Some locations will permit access for use of the spring loaded (type I) back riveting set. On others, such as wing ribs, a special long back set having an angled face is used to back set rivets. In either case, a partner uses a polished, 3" diameter back riveting bar (plate) to buck rivet heads from the outer side of the skin.

The Swivel flush set mentioned above is a must when selecting aircraft riveting tools. Unlike conventional sets, the swivel set will maintain flush contact with the surface being riveted, despite small variations from vertical in gun position. This helps to prevent 'smiles' in the surface caused by a slightly cocked gun set. Also, the rubber outer boot around the set allows the operator's free hand to secure the face of the set to the work surface - this prevents smiles and it also prevents the gun from accidentally traveling off position. If the skin cannot be back riveted, normal riveting with a swivel set will help to maintain a similar quality.




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There are places on RVs which cannot easily be riveted by one person. Main wing skins are a good example. This becomes a two-person operation, with one bucking and one riveting. The principles of good riveting are exactly the same, the only variable introduced is the co-ordination of two workers (and the advantage of two extra hands). As the partners cannot see what the other is doing, a system of verbal signals is used to direct operations. One which works is:

1.The riveter inserts a rivet into the prepared hole; positions the gun for setting and calls, "ready".

2.The bucker positions the bucking bar over the rivet tail and, if its position is correct, will call, "go". If the rivet is in an awkward position the bucker may want to slide the rivet out and in to determine its point of balance (as above).  He/she will call, "out" while pushing the rivet out toward the riveter until the bar comes to rest on the aluminium. To reposition the rivet for setting the bucker will call, "in".

3.The riveter will firmly push the gun against the work and may also use the other hand to press the set against the work, if it is of the flush swivel type (see below). As the rivet re-seats this force pushes the bucking bar back into position.  If the  bucker is satisfied with the orientation of the bucking bar the call "go" is given.

4.The riveter then drives the rivet for a time determined by experience or a test piece. This interval is usually less than a second and is best remembered as a musical phrase, such as a drum roll.

5.The bucker will check the tail for quality and will call "next" if all is well and the pair can move on the the next rivet or "again" if the rivet needs a bit more driving or "remove" if the rivet is not acceptable. The riveter marks the rivet for later removal with a felt pen.




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1.Using shims, level the back riveting plate on the table.

2.Using a drill press, drill a half inch hole almost through a 4" x 4" x 2" piece of hardwood.

3.Mount a straight universal head rivet set in riveting gun.

4.Use Vaseline to push the end of the set into the hole in the hardwood.

5.Place the hardwood on the levelled surface plate so that the gun is supported vertically.

6.Secure a round bubble level vial to the butt of the rivet gun with RTV or a silicone adhesive.

7.Make sure the vial is positioned so that the bubble is in the centre.

8.Secure the assembly so that it cures in that position overnight.

This will aid in setting perfectly aligned rivets provided

a.The back riveting plate is levelled prior to use;

b.The gun is held with the bubble in the centre while riveting.

Note: It pays to periodically recheck calibration using the wood block and straight rivet set. The straight set is only used during calibration.  The back riveting set is reinstalled for actual riveting.




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Type II



Type III






If the builder is working alone, sometimes it is difficult to judge when the backriveting  set/gun is square to the surface being joined.


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Back riveting is a method of setting rivets, usually in a skin component, by striking the buck tails with a special gun set while the flush head is securely supported in its dimple or counter sink by a steel plate or bucking bar.

Control surfaces are usually back riveted using a horizontal steel plate mounted on a table.  The skin rivets are held vertically in their holes with thin Scotch Magic tape or fine Mylar tapes over the heads.  The internal rib or stiffener is placed over the rivets and the special gun set is used to sequentially set these fasteners.  Note:  try using all RV-Workshop Learning centre back riveting sets.

Type I







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Often components are more easily riveted as sub-assemblies (off the airframe).  A workbench allows components to be positioned and secured optimally for joining.

The bucking bar may be secured in a bench vice and, with the components positioned by hand, rivets are set with a gun held in the other hand.  The main advantage here is that the bar is stationary and the components may be more easily held and positioned for riveting.




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1. Rest bucking bar on inserted rivet and try to locate its point of balance.



2. With gun set in place, use bucking bar to push rivet (and gun assembly) outward.  Bucking bar will then register at right angles to the rivet as it comes to rest on the aluminium.



3. Push rivet back into place with gun set and reposition bucking bar, if necessary, to maintain its point of balance on the rivet. (repeat steps 2 and 3 until point of balance is determined).  Often the index finger can be placed on the back of the bucking bar directly opposite the rivet tail. It then becomes the 'sensor' for correct bar position.



4. Pressure is held on gun while riveting.  Bucking bar is held with only moderate force (otherwise rivet may be set with head proud of surface). A rubber grommet may be used over the rivet tail to assist in squeezing parts together during riveting.  It acts as a 'pressure plate'



5. Duration of riveting is determined by experimentation with a test piece or previous experience.


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