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Tungsten bucking bars are denser than steel, resulting in the same weight but half the size. They are often used in rivet setting to upset the shank of the rivet and reduce the recoil when reflecting the impact back to the rivet shank.
Tungsten bucking bars are not only used in tight areas, but also can significantly reduce vibration and greatly improve operator comfort. These tungsten alloy products cost more than standard steel bars but once you have used one, you will never regret your purchase. One tungsten bucking bar can take the place of many conventional steel bars.
Application
Tungsten 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. These tungsten alloy products are used to form buck tails on rivets.
Performance of Tungsten Bucking Bar
| Tungsten Heavy Metal Grade Chart | |||||||
MIL-T-21014 Rev D | Class 1 | Class 2 | Class 3 | Class 4 | Class 1 | Class 2 | Class 3 |
SAE-AMS-T-21014 | Class 1 | Class 2 | Class 3 | Class 4 | Class 1 | Class 2 | Class 3 |
ASTM B777-07 | Class 1 | Class 2 | Class 3 | Class 4 | Class 1 | Class 2 | Class 3 |
AMS 7725 C | 7725 C |
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| 7725 C |
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Matrix (wt. %) | 90.0% W | 92.5% W | 95.0% W | 97.0% W | 90.0% W | 92.5% W | 95.0% W |
Binder (wt. %) | 10.0% Ni-Fe | 7.5% Ni-Fe | 5.0% Ni-Fe | 3.0% Ni-Fe | 10.0% Ni-Cu | 7.5% Ni-Fe | 5.0% Ni-Cu |
Nominal Density (g/cm3) | 16.85-17.25 | 17.15-17.85 | 17.75-18.35 | 18.25-18.85 | 16.85-17.25 | 17.15-17.85 | 17.75-18.35 |
Nominal Density (lb/in3) | 0.614 | 0.632 | 0.650 | 0.668 | 0.614 | 0.632 | 0.650 |
Typical Hardness (Rc) | 26 | 26 | 28 | 30 | 26 | 26 | 28 |
Ultimate Tensile Strength - Min. (psi) | 110,000 | 110,000 | 105,000 | 100,000 | 94,000 | 110,000 | 94,000 |
0.2% Offset Yield Strength - Min. (psi) | 75,000 | 75,000 | 75,000 | 75,000 | 75,000 | 75,000 | 75,000 |
Magnetic Characteristics | Slightly magnetic | Slightly magnetic | Slightly magnetic | Slightly magnetic | Nonmagnetic | Nonmagnetic | Nonmagnetic |
Package and Transportation
We pack tungsten bucking bars in plywood case and send them by ocean or air.
