A swager for tungsten alloy rod is a device which reduces the diameter of a rod by passing the tungsten alloy rod through a die which is designed to hammer the rod at about 10,000 blows per minute.

Generally, a swager will reduce the diameter of rod about 12% per pass. Swaging elongates the crystals, creating a fibrous structure. Although this is desirable in the finished product for ductility and strength, at this point the tungsten alloy rod must be stress-relieved by reheating.

Picture above shows the regular structure of swager for tungsten alloy rod :
1. Hardened Steel Liner
2. Roller Cage
3. Backers
4. Hammers
5. Tungsten Alloy Rod