Section II. STAKING, PEENING, AND SWAGING
Reshaping (not removal) of metal is done by staking, peening, or swaging. These terms are defined in (1) through (3)
Staking is a method of securing parts by pushing surface metal together with punch and hammer.
Peening is the stretching of surface metal, usually with a ball peen hammer or with a hammer and a
specially designed round-nose chisel.
Swaging is the moving of metal throughout its entire thickness where a definite shape is desired.
General. Staking is a process usually employed to secure two parts together. It is not to be confused with
waterproofing of screwheads. Threaded parts that draw up to a certain critical point are sometimes staked to maintain that
position. The advantage of staking is that it holds parts together in a final position.
Staking with a punch and hammer may be difficult for the inexperienced repairer. A great deal of
damage may be done to the material being staked, such as bent tubular parts, if the procedure is
not followed with extreme skill and care.
Staking Threaded Parts (fig. 3-4).
A recommended procedure for staking threaded parts is as follows:
This procedure does not apply to optical components.
Be sure that the desired adjustment of the nut (1) on shaft (2) is correct.
Place center punch (3) at right angle to the nut surface and close to the shaft (2) but not so close that
punch will hit the shaft.
With a ball peen hammer, give the punch (3) a solid tap and then remove the punch.
Examine staking hole. If metal has moved enough to pinch threaded parts together, move on to next
If metal has not moved enough, move punch closer to the shaft (2). You may need to tilt the punch (4)
less than 90 degrees.
Stake at least two places (5), approximately 180 degrees apart. The size and the number of staking
holes will depend on the type of metal and size of parts to be staked.