On
parts of a primer
Parts of a Primer



Parts of a Primer








Parts of a Primer
1. Primer Cup - A small metal cup, into which the primer mixture is
   loaded. The capsule that is open to one side, into which the anvil
   and the primer ignition material are inserted.

2. Charge/Primer Compound/Primer Mix/Pellet - serves to ignite
   the main powder charge.

3. Paper Disc - (Foil) acts as a shield for the pellet, protecting
   it from moisture and other disruptive influences that may effect
   performance or reliability.

          Foil Paper (Paper Disc) is placed between the mix and the anvil to
          facilitate assembly.

4. Anvil - the point against which the priming compound is crushed
   to detonate the primer.

                An internal metal component in a boxer primer assembly
                against which the priming mixture is crushed by the firing
                pin blow.

               A metal feature in the primer pocket of a Berdan-primed
               cartridge case, against which the priming compound is
               crushed by the firing pin blow

5. Vent/Flash Hole - allow the flash of the primer to reach the inside
   of the case and ignites the gunpowder.
   The explosive ignites and shoots a flame through the flash hole,
   igniting the propellant to fire the cartridge.

Primer - a metal cup containing primary explosive inserted into a
recess in the center of the base of the cartridge.

Primers are made of a copper or brass alloy cup with a brass anvil and
are filled with an impact-sensitive lead styphnate igniter. The metal
parts of the primer are usually nickel-plated to resist corrosion.

The primer consists of a brass cup, a highly explosive primer charge,
a shellacked paper disk to keep out moisture and a brass anvil with
a pointed end.