Body mild steel.
Ball steel or stainless steel hardened or POM.
Spring stainless steel or plastic.

Body black oxidised.
Ball bright.

The lateral spring plunger must be pressed into the hole to at least depth L3. These plungers are for positioning and holding small parts in fixtures. If mechanical machining of the workpiece is to be carried out, other clamps may be necessary. When the fixture is not in use it should be ensured that plastic springs are not under stress.

Spring force refers to a mean value.

1) knurl
2) light holding