Plunger Tip
Contacts the Unit Under Test (UUT). Proper configuration is critical for good contact and electrical performance.

Plunger Shaft
The cylindrical part is critical to the pointing accuracy of the probe assembly. Primary point of electrical contact between the plunger and barrel. Probe life is influenced by the plunger shaft’s wear characteristics.

Crimp
A precise deformation of the barrel at a specific location retains the plunger tail. A spin crimp, dimple crimp, or a roll-over crimp may be used depending on the probe series.

Plunger Tail
The enlarged bottom part of the plunger that retains the plunger. Secondary point of electrical contact between the plunger and the barrel.

Barrel
Housing for the spring and guides the plunger. Typically completely housed by the mating receptacle. Important electrical link between the plunger and receptacle.

Spring
Helical coil spring for maintaining a consistent counterforce to the plunger. Force determined by application. Base material determines probe performance in extreme temperatures.

Receptacle Terminology:

Press Ring
Larger than the recommended mounting hole; deforms slightly for press-fit into the mounting hole.

Alignment Bulge
Aligns the receptacle in the mounting hole prior to installation.

Barrel Housing
Critical electrical link that houses the barrel of the probe.

Detent
Provides retention and electrical connection to the probe barrel. Single or multiple detents based upon size.

Wire Termination
Means to connect a wire for electrical passage. Configured for crimping, soldering, wire wrapping, terminal insertion, or with preattached wire.