Specifications

Field Standards - Appendix B
Coaxial Cable -
(continued)
BNC: A three bladed rotary cutter should be used (measurements shown for this
particular connector). The first cut exposing the center conductor is .15625” from
the end of the wire. It should cut down to, yet not nick, the center conductor. The
second cut should be approximately .25” from the end of the wire and should cut
through the jacket and the shield, yet not nick or disfigure, the dielectric. The
third cut is .59375” from the end of the wire. It should cut down to, yet not nick,
the shield or foil. Nicks on the braid, dielectric or center conductor are not
acceptable. This weakens the physical connection and is detrimental in all
applications to bandwidth and shielding capabilities. The three parts of a BNC are
listed below.
Slide the outer ferrule onto the cable and flair the braid as described above in the
RF section. Place the mil crimp pin on the center conductor so that it butts against
the dielectric. Using the appropriate crimp die for your ratcheting crimp tool
(cross reference the BNC with the cable manufacturer and die manufacturer),
crimp the mil crimp pin in the small 6 sided cavity in the die. Install the plug
body assembly so that the inner ferrule slides over the dielectric but under the
shield braid. Push the plug body onto the cable until it snaps into place. Slide the
outer ferrule over the shield braid and against the plug body. Crimp the outer
ferrule with the large 6 sided cavity. Note that BNC crimping is an exact science
when it comes to matching crimp die, cable, and connector.
Most crimp tool manufacturers have interchangeable dies allowing one crimp tool
to be used to crimp a vast array of connectors.