Troubles Crimping BNC Center Pin

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KE5YYM, Jul 26, 2018.

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  1. KE5YYM

    KE5YYM Ham Member QRZ Page

    I purchased a $20 crimp too from Amazon that has a small hex that is supposedly for the center pin to my BNC Crimp connector to RG58. The size is .068 for the small hex. Every time I try to crimp the center pin to the center conductor of my cable, the crimp tool obliterates the center pin. It works fine for the ferrule.

    Is it possible that I just have a bad batch of center conductors?
    Any tips as to what I'm doing wrong?
  2. AB3TQ

    AB3TQ Subscriber QRZ Page

    I like to solder my projects. However, I have also used quite a few crimpers for larger quantity "production" work. Good ones. Good crimpers are EXPENSIVE. A $20 crimper is not a good one. Look up a BNC crimper from a quality tool company. What do they cost? I didn't even look, so educate me.
  3. KE5YYM

    KE5YYM Ham Member QRZ Page

    Any tips for a soldering novice? In my case, I even tried soldering the center pin to the center conductor, but either 1) the heat warps the dielectric, blocking the BNC from fitting, or 2) the solder blocks the BNC from fitting.

    I found a crimper for around $30 from this page:
  4. KE5YYM

    KE5YYM Ham Member QRZ Page

    Also, what in your experience makes a good crimp tool?
  5. N1OOQ

    N1OOQ Ham Member QRZ Page

    Looks like a basic universal crimper. Which of those openings are you using for the center pin?

    with this kind of tool, you have to manually position the pin in the proper place. Some of them let you just push it in until it stops. Those are usually the expensive ones...

    Also, define "obliterates the center pin". What does it do to it, exactly?
  6. K7JEM

    K7JEM Ham Member QRZ Page

    The obvious question is what diameter are the center pins you are crimping? Perhaps they are bigger than .068. The other question would be brand and model of crimp tool. Also brand and model of BNC connector.
  7. KA9JLM

    KA9JLM Ham Member QRZ Page

    Are you using connectors/crimper made for RG-59 ?

    It sounds like maybe.
  8. W9GB

    W9GB Ham Member QRZ Page

    WHOSE BNC Connector are you using. RFA Industries BNCs will work with that Die size.

    RFA Industries BNC Connector, RFB-1100-2, (Nickel, Gold pin)
    for RG-58/U, RG-142/U, RF-55/U [Cable Group C]
    Crimp Hex Die: RFA-4009-04 (Dies: .178” .130” and .068”)

    13 Common BNC Connector Installation Mistakes (Belden)
    Last edited: Jul 27, 2018
  9. N5AF

    N5AF Premium Subscriber QRZ Page

    I've had very good luck with the Belden F, RCA and BNC Snap & Seal line of connectors. Well worth the money.

    One tool for all varieties of the SnS connectors:

    Disclaimer: I got the "genuine" Belden tool on clearance at a Home Depot for $20. You might not find it anywhere for that price..

    I buy the connectors from Mouser. You can order by the piece, which is handy.

    Helpful listing of all the SnS products:
  10. SV1IYF

    SV1IYF Ham Member QRZ Page

    There are two classes of BNC connectors.
    The original used for RF feeds been designed for a characteristic impedance of 50 Ohms and the subsequent for video tie lines of 75 Ohms.
    Until the event of serial digital video (SDI) the former was used indiscriminately.
    Analog video having a bandwidth of a couple of MHz didn't suffer from the 75/50 Ohms mismatch.
    On the other hand HD SDI bandwidth mounts up well into the GHz region. An 75 Ohms BNC connector became paramount.
    The diameter of the protruding part of the pin is standardized and could not be altered for compatibility reasons.
    For this part of the interconnection they corrected by altering the form/composition of the surrounding dielectric.
    On the part of the pin encasing the center conductor of the coax and also snapping into the connector body there was no such a limitation.
    Consequently, this diameter could be altered and indeed was done.
    It is frequent and normal that pins belonging to a certain BNC make can't fit into some other.
    One has to match the crimping tool with the connector at hand.

    73 Nikos SV1IYF

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