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Coax Crimping dies

Discussion in 'General Technical Questions and Answers' started by N3DT, Aug 13, 2019.

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  1. N3DT

    N3DT Ham Member QRZ Page

    I asked on the other forum but didn't get much for replies. I got a good deal on an Ideal crimper with .429, .100 and .080 hexes. Then I got a die with .178, .128 and .068. Now all I really need is .255 and .213 to complete my needs. But there's all these other sizes out there, what are they for? I'm seeing .197, .178, .137, .100, .080, .068, .052, .042. What are these used for? Looks like I need either a MGS 7505-die-8X or RFA-4005-01. Best price I can find is ebay for less than $18 for the MGS one. I think I paid half that for the my crimper and die. There's some cheap looking ones out there too for $5.

    Also I find a lot of info on the dies and sizes, but not much info on what the different sizes are used for, or even instructions on exactly how and which to use. The normal stuff is easy, RG8, RG8X, RG58, 59 etc. The MGS site shows the normal stuff.
  2. W9GB

    W9GB Ham Member QRZ Page


    The various Die sizes are for DIFFERENT Coaxial Cables and RF Connector Types (UHF, N, BNC, TNC) needs (Center Pin, Ferrule).
    REMEMBER: Center Conductors on Coax can be Stranded or Solid / Different diameters.
    That is main reason for variety of small crimp sizes for Center Pins.
    You can easily determine Ferrule Crimp sizes, by the Common Outside Diameter (O.D.) of Coax.

    0.405 Coax : RG-8/U, RG-11/U, RG-213/U ferrule uses the 0.429 die; center pin 0.100”
    LMR-400 coax cable has larger center conductor: 0.128” die for center pin (and correct UHF connector)

    0.193 Coax : RG-58 ferrule uses the 0.213 die; center pin 0.068”

    0.240 Coax : 8X-type and RG-59 ferrule uses 0.255 die.


    For UHF connectors (PL-259):
    The BOTTOM DIE handles RG-58 and 8X-type coaxial cables.
    The TOP DIE handles RG-213 (0.100 center pin) and LM-400 cables (0.128 center pin).
    Coaxial Crimp connectors: UHF, BNC, a few N in a Stanley Sortmaster box ($9 Sale at Ace hardware, last month).

    Attached Files:

    K3XR likes this.
  3. N3DT

    N3DT Ham Member QRZ Page

    Yeah, I knew the different size dies are for different coax, but there only seems to be instructions for the outside ferrules/sizes like you have indicated above. What I'm looking for is the little ones for the center pins or tiny coax, .041 through .137, there doesn't seem to be any info on what to use for what. Most of the time I solder the center pins anyhow so it's almost moot, but I'd like to know.

    Is there a better place than MGS to get these dies? I can get the MGS /255/.213 one on ebay for $17, from MGS it's over $20 and some of them go for over $40 from other places.
  4. W9GB

    W9GB Ham Member QRZ Page

    You are not using Small Coax cables (RG-174/U) or the Smaller coax connectors (SMA, SMB, mini-UHF, etc.) used in automotive, aerospace, & cellular/microwave industries.

    0.068” crimp is center pin for BNC connectors

    0.052” crimp is center pin for Mini-UHF used on some Motorola LMR radios.
  5. N3DT

    N3DT Ham Member QRZ Page

    Actually I might use some RG174 or RG188 or RG312. But it looks like I've got everything covered that I need once I get the .213 and .255 dies. Thanks.
  6. AA3EE

    AA3EE Ham Member QRZ Page

    Lots of different connectors use hex crimps, not just for coax. Some fiber connectors use crimp ferrules on the aramid (kevlar) strands for mechanical strength.
    It's sort of like asking what does this slotted screwdriver fit?
  7. W9GB

    W9GB Ham Member QRZ Page

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