Author Topic: How to remove the central pin from a BNC crimp connector  (Read 390 times)

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Offline iMoTopic starter

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How to remove the central pin from a BNC crimp connector
« on: January 02, 2025, 12:18:49 pm »
I got a bunch of BNC crimp connectors (for RG58, male) in past with the central pin inserted (vanilla, not crimped). While making couple of cables I wanted to use them as well, but it seems to me it is not so easy. The central pin is somehow locked inside the white teflon insulation and cannot be pushed out from the front side (I do not want to damage them so I tried with a small force so far).
Is there a trick or a tool how to free up the central pin?
« Last Edit: January 02, 2025, 12:38:08 pm by iMo »
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Offline inse

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Re: How to remove the central pin from a BNC crimp connector
« Reply #1 on: January 02, 2025, 12:45:04 pm »
At some connectors, the pin locks in the insulator.
If you push it out by force, the core plus dielectric will probably have to support the pin on reuse.
Should not be a problem with RG58 cable
 

Offline iMoTopic starter

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Re: How to remove the central pin from a BNC crimp connector
« Reply #2 on: January 02, 2025, 01:01:53 pm »
Yup, that is the case.. I've tried too and it "clicks" when the pin is pushed in.
 :palm:
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Offline coromonadalix

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Re: How to remove the central pin from a BNC crimp connector
« Reply #3 on: January 02, 2025, 05:34:31 pm »
sometime  you can push them backward,  but   you would need to sacrifice one, to see if it is reusable or it destroy the "snapping effect" if you rebuild the connector ...
 

Offline tooki

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Re: How to remove the central pin from a BNC crimp connector
« Reply #4 on: January 02, 2025, 05:54:11 pm »
Do you have the model number of the connector so you can find the original assembly instructions? In most coaxial connectors, the center pin attaches directly to the conductor. But there are some where the pin is permanently installed in the connector, and you crimp/solder an inner pin to the conductor, which then fits into the actual pin.


Also, Teflon softens a lot with heat. You may be able to extract the pin more easily if you first heat the connectors in an oven, at perhaps 100-130 degrees.
 

Offline iMoTopic starter

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Re: [SOLVED] How to remove the central pin from a BNC crimp connector
« Reply #5 on: January 03, 2025, 06:51:47 pm »
A friend of mine has made a tool for removing the pins, and we've tried.. A thin tube with an internal movable solid steel wire pushing the pin down.
With a certain force (pretty large, frankly) the pin jumped off when pushed down, with a "click". Out of my curiosity I pushed it back into the connector to see whether its removal has deformed the teflon - and it clicked nicely when I pushed it in and also when I removed it back afterwards.
No idea what is the part number or the type of the connector, I got a bag of them decades back on a local flea market almost free, the half of the connectors with pins inserted in (somebody played with them and they stuck).
So be careful when inserting the pins into the BNC connectors, it might be pretty difficult to get them back.

« Last Edit: January 03, 2025, 06:54:35 pm by iMo »
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