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I need to crimp the 18 awg wires into the 3-pin female JST VHR connector, but have no clue as to how to do it. How would the crimp latch onto the JST housing? Can somebody point me to any helpful resources? enter image description here Thanks!

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  • \$\begingroup\$ I agree with the answers about buying pre-terminated jumpers. But, to answer your question, please see this answer I wrote about crimping a different connector series. The method is the same. Good luck! \$\endgroup\$
    – bitsmack
    Oct 21 '20 at 9:06
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You already have an answer apparently pointing out the "proper" tool, which you could also determine from manufacturer guidance.

If you only need to do a few for prototype use however, there are more universal manual solutions, such as the Engineer PA-09 and PA-20. These require some degree of skill and experimentation to produce acceptable results, but are a pragmatic solution when you have more variety than you can justify having unique tools for.

Apparently official removal tools are expensive. A small jeweler's screwdriver makes an unofficial one, be careful not to bend the locking tab too far or you may have to bend it back and/or replace the contact.

You appear to have stripped far too much insulation, typical connectors crimp once on the bare wire and then also just past that over the insulation, but details vary - and vary even more if you end up needing to improvise with an official unsupported wire size.

Ultimately what the best solution is depends on the volume and requirements of your need...

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  • \$\begingroup\$ Another thing the pre-crimped jumpers have going for them is that they are already crimped perfectly (some contacts take a bit of practice to get right) and the wire is guaranteed to be compatible with the contact. Maximum insulation diameter for those contacts is 3mm; it looks like it might be OK in the picture but who knows. \$\endgroup\$
    – vir
    Oct 20 '20 at 23:33
  • \$\begingroup\$ Those can have their place, but the asker isn't making "jumpers" rather they seem to be putting the contacts on the end of the pictured 3-conductor cable. Maybe that could be ordered as a custom assembly. Maybe it should be. But there's also a role for an "I need to put this on this this afternoon" class of solution in many engineering labs, which makes it useful to know how to do that, as well... \$\endgroup\$ Oct 21 '20 at 0:27
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You could get the crimper and put terminals directly onto the wires you have; the part number is WC-930 and it's almost $500. Or, you could get pre-terminated jumpers from Digikey, et. al. and splice them onto the wires. They're less than $1 each. The contacts have a little tab on them that latches into a notch inside the connector housing. Just don't screw up the wiring since the extraction tool is $200.

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