RC crimp connectors, 2S, 3S, 4S and 6S, plus servo, and the tool to do it? UK based

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.

Fireblade

Well-known member
Messages
270
Reaction score
273
Points
243
Location
England
Corally RC's
  1. Kagama
  2. Radix
Bit of a lengthy title! I have a 3S pack that's got a dodgy balance plug and needs replacing, it occurred to me I might as well get everything I need for the stuff I use.

With that in mind I need 2S 3S 4S and 6S JST-XH male? plugs, female inserts, both male and female servo plug and socket and inserts, and the crimpy thing to make it all happen.

Looked at a million sets on AliExpress but none of them have the 7 pin XH for 6S

What are the servo plugs called? Is it Dupont?

Thanks in advance for the advice.

UK based.
 
JR connector for servo plug I believe

I just found this on AliExpress: £1.74 | 10Pcs 2S 3S 4S 5S 6S LiPo Battery Balance Connector XH2.54mm Plug 2.54 Charger Plug 3-12pin for DIY RC Model Airplane Car
https://a.aliexpress.com/_ExRIvqo
 
Best deal I could see this should do most plugs you’ll need in rc just need to buy a crimping tool.

I just found this on AliExpress: £12.25 | 400pcs Servo Connector Socket Crimp Pin Cable Kit 22AWG Wire for JR JST SYP Futaba DIY Servo Extension Cable 2.54mm Terminal
https://a.aliexpress.com/_EH6OU0Y
 
Last edited:
Molex SL connectors can also be used as servo connectors and work much better with generic crimpers. For the female contacts you want series SL71851 which are meant for non latched housings with a small number of contacts *not* SL70058 which are meant for latched connectors or non latched with a large number of contacts. The difference is the former uses bowed spring contacts and the latter uses lead contacts, a three contact non latched housing will easily fall out if you use the SL0058. Male contacts are series SL0021

This is the housing you use for servo leads:

https://www.digikey.com/en/products/detail/molex/0050579003/115005

Here are some examples of the contacts:

https://www.digikey.com/en/products/detail/molex/0016021124/1656203
https://www.digikey.com/en/products/detail/molex/0016020119/1656197

All Molex SL contacts come in 22~24 AWG 26~30 AWG and 32~36 AWG
(you match the contact to the wire AWG you are using) as well as two different thicknesses of gold plating and two thicknesses of tin plating.

Molex SL's wire to wire options are excellent but I'm not going into that. I will point you to Hansen Hobbies they sell cheap but good quality off-brand knockoffs of the wire to wire housings and terminals (they are the kind for latched housings and not suitable for non latched).

https://www.hansenhobbies.com/products/connectors/pt1inlpconnectors/

And yes those are the same thing as ASHLOK connectors. ASHLOK connectors are off brand Molex SL clones with a huge markup. (Sorry if I'm being mean but nobody should buy those)

Also the Molex HTR 8519B is an ancient "obsolete" tool for Molex SL contacts that you can often find on ebay for under $100. It has a terminal holder and a wire stop and dies for 22~24AWG and 26~30AWG. You somtimes need to adjust the crimp height with a micrometer (calipers can be used in a pinch we aren't building rockets after all) if it's been used for a long time. The datasheets for current official SL crimp tools will have a chart for the correct crimp height. Additionally always make sure that itn has the terminal locator block on the back, a lot of times it'll missing If the seller has carefully avoided showing the backside of the tool then it's probably missing this. There are two variations of the HTR 8519B one with square jaws ends and one with more rounded ends but they are functionally the same.

You won't find any manuals for this tool online it's way too old for that, most sellers do not know what it is. I know about it because I remembered seeing "use HTR 8519B" scribbled into the margin of an ancient paper scematic that called for SL connectors long ago and seeing it on ebay jogged my memory.

EDIT: You need a small tool like a flat head jewler's screwdriver to press the contact down into the housing and lock it in place, this is what the crenelations on one side of the back end of the connector are for. If nyou don;ltm know this then getting the contacts in can be frustrating. They have an "official" tool for this but a very small flat heat screwdriver works perfectly.
 
Last edited:
Back
Top