What a piece of machining and engineering! It has a thin tool steel "fence" so the insulated part of the wire cannot be inserted too far into the contact and very different dies for the contact and strain relief crimp. One is an Amphenol tool for even smaller contacts than these. I do have a number of professional hand crimpers, some inherited, some by osmosis from past employment. I'm sure even the Hobby King unit would be better made. I checked out what Jaycar had to offer today, yuck. The Hobby King unit looks reasonable for the money. Looked quite good but the photos made in hard to tell how well they'd work with the Molex contacts. Note that JST 'mini'(JST-PH) have a different pitch (2mm) and are used only on plugs located on steppers (if any), so Steppers to boards cables are often JST-PH 6 pins to JST-XH 4 pins, but the pin order is not standardised throughout stepper sellers(.).I did look at the "Engineers" brand crimpers on eBay. Molex-KK254 and JST-XH are completely incompatible (shape and pin size). You can use a female JST-XH or Molex-KK254 on male 'Dupont' headers, but there will be no locking. They are used a lot in RC models, so cables, connectors and sets are easy to find. You may use the same crimping tool as for Dupont. JST-XH connectors (rating 3A, original standard from Japan) are what you may find on Chinese clone boards and shall also be preferred to Dupont as they have a better locking and are mechanically coded. Beware the Molex-KK exists with different pitches and they are not related with PC connectors from same brand. However, it is more difficult to find complete sets and cables than for other connectors. Their rating is 4A and their pins are slightly bigger than 'Dupont'. Molex-KK 254 are also connectors with a pitch of 2.54mm that you can find on printer boards (Duets and Smoothieboard). Note that to remove a Dupont pin or plug from its shell, you need to lift the small plastic tongue locking it with a micro screwdriver.Īs they have no locking, it is wise to secure them with glue or tape. It is NOT recommended to solder, as this create a hard point which under stress, WILL break one day. So you need a ratchet type crimp tool and learn to use it. The problem is they are quite difficult to crimp with ordinary pliers. 'Dupont'(Mini-PV) connectors (pitch 2.54 mm, rating 3A) are low cost and as the power carried in a printer is low, they could be used for anything except heating. 'Dupont'(mini-PV), Molex-KK254 and JST-XH connectors The ratchet tool may need adjustment (see the teethed wheel on the side). The Silverline ratchet tool PL55 is not the best quality but is more usable than the basic tool sold with terminals assortments which needs athletic capabilities. Note the colour mark on tool, same as terminal colour
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