Engineer PA-09 Crimping Pliers quick review

Engineer  PA-09 Crimping Pliers quick review Pinterest
PA-09 Crimping Pliers

Introduction to crimping pliers

Most of my crimping experience is with larger cables and terminals. When it came to repair or make the odd non critical smaller terminal i would attempt to compress with pliers and solder, not ideal.

Faced with the task of having to make and repair several different terminals for a 3D printer i realized the need to invest in a pair of suitable crimping pliers.

These terminals included 6 way female JST PH 2.0mm connectors for the stepper motors and 2/4way Mini PV (Also called Dupont) with a 2.54mm pitch for connection to a ramps 1.4 board.

LEFT: 2&4way Mini PV (Dupont) with a 2.54mm pitch, RIGHT:  6 way female JST PH 2.0mm
LEFT: 2&4way Mini PV (Dupont) with a 2.54mm pitch, RIGHT: 6 way female JST PH 2.0mm

When i searched for a specific JST PH crimper i came across the official WC-240 JST Crimper. At an eye watering £337.99 this was out of the question.

Official crimp pliers are available for every different type of connector and can be very expensive. I turned to find a pair of budget generic crimp pliers capable of handling 24AWG cable and the connectors above.

What is available and where?

After a short browse of generic crimp pliers i found the Engineer PA-09 Mirco connector pliers. Capable of crimping 80 different terminals 0f 1.25-2.5mm pitch and 32-20AWG cable, just the ticket.

Engineer PA-09 Crimping Pilers

The PA-09 micro connector pliers are 175mm long, carbon steel construction with a Elastomer (TPR) cushioned handle and are made in Japan.

This all sounded promising, without a local shop/supplier i found them listed on amazon at a very reasonable £39.99. *Available HERE.

*Affiliate link - ENGINEER pa-09 Universal Crimping Tool
*Affiliate link – ENGINEER pa-09 Universal Crimping Tool

Testing the PA-09 Crimping Pliers

After a very quick delivery, i put them straight to the test. Removing them from the Japanese text covered packing the quality is immediately noticeable.

PA-09 Crimping Pliers in packaging
PA-09 Crimping Pliers in packaging

They feel nice in the hand and the hinge mechanism is smooth with an adjustable screw

Following the instructions provided, i started with with the JST PH connector. Firstly inserting the striped wire into the crimp and crimping the conductor.

Secondly, re-positioned to the next size die and crimp the insulation.

Finally to get a smooth entry into the connector housing, i pressed the terminal between the end of the pliers jaws. Repeating the process for the other conductors.

6 Way JST PH 2.00mm connector
6 Way JST PH 2.00mm connector

For the Mini PV/Dupont connectors, just select the correct die and follow the same procedure. I found that helping hands(a stand with clamps) useful to hold the wire in place whilst carrying this out.

LEFT: Completed Mini PV/Dupont RIGHT: Completed JST PH
LEFT: Completed Mini PV/Dupont RIGHT: Completed JST PH

The Verdict

My overall opinion of the PA-09 is that they well made, good value and capable of making accurate and reliable crimps for many different terminals.

The versatility and cost of these crimp pliers will help save time from bodged terminals and money spent on made leads, a winning combination and a sure tool to turn to in the future.

Crimping larger cable and terminals?

If you need to crimp larger cable and terminals, the ENGINEER pa-21 is suitable for AWG28~AWG18 with 1.6mm, 1.9mm, 2.2mm & 2.5mm dies. Both variants are listed below.

I hope you found this useful, if you have any questions or would like to add to the above please leave a comment.

Model of the day

Wavy Card Tray – Dual Deck Playing Card Holder by printfutura

Wavy Card Tray – Dual Deck Playing Card Holder
by printfutura 

Wavy Card Tray – Dual Deck Playing Card Holder by, printfuturaPublished on September 19,, Creative Commons – Attribution – Non-Commercial

Available HERE

12V Power Supply

In this article we will take brief look at how a ATX PSU can be utilized for various projects.

Bestec ATX PSU

In this article we will take a brief look at how a ATX PSU can be utilized for powering various projects.

WARNING: Before attempting to work on any electrical components it is essential that you are competent, isolate all live conductors and prove this with a reliable instrument. This is imperative when mains voltage is involved, the PSU must be disconnected (UNPLUGGED). Also note there may be undischarged capacitors that also pose a shock risk, allow these to discharged before handling. Carry out the following at your own risk!

ATX (Advanced Technology eXtended) power supply units are used in computers. As a result they are readily available and cheap.

The primary purpose of a PSU is to turn the incoming 230v AC (alternating current) into DC (Direct Current), in the case of a ATX PSU, various outputs for the computers components.

They come with different specifications which are stated on the units label, an example of this can be seen below.

First step

Confirm that the PSU is suitable for the desired use. For example a reprap style FFF printer: controls, motors and a single hotend using approximately 5 Amps and a heatedbed at 8 Amps. A total of 13Amps at 12 Volts gives us an estimated max 156W.


We need to make a few changes to replicate a motherboard connection to tell the PSU to turn on and deliver power. This is achieved by locating the PS _ON Green wire and connecting to ground, in this case i used 1oo ohm resistor connected to any of the ground wires (black).

ATX PSU Molex 24pin Motherboard connector

At this stage the PSU should turn on and output power. Now is a good time to verify the outputs with a volt meter. Yellow (+12Va) and Red (+5V) to ground +/-5%.


We need to apply a dummy load to the +5V rail. A resistor or load such as a light can be used here. See the example below using a 12V 50w halogen light, at 5V the additional load is 10 Amps. Be aware that the light or resistor used will get hot!

50W 12V halogen connected to +5V rail

At this stage the PSU should be providing a stable usable 12V supply.

The +3.3V does not have a use for this application however joining one of the +3.3V wires(Orange) to +3.3VS (Brown Sense wire) should remove any issues the psu has with detecting voltage drop of the 3.3V rail.

Last but not least is to check the current carrying capacity of the cables you have selected and ensure that this is greater than the maximum current drawn.


We can tidy up all the wiring and connect to suitable terminal blocks. Braiding of the cables can help reduce tangles and keep things neat.

As this is supplying a ramps 1.4 board with a heated bed i decided to use the +12Va (Yellow) for the 11A connection and +12Vb for the 5A connection.

One last suggestion is to verify the voltage and polarity before making the final connection to sensitive circuits to avoid damage.

If you feel i have left something out and would like to add to the above please leave a comment below.