How to crimp 1mm pitch connector (JST connector)

The principle of crimping a 2.54mm pitch female socket header and a 1mm pitch connector is fairly similar.

The difference is that a 1 mm pitch connector pin is much tedious to crimp because it is too small. For most people, a magnifying glass is required while doing the crimping.

JST 1mm pitch connector pin    1mm pitch pin for crimping onto wire

JST 1mm pitch connector receptacle housing receptacle socket for housing the pins


crimping tool for JST 1mm pitch connectorNot only it is small in size, the tool for crimping this 1mm pin is also difficult to find. This tool is rare, hence it is also very expensive. The crimping tool for a 1mm pitch pin (0.039″) can cost a couple of hundreds to a thousand of dollars. The tool name from JST (JAPAN SOLDERLESS TERMINALS) is called WC-SH2832 (Crimp Tool, Ratchet).


JST Connector pitch: 1mm

Connector pin width is less than 1mm

Wire Gauge Size is 32 to 28 AWG


Crimping 1mm pitch pin Step by Step

JST 1mm pitch connector pin
1- sleeve gripper for gripping the wire sleeve as a strain relieve,
2- wire strand gripper for the contact to the wire strand.

  1. Close up the sleeve gripper for the wire’s sleeve. This allows the pin to easily grip the wire when you position the wire for crimping.

    close up the wire sleeve gripper before inserting the wire

  2. Insert the wire into the pin. Position it nicely with the pin’s sleeve gripper end holding the wire sleeve. Ensure that the wire sleeve is over the sleeve gripper but before the wire strand gripper.
    1mm pitch JST connector pin (front side)     1mm pitch JST connector pin (side view)
  3. Crimp the sleeve gripper first. Then proceed to crimp the exposed wire with the wire strand gripper.
  4. After crimping, ensure that the width of the pin is less than 0.88mm. If the width is too big, it will not be able to fit into the connector housing. Use your crimper to lightly squeeze it narrower.
    ensure that the width of the 1mm pitch pin is less than 0.88mm
  5. After the wire is crimped to the pin, pull the wire to ensure that the crimp is tight. The crimp pin should not give way.
    Properly crimped 1mm pitch JST connector pin
  6. You should be able to easily slide the crimped wire into the connector housing without much force. If it is difficult to insert in, it is probably not done correctly. Redo again and do not force the pin into the receptacle housing.

Contact PIC-CONTROL for 1mm pitch wire assembly

For custom wire assembly of any 1mm pitch connector pin, please contact PIC-CONTROL.