1. Introduction
The JST WC-260 is a high-precision manual crimping tool designed for reliable electrical connections. Engineered with ergonomics in mind, it features a parallel action mechanism to ensure consistent and accurate crimps. This tool is specifically compatible with JST's SEH-001T-P0.6 loose piece terminals and supports various wire gauges, making it a versatile addition to your toolkit. This manual provides essential information for the safe and effective use, maintenance, and troubleshooting of your WC-260 crimping tool.
2. Safety Information
Always adhere to the following safety guidelines to prevent injury and damage to the tool:
- Wear appropriate personal protective equipment (PPE), such as safety glasses, when operating the tool.
- Ensure the tool is clean and free of debris before and after each use.
- Do not use the tool for purposes other than crimping specified terminals and wires.
- Keep fingers and other body parts clear of the crimping jaws during operation.
- Store the tool in a dry, secure place, out of reach of children.
- Do not attempt to modify or repair the tool yourself. Refer to qualified personnel for service.
3. Product Overview and Components
The JST WC-260 crimping tool consists of several key components designed for optimal performance.

Key Components:
- Crimping Jaws: Precision ground jaws with multiple cavities for different wire gauges (22 AWG, 24 AWG, 26 AWG, 28 AWG, 30 AWG).
- Ergonomic Handles: Soft, ergonomically designed handles for comfortable and secure grip during prolonged use.
- Ratchet Mechanism: Ensures a complete crimp cycle for consistent and reliable connections. The ratchet releases only after the crimp is fully formed.
- Parallel Action: Designed for parallel jaw closure, providing uniform crimping force across the terminal.
- Coupling Flap Shelf: Aids in correctly positioning the terminal during the crimping process.
4. Setup
The JST WC-260 crimping tool requires minimal setup before use. Ensure you have the correct terminals and wires for your application.
- Inspect the Tool: Before first use, inspect the crimping tool for any signs of damage or wear. Ensure the jaws open and close smoothly.
- Identify Wire Gauge: Determine the gauge of the wire you intend to crimp. The crimping jaws are marked with corresponding AWG sizes (22, 24, 26, 28, 30).
- Select Terminal: Ensure you are using JST SEH-001T-P0.6 loose piece terminals or other compatible terminals as specified by JST.
5. Operating Instructions
Follow these steps for proper crimping:
- Prepare the Wire: Strip the insulation from the end of the wire to the recommended length for the terminal. Avoid damaging the wire strands.
- Open the Jaws: Squeeze the handles of the crimping tool to fully open the crimping jaws.
- Insert Terminal: Carefully insert the terminal into the appropriate crimping cavity. Ensure the terminal is seated correctly and aligned with the coupling flap shelf for proper contact position.
- Insert Wire: Insert the stripped wire into the terminal, ensuring all wire strands are within the crimp barrel.
- Crimp: Slowly and firmly squeeze the handles together until the ratchet mechanism releases. This indicates a complete crimp cycle. Do not release the handles until the ratchet has fully disengaged.
- Remove Crimped Terminal: Once the ratchet releases, open the handles and carefully remove the crimped terminal.
- Inspect Crimp: Visually inspect the crimp for proper formation. The wire insulation should be securely gripped, and the conductor crimp should be tight and uniform. Gently tug on the wire to ensure it is securely fastened.
6. Maintenance
Proper maintenance will extend the life and performance of your JST WC-260 crimping tool.
- Cleaning: After each use, wipe down the tool with a clean, dry cloth to remove any dirt, dust, or residue. For stubborn grime, a mild, non-abrasive cleaner can be used, ensuring the tool is thoroughly dried afterward.
- Lubrication: Periodically apply a small amount of light machine oil to the pivot points and moving parts to ensure smooth operation. Avoid over-lubrication.
- Storage: Store the tool in a dry environment to prevent rust and corrosion. Keep the jaws closed when not in use to protect the crimping surfaces.
- Inspection: Regularly inspect the crimping jaws for wear, damage, or misalignment. If any issues are found, discontinue use and contact JST support.
7. Troubleshooting
If you encounter issues with your JST WC-260 crimping tool, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Crimp is loose or inconsistent. | Incorrect wire gauge or terminal used; incomplete crimp cycle; worn jaws. | Ensure correct wire and terminal match the selected cavity. Squeeze handles until ratchet fully releases. Inspect jaws for wear; if worn, tool may need replacement or professional service. |
| Handles are stiff or difficult to close. | Lack of lubrication; dirt/debris in mechanism. | Clean the tool thoroughly. Apply a small amount of light machine oil to pivot points. |
| Ratchet does not release. | Tool not fully closed; foreign object obstructing mechanism. | Ensure handles are squeezed completely until the ratchet clicks and releases. Check for and remove any obstructions. Do not force the tool. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | WC-260 |
| Manufacturer | JST |
| Compatible Terminals | JST SEH-001T-P0.6 (loose piece) |
| Supported Wire Gauges | 22 AWG, 24 AWG, 26 AWG, 28 AWG, 30 AWG |
| Grip Type | Ergonomic |
| Product Weight | 1.72 kg (3.79 lbs) |
| Package Dimensions | 24.89 x 17.78 x 16.26 cm |
| ASIN | B00XM77WLI |
| First Available Date | March 13, 2016 |
9. Warranty and Support
For warranty information or technical support regarding your JST WC-260 crimping tool, please contact JST directly or refer to their official website. Keep your purchase receipt as proof of purchase.





