1. Introduction
This manual provides essential information for the safe and effective use of your TOHNICHI CL5NX8D-MH Torque Wrench. Please read this manual thoroughly before operating the tool and keep it for future reference. The TOHNICHI CL5NX8D-MH is a general-purpose CL type torque wrench designed for precise torque application. Its metal handle with a knurled finish ensures a secure grip and easy cleaning, making it suitable for various working conditions, including use with gloves.
2. Safety Information
Always observe the following safety precautions to prevent injury and damage to the tool or workpiece.
- Wear appropriate personal protective equipment (PPE), such as safety glasses, when operating the torque wrench.
- Do not exceed the maximum specified torque range of the tool.
- Ensure the workpiece is securely fastened before applying torque.
- Do not use the torque wrench as a hammer or for prying.
- Keep the tool clean and free from oil, grease, or other contaminants that could affect grip or accuracy.
- Store the torque wrench in a dry, safe place away from direct sunlight and extreme temperatures.
3. Product Overview
The TOHNICHI CL5NX8D-MH torque wrench is a robust and reliable tool for accurate torque control. Below are images illustrating the product and its dimensions.
Figure 3.1: Front view of the TOHNICHI CL5NX8D-MH Torque Wrench. This image shows the main body of the wrench, including the knurled metal handle and the torque setting window with N·m markings.
Figure 3.2: Side view of the TOHNICHI CL5NX8D-MH Torque Wrench indicating its length. The wrench measures approximately 5.7 inches (14 cm) in total length.
4. Specifications
Technical specifications for the TOHNICHI CL5NX8D-MH Torque Wrench:
| Feature | Specification |
|---|---|
| Model Number | CL5NX8D-MH |
| Brand | TOHNICHI |
| Torque Measurement Range | 1 - 5 N·m |
| Torque Increment (1 Scale) | 0.05 N·m |
| Accuracy | ±3% |
| Operation Mode | Manual |
| Material | Metal |
| Color | Silver |
| Item Weight | 0.13 kg |
| Finish Type | Polished |
5. Setup
Before using the torque wrench, ensure it is properly set up for the desired torque value.
- Inspect the Tool: Check the torque wrench for any signs of damage, wear, or foreign objects. Do not use a damaged tool.
- Clean the Grip: Wipe the metal handle clean of any oil or grease to ensure a firm grip during operation.
- Set the Torque Value: Locate the torque adjustment mechanism, typically at the base of the handle. Rotate the handle or adjustment knob to align the desired torque value with the indicator line. For precise settings, ensure the main scale and vernier scale (if present) are correctly read.
- Secure the Setting: If your model has a locking mechanism, engage it to prevent accidental changes to the torque setting during use.
- Attach the Socket/Accessory: Firmly attach the appropriate socket or accessory to the drive square of the torque wrench.
6. Operating Instructions
Follow these steps for accurate torque application:
- Position the Wrench: Place the socket onto the fastener (nut or bolt head) you intend to tighten.
- Apply Force Smoothly: Apply a slow, steady, and continuous force to the handle of the torque wrench. Avoid sudden jerks or impacts.
- Listen for the Click: Continue applying force until you hear and/or feel a distinct "click" from the wrench. This indicates that the preset torque value has been reached.
- Stop Immediately: Once the click is detected, stop applying force immediately. Do not continue to tighten the fastener beyond the click, as this will over-torque it.
- Remove the Wrench: Carefully remove the torque wrench from the fastener.
- Repeat for Multiple Fasteners: If tightening multiple fasteners, repeat the process for each one.
Important: For critical applications, it is recommended to re-check the torque after a short period or after the assembly has been in use, as fasteners can sometimes loosen slightly.
7. Maintenance
Proper maintenance ensures the longevity and accuracy of your torque wrench.
- Cleaning: After each use, wipe the torque wrench clean with a dry, soft cloth. If necessary, use a mild, non-abrasive cleaner to remove stubborn dirt or grease. Do not immerse the wrench in liquids.
- Storage: Store the torque wrench in its protective case (if provided) or a clean, dry environment. It is recommended to store the wrench with the torque setting at its lowest value (but not below the minimum range) to relieve tension on the internal spring mechanism.
- Lubrication: The internal mechanism of the torque wrench is factory-lubricated and generally does not require user lubrication. Unauthorized disassembly or lubrication may affect accuracy and void the warranty.
- Calibration: Torque wrenches are precision instruments and require periodic calibration to maintain accuracy. The frequency of calibration depends on usage, but generally, annual calibration or after 5,000 cycles (whichever comes first) is recommended. Contact an authorized TOHNICHI service center for calibration services.
8. Troubleshooting
If you encounter issues with your torque wrench, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Wrench does not click | Torque setting too low; Fastener already tight; Wrench damaged. | Increase torque setting; Check fastener tightness manually; Inspect wrench for damage, if damaged, do not use. |
| Inaccurate torque readings | Improper technique (jerking); Wrench out of calibration; Damaged internal mechanism. | Apply force smoothly and steadily; Have the wrench calibrated; If damaged, contact service. |
| Difficulty setting torque | Adjustment mechanism dirty or stiff; Locking mechanism engaged. | Clean adjustment area; Disengage locking mechanism before adjusting. |
For problems not listed here or if solutions do not resolve the issue, please contact TOHNICHI customer support.
9. Warranty and Support
TOHNICHI products are manufactured to high standards and are backed by a manufacturer's warranty against defects in materials and workmanship. Specific warranty terms and conditions may vary by region and product. Please refer to the warranty card included with your product or visit the official TOHNICHI website for detailed information.
For technical support, service, or calibration inquiries, please contact your local authorized TOHNICHI distributor or customer service center. When contacting support, please have your model number (CL5NX8D-MH) and purchase information readily available.