1. Introduction and Overview
Thank you for choosing the Uharbour 1/4" 1-25 Nm Torque Wrench Set. This precision tool is designed for accurate tightening of fasteners, particularly on bicycles and other sensitive components, ensuring optimal performance and preventing damage from over-tightening. Each wrench is tested and calibrated to international standards (ISO 6789, GB/T 15729, ASME B107.14M) and comes with an individual calibration certificate.
Image 1.1: Overview of the Uharbour 1/4" 1-25 Nm Torque Wrench Set, including the wrench, various bits, and an extension bar.
2. Product Contents
Your Uharbour 1/4" 1-25 Nm Torque Wrench Set includes the following components:
- 1x Uharbour Bicycle Torque Wrench (1/4" drive, 1-25 Nm range)
- 11x Bits: H2, H2.5, H4, H5, H6, H8 (Hex), T20, T30, T40 (Torx), PH1, PH2 (Phillips)
- 1x 1/4" Elastic Bit Holder
- 1x 1/4" 100 mm Extension Bar
- 1x Calibration Certificate with Serial Number
Image 2.1: All 14 pieces included in the Uharbour Torque Wrench Set.
3. Setup
3.1 Attaching Bits and Sockets
- Select the appropriate bit or socket for your application.
- Press the quick-release button on the ratchet head.
- Insert the bit or socket firmly into the 1/4" drive.
- Release the button to secure the bit/socket. Ensure it is securely seated before use.
Image 3.1: The reversible ratchet head and quick-release button for easy bit/socket changes.
3.2 Adjusting the Torque Value
- Unlock: Slide down the locking ring on the handle to unlock the adjustment mechanism.
- Adjust: Rotate the handle to set the desired torque value. The scale is laser-engraved for clear readability. The handle swivels 360 degrees for easy adjustment.
- Lock: Slide up the locking ring to secure the set torque value. Ensure the handle is locked before applying torque.
Image 3.2: Steps for adjusting the torque value on the wrench.
4. Operating Instructions
4.1 Applying Torque
- Ensure the correct bit/socket is attached and the desired torque value is set and locked.
- Place the wrench onto the fastener.
- Apply steady, increasing force to the wrench handle in a clockwise direction (for standard right-hand threads). The ratchet head is reversible for counter-clockwise operation, but torque measurement is typically for clockwise tightening.
- Continue applying force until you hear and feel a distinct "click" from the wrench. This indicates that the preset torque value has been reached.
- Immediately stop applying force once the click is detected. Do not continue to tighten the fastener beyond this point, as it will result in over-tightening and potential damage.
Image 4.1: Using the torque wrench for precise tightening on a bicycle.
4.2 Torque Feedback
The wrench provides both an audible "click" and a tactile feedback when the set torque is reached. At lower torque values (1-3 Nm), the click sound may be quieter. For optimal performance, use the wrench in a quiet environment and pay close attention to the tactile feedback.
Image 4.2: Visual representation of the torque feedback mechanism.
5. Maintenance
5.1 Cleaning and Storage
- After each use, wipe the torque wrench clean with a soft, dry cloth. Do not use solvents or harsh chemicals.
- Store the wrench in its protective case in a dry, clean environment, away from direct sunlight and extreme temperatures.
- Important: Always reset the torque wrench to its lowest setting (1 Nm) before storing it. This relieves tension on the internal spring mechanism and helps maintain calibration accuracy over time.
5.2 Calibration
Your Uharbour torque wrench is factory calibrated and comes with a unique serial number and calibration certificate. For continued accuracy, it is recommended to have the torque wrench re-calibrated by a qualified service center after 12 months of use or approximately 5000 cycles, whichever comes first.
Image 5.1: Example of the calibration certificate provided with each torque wrench.
6. Troubleshooting
- No audible click at low torque settings (1-3 Nm): This is normal due to the mechanical principle of the torque wrench. Rely on the tactile feedback and use in a quiet environment.
- Inconsistent torque readings: Ensure the wrench is clean, properly stored, and reset to the lowest setting after each use. If issues persist, consider re-calibration.
- Difficulty adjusting torque: Ensure the locking ring is fully disengaged (slid down) before attempting to rotate the handle.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | 1/4 torque wrench (TW031) |
| Drive Size | 1/4 inch |
| Torque Range | 1-25 Nm |
| Accuracy | ±3% |
| Material | Chrome Vanadium Steel, Aluminum |
| Number of Items in Set | 14 |
| Dimensions (Package) | 32.79 x 10.7 x 5.2 cm |
| Weight (Package) | 820 grams |
| Standards | ISO 6789, GB/T 15729, ASME B107.14M |
8. Warranty and Support
Uharbour products are manufactured to high-quality standards. For any questions, concerns, or warranty claims regarding your torque wrench set, please contact Uharbour customer support through the retailer where the product was purchased. Please have your purchase details and the product's serial number (found on the calibration certificate) ready when contacting support.
