Introduction
The ProGrade 11850 3/8" Drive Micro Adjusting Torque Wrench is a precision instrument designed for applying a specific amount of torque to fasteners. This tool is essential for automotive, industrial, and general mechanical applications where accurate torque is critical for safety and performance. It features a durable construction and an internal torque control mechanism for reliable operation. This manual provides detailed instructions for the proper use, maintenance, and care of your torque wrench.
Safety Information
Always observe the following safety precautions when using your torque wrench:
- Read and understand all instructions before operating the tool.
- Wear appropriate personal protective equipment, including safety glasses, to prevent eye injury.
- Ensure the workpiece is securely fastened before applying torque.
- Do not use the torque wrench as a breaker bar or for loosening fasteners. It is designed for tightening only.
- Do not exceed the maximum torque capacity of the wrench (80 ft/lbs).
- Keep the tool clean and free from oil or grease to maintain a secure grip.
- Store the torque wrench in its protective case when not in use, and always set it to its lowest torque setting (but not below the minimum) before storage to relieve spring tension.
Product Components
Your ProGrade torque wrench consists of the following main components:
- Drive Head: 3/8" square drive for attaching sockets. Features a precision machined gear assembly for smooth ratcheting action.
- Wrench Body: Chrome plated mirror polish finish to prevent rust and corrosion. Made from heat-treated chrome vanadium steel for maximum durability.
- Adjustment Collar: Knurled collar for setting the desired torque value.
- Lock Nut: Secures the torque setting once adjusted.
- Scale: Clearly marked scale for precise torque adjustments in foot-pounds.
Image: The ProGrade 3/8 inch drive micro adjusting torque wrench, showcasing its polished chrome finish and knurled adjustment handle.
Setup
Before first use, and periodically thereafter, inspect your torque wrench for any signs of damage or wear. Ensure the drive head operates smoothly.
Initial Inspection:
- Remove the torque wrench from its durable storage case.
- Wipe down the wrench with a clean, dry cloth to remove any packaging residue or dust.
- Check that the adjustment collar turns freely and the lock nut secures properly.
Operating Instructions
Setting Torque:
- Unlock the adjustment collar by turning the lock nut counter-clockwise.
- Rotate the adjustment collar until the desired torque value (between 5-80 foot-pounds) aligns with the main scale. The wrench features a micro-adjusting mechanism for fine-tuning.
- Once the desired torque is set, turn the lock nut clockwise to secure the adjustment collar in place. This prevents accidental changes during use.
Using the Torque Wrench:
- Attach the appropriate socket to the 3/8" drive head.
- Place the socket onto the fastener you wish to tighten.
- Apply steady, smooth pressure to the handle in a clockwise direction. Do not jerk or apply sudden force.
- Continue applying pressure until you hear and feel a distinct "click" or "break" in the handle. This indicates that the preset torque has been reached.
- Stop applying force immediately after the click. Do not overtighten.
- Remove the wrench from the fastener.
Image: A detailed diagram highlighting key features of the ProGrade torque wrench, including its precision machined gear assembly, chrome plated finish, and heat-treated chrome vanadium steel construction. Also includes a table of available drive sizes and their corresponding torque ranges.
Maintenance
Proper maintenance ensures the longevity and accuracy of your torque wrench:
- Cleaning: After each use, wipe the wrench clean with a dry, lint-free cloth. Do not use solvents or harsh chemicals, as they may damage the finish or internal components.
- Storage: Always return the torque wrench to its lowest torque setting (5 ft/lbs) before storing it in its durable protective case. This relieves tension on the internal spring mechanism, preserving its calibration. Store in a dry, clean environment.
- Calibration: Torque wrenches are precision tools and may require periodic re-calibration to maintain accuracy. While this wrench is calibrated with an internal torque control mechanism, professional re-calibration is recommended annually or after significant impact or misuse.
Image: The ProGrade torque wrench neatly stored within its custom-fit, durable hard case, designed for protection and easy transport.
Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Wrench does not click | Torque setting too high for application; fastener already tight; internal mechanism issue. | Verify torque setting; ensure fastener is not already at desired torque; if issue persists, seek professional inspection. |
| Inaccurate torque readings | Improper use (jerking motion); wrench dropped; out of calibration. | Apply smooth, steady pressure; avoid dropping the tool; consider professional re-calibration. |
| Adjustment collar is stiff | Dirt or debris; lock nut overtightened. | Clean the wrench thoroughly; loosen the lock nut before adjusting. |
Specifications
| Feature | Specification |
|---|---|
| Model Number | 11850 |
| Drive Size | 3/8 inch |
| Torque Range | 5-80 Foot Pounds |
| Material | Heat Treated Chrome Vanadium Steel (Blend) |
| Finish | Chrome Plated Mirror Polish, Powder Coated |
| Measurement System | Foot Pounds (Metric conversion not applicable for this model's primary scale) |
| Compliance | Meets or exceeds ANSI specifications for hardness and torque |
| Included Components | 3/8" DR. Micro Adjusting Torque Wrench, Durable Storage Case |
| Item Weight | 1.13 kg |
| Product Dimensions | 2.54 x 2.54 x 2.54 cm (approximate) |
Warranty and Support
The ProGrade 11850 Micro Adjusting Torque Wrench comes with a Lifetime Guarantee. This guarantee covers defects in material and workmanship. Please note that this guarantee excludes calibration requirements, as calibration is a maintenance item and not a defect.
For warranty claims, technical support, or inquiries regarding re-calibration services, please contact Pro-Grade customer service. Refer to the product packaging or the official Pro-Grade website for the most current contact information.