1. Introduction
Thank you for choosing the VESSEL SP-1135B Air Impact Wrench. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your new tool. Please read this manual thoroughly before use and retain it for future reference.
2. Safety Information
Always observe basic safety precautions to reduce the risk of personal injury and damage to the tool. Failure to follow these instructions may result in serious injury.
- Eye Protection: Always wear ANSI-approved safety goggles or safety glasses with side shields when operating this tool.
- Hearing Protection: Wear hearing protection during extended use to prevent hearing damage.
- Hand Protection: Wear appropriate gloves to protect hands from vibration and potential pinch points.
- Air Supply: Ensure the air supply is clean, dry, and regulated to the specified pressure. Never exceed the maximum operating pressure.
- Hose Safety: Inspect air hoses for cuts, wear, or damage before each use. Keep hoses away from heat, oil, and sharp edges.
- Work Area: Keep your work area clean, well-lit, and free of clutter. Ensure proper ventilation.
- Secure Workpiece: Always secure the workpiece firmly before operating the impact wrench.
- Avoid Accidental Starting: Ensure the tool is disconnected from the air supply when not in use, before changing accessories, or performing maintenance.
- Proper Footing: Maintain proper footing and balance at all times. Do not overreach.
3. Product Overview
The VESSEL SP-1135B is a compact and powerful air impact wrench designed for general bolting applications, such as bench work, engine, and transmission gear assembly. It features a 0.4 inch (9.5 mm) square drive for versatile socket compatibility.
Key Features:
- Left and right rotation switching with a push button for one-handed operation.
- Stepless throttle allows precise rotation speed adjustment with the trigger.
- Compact and lightweight design for improved maneuverability.
- Durable powder-coated finish.

Figure 3.1: The VESSEL SP-1135B Air Impact Wrench, highlighting its compact design and ergonomic grip. The 'SP AIR' logo is visible on the side.

Figure 3.2: This diagram illustrates the key dimensions of the VESSEL SP-1135B Air Impact Wrench, including its length of 138mm and height of 160mm, providing a clear understanding of its physical size.

Figure 3.3: A detailed view of the push-button mechanism on the VESSEL SP-1135B Air Impact Wrench, which allows for easy one-handed switching between forward and reverse rotation.

Figure 3.4: This image displays an exploded view of the internal components of the VESSEL SP-1135B Air Impact Wrench, showing the various parts that contribute to its impact mechanism and drive system.
4. Setup
Before operating the impact wrench, ensure proper setup for safe and efficient use.
4.1 Air Supply Connection
- Ensure your air compressor is capable of providing the required air pressure and volume (see Specifications).
- Install a 1/4" NPT hose fitting (included) onto the air inlet of the impact wrench. Use thread sealant tape for a secure, leak-free connection.
- Connect a suitable air hose to the fitting. Ensure the hose is rated for the operating pressure and is free from damage.
- Connect the other end of the air hose to your air compressor's regulated output.
- Set the air compressor regulator to the recommended usable air pressure of 0.62 MPa (approximately 90 PSI). Do not exceed this pressure.
4.2 Lubrication
Air tools require regular lubrication to maintain performance and extend lifespan. Add a few drops of pneumatic tool oil into the air inlet before each use, or use an in-line oiler.
4.3 Socket Installation
Select the appropriate 0.4 inch (9.5 mm) square drive impact socket for your application. Push the socket firmly onto the square drive anvil until it locks into place. Ensure the socket is securely attached before operation.
5. Operation
Follow these steps for safe and effective operation of your VESSEL SP-1135B Air Impact Wrench.
5.1 Starting the Tool
With the air supply connected and regulated, press the trigger to start the tool. The stepless throttle allows you to control the rotational speed by varying the pressure on the trigger.
5.2 Forward/Reverse Rotation
The tool features a push-button switch for changing the direction of rotation. This switch is conveniently located for one-handed operation. Press the button to toggle between forward (tightening) and reverse (loosening) modes.
5.3 Tightening and Loosening Bolts
- Ensure the correct socket is securely attached to the anvil.
- Place the socket squarely onto the fastener.
- For tightening, select the forward rotation. For loosening, select reverse rotation.
- Press the trigger gradually to start the tool. Apply steady pressure to the tool to keep the socket engaged with the fastener.
- Release the trigger to stop the tool.
The tightening torque range for this tool is 7 - 90 Nm. For critical applications requiring precise torque, always use a calibrated torque wrench for final tightening.
6. Maintenance
Regular maintenance ensures optimal performance and extends the life of your impact wrench.
6.1 Daily Maintenance
- Lubrication: Add 5-10 drops of pneumatic tool oil into the air inlet before each use.
- Air Filter: Check and drain any moisture from your air compressor's air filter/water trap.
- Hose Inspection: Inspect air hoses and connections for leaks, wear, or damage. Replace any damaged components immediately.
6.2 General Cleaning and Storage
- Disconnect the tool from the air supply before cleaning.
- Wipe down the tool with a clean, dry cloth. Do not use harsh solvents that could damage the tool's finish or internal components.
- Store the tool in a clean, dry environment, away from extreme temperatures and direct sunlight.
7. Troubleshooting
If you encounter issues with your impact wrench, refer to the following table for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not operate or has low power. | Low air pressure; insufficient air volume; air leaks; lack of lubrication; clogged air inlet filter. | Check air compressor pressure and regulator setting; ensure hose diameter is adequate; check all connections for leaks; add pneumatic tool oil; clean air inlet. |
| Excessive air leakage. | Loose fittings; damaged O-rings or seals; worn hose. | Tighten all connections; replace damaged O-rings/seals; replace worn air hose. |
| Tool runs but does not impact. | Internal mechanism issue; lack of lubrication. | Add pneumatic tool oil; if problem persists, contact qualified service personnel. |
If you cannot resolve the issue using this guide, please contact VESSEL customer support.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | SP-1135B |
| Square Drive | 0.4 inches (9.5 mm) |
| Compatible Bolt Diameter | 0.4 inches (10 mm) |
| Tightening Torque Range | 7 - 90 Nm |
| No-Load Rotational Speed | 12,000 RPM |
| Usable Air Pressure | 0.62 MPa (approx. 90 PSI) |
| Hose Inlet | 1/4" NPT |
| Exhaust Type | Rear Exhaust |
| Total Length | 5.4 inches (138 mm) |
| Weight | 1.3 kg (2.86 pounds) |
| Power Source | Air |
| Finish Type | Powder Coated |
9. Warranty and Support
For information regarding product warranty, service, or technical support, please contact VESSEL customer service or visit the official VESSEL website. Please have your model number (SP-1135B) and purchase details available when contacting support.
You can find more information about VESSEL products at the VESSEL Store on Amazon.