Introduction
This manual provides essential instructions for the safe and effective use of your Sunex 3670S 3/8-Inch Drive Internal Star Impact Socket Set. Please read this manual thoroughly before operation and retain it for future reference.
Product Overview
The Sunex 3670S is a 9-piece internal star impact socket set designed for durability and strength. Each socket is forged from chrome molybdenum alloy steel.
Components Included
- T20 Internal Star Impact Socket
- T25 Internal Star Impact Socket
- T27 Internal Star Impact Socket
- T30 Internal Star Impact Socket
- T40 Internal Star Impact Socket
- T45 Internal Star Impact Socket
- T47 Internal Star Impact Socket
- T50 Internal Star Impact Socket
- T55 Internal Star Impact Socket
- Heavy-duty blow-molded storage case
Product Features
- Material: Forged from chrome molybdenum alloy steel for strength and durability.
- Drive Size: 3/8-inch drive.
- Socket Type: Internal Star (Torx).
- Storage: Supplied in a durable blow-molded case for organization and protection.
Setup
No assembly is required for this socket set.
- Open the blow-molded case to access the sockets.
- Select the appropriate internal star socket size (T20, T25, T27, T30, T40, T45, T47, T50, T55) for your application.
- Attach the selected socket to a compatible 3/8-inch drive impact wrench, ratchet, or breaker bar. Ensure the socket is securely seated on the drive tool.

Image 1: The Sunex 3670S 3/8-Inch Drive Internal Star Impact Socket Set displayed in its red blow-molded storage case. The set includes nine internal star sockets ranging from T20 to T55.

Image 2: Two Sunex 3670S socket sets, one in a red case and one in a black case, illustrating that case colors may vary.
Operating Instructions
Always wear appropriate personal protective equipment (PPE), such as safety glasses, when using impact tools.
- Select Correct Socket: Identify the correct internal star (Torx) size required for the fastener. Using an incorrect size can damage both the fastener and the socket.
- Attach to Drive Tool: Securely attach the chosen socket to your 3/8-inch drive impact wrench, ratchet, or breaker bar. Ensure it clicks into place or is firmly seated.
- Position Socket: Place the socket squarely onto the fastener head, ensuring full engagement with all points of the star pattern.
- Apply Force:
- For loosening: Apply counter-clockwise force.
- For tightening: Apply clockwise force.
- When using an impact wrench, allow the tool to operate until the fastener is adequately tightened or loosened. Avoid over-tightening.
- Remove Socket: Once the task is complete, remove the socket from the fastener and then from the drive tool.
Caution: These sockets are designed for impact use. However, excessive force or improper use can still lead to damage or injury. Do not use damaged sockets.
Maintenance
- Cleaning: After each use, wipe sockets clean of dirt, grease, and debris. A mild solvent can be used if necessary, followed by drying.
- Inspection: Regularly inspect sockets for signs of wear, cracks, chips, or deformation. Discard any damaged sockets immediately to prevent failure during use.
- Storage: Store the sockets in their original blow-molded case in a dry environment to prevent rust and corrosion. This also helps in keeping the set organized and prevents loss.

Image 3: The closed blow-molded case for the Sunex 3670S socket set, with approximate dimensions of 5.0 inches (12 cm) indicated on the image. Proper storage helps maintain tool integrity.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Socket slips on fastener | Incorrect socket size; Worn fastener head; Worn socket. | Ensure correct socket size is used. Replace worn fasteners. Replace worn or damaged sockets. |
| Socket breaks | Excessive force; Improper angle; Defective socket (rare). | Use appropriate force for the task. Ensure socket is fully engaged and straight. Replace broken socket. |
| Rust on sockets | Improper storage; Exposure to moisture. | Store in a dry environment. Apply a light coat of rust preventative oil if storing for extended periods. |
Specifications
- Model: 3670S
- Brand: Sunex Tools
- Drive Size: 3/8-inch
- Socket Type: Internal Star (Torx) Impact
- Number of Pieces: 9
- Sizes Included: T20, T25, T27, T30, T40, T45, T47, T50, T55
- Material: Chrome Molybdenum Alloy Steel
- Item Weight: Approximately 1 pound (0.45 kg)
- Product Dimensions (Case): Approximately 2 x 2 x 2 inches (5.08 x 5.08 x 5.08 cm)
- UPC: 613364019344
Warranty and Support
Warranty Information: The manufacturer states that "Sets & Kits do not have warranty / see individual p". For specific warranty details on individual components or for further clarification, please refer to the official Sunex Tools website or contact their customer service directly.
Customer Support: For technical assistance, replacement parts, or any inquiries regarding your Sunex product, please visit the official Sunex Tools website or contact their customer support department.
Manufacturer: Sunex International
Website: www.sunextools.com