1. Introduction
This instruction manual provides essential information for the safe and effective use of Hilti X-GN 20 MX 3/4" pins and associated fuel cells. These components are specifically designed for use with the Hilti GX120 gas-actuated fastening tool. Please read this manual thoroughly before using the product to ensure proper operation, maintenance, and safety.
2. Product Overview
The Hilti X-GN 20 MX system consists of 3/4" pins and a gas fuel cell, packaged together for convenience. Each original package contains 750 pins and one gas canister, intended for use with the Hilti GX120 fastening tool.

Figure 1: Hilti X-GN 20 MX 3/4" pins. These pins are designed for reliable fastening applications with compatible Hilti gas-actuated tools.

Figure 2: Hilti X-GN 20 MX pins alongside a Hilti GC 22 fuel cell. The fuel cell provides the necessary gas propellant for the fastening tool.
3. Setup and Loading
Before loading pins or fuel, ensure your Hilti GX120 fastening tool is clean and in good working condition. Always refer to the specific instruction manual for your GX120 tool for detailed loading procedures.
- Fuel Cell Installation:
- Open the fuel cell compartment on your GX120 tool.
- Insert the Hilti gas canister (e.g., GC 22) into the compartment, ensuring it is seated correctly.
- Close the compartment securely.
- Pin Loading:
- Open the magazine of your GX120 tool.
- Insert the strip of Hilti X-GN 20 MX 3/4" pins into the magazine, ensuring the pins are oriented correctly.
- Close the magazine securely.
- Verify that the pins feed smoothly.
Important: Only use Hilti-approved pins and fuel cells with Hilti tools to ensure optimal performance and safety.
4. Operating Instructions
Once the pins and fuel cell are loaded, and you have performed all necessary safety checks on your Hilti GX120 tool, you can proceed with fastening. Always follow the operating instructions provided with your specific GX120 tool.
- Safety First: Always wear appropriate personal protective equipment (PPE), including eye protection and hearing protection.
- Tool Activation: Press the tool firmly against the work surface at the desired fastening point.
- Firing: Activate the trigger mechanism of the GX120 tool. The gas propellant will drive the pin into the material.
- Post-Fastening: After each fastening, ensure the pin is securely seated. If not, do not attempt to re-fasten in the exact same spot.
- Fuel Cell Depletion: The tool's performance will decrease as the fuel cell depletes. Replace the fuel cell when fastening power is noticeably reduced or the tool stops firing.
- Pin Depletion: When the pin magazine is empty, reload with a new strip of pins.
5. Maintenance and Storage
Proper maintenance and storage ensure the longevity and reliability of your Hilti X-GN 20 MX pins and fuel cells.
- Storage Conditions: Store pins and fuel cells in a cool, dry place, away from direct sunlight, heat sources, and open flames.
- Temperature: Avoid storing in temperatures exceeding 50°C (122°F) as this can affect fuel cell performance and safety.
- Original Packaging: Keep pins in their original packaging until ready for use to protect them from moisture and damage.
- Disposal: Dispose of empty fuel cells according to local regulations for pressurized containers. Do not puncture or incinerate.
- Inspection: Before use, visually inspect pins for any signs of damage or corrosion. Do not use damaged pins.
6. Troubleshooting
If you encounter issues while using Hilti X-GN 20 MX pins and fuel with your GX120 tool, consider the following common checks:
- Tool Not Firing:
- Check if the fuel cell is empty or incorrectly inserted.
- Ensure the pin magazine is loaded correctly and pins are feeding.
- Verify that the tool is pressed firmly against the work surface.
- Refer to your Hilti GX120 tool manual for tool-specific troubleshooting.
- Pins Not Fastening Properly:
- Ensure you are using the correct pin length and type for the material.
- Check if the fuel cell is low, leading to insufficient fastening power.
- Inspect pins for damage or bending before loading.
For persistent issues, contact Hilti customer support or an authorized service center.
7. Specifications
Key specifications for the Hilti X-GN 20 MX pins and associated components:
| Feature | Detail |
|---|---|
| Brand | HILTI |
| Model Number | X-GN 20 MX |
| Fastener Type | Pin Bolt |
| Pin Length | 3/4" (0.75 Inches) |
| Thread Size | 3/4"-10 UNC |
| Head Style | Flat / Round |
| Metal Type | Stainless Steel |
| Manufacturer Grade | Grade 2 |
| Number of Pieces (per case) | 750 pins + 1 gas canister |
| Item Weight (case) | 2.91 pounds |
8. Safety Information
Always prioritize safety when handling fastening tools, pins, and fuel cells. Failure to follow safety instructions can result in serious injury or property damage.
- Personal Protective Equipment (PPE): Always wear safety glasses and hearing protection. Additional PPE may be required depending on the application.
- Ventilation: Use in well-ventilated areas to avoid inhalation of propellant gases.
- Flammable Materials: Keep fuel cells away from open flames, sparks, and other ignition sources. Do not smoke while handling fuel cells.
- Children and Unauthorized Persons: Keep pins and fuel cells out of reach of children and unauthorized personnel.
- Tool Specific Safety: Always adhere to the safety guidelines provided in the Hilti GX120 tool's instruction manual.
- Damaged Components: Never use damaged pins or fuel cells.
9. Warranty and Support
Hilti products are manufactured to high-quality standards. For information regarding product warranty, service, or technical support, please refer to the official Hilti website or contact your local Hilti representative. Ensure you have your product model number (X-GN 20 MX) and purchase details available when seeking support.
For further assistance, visit: www.hilti.com





