Read this documentation before initial operation or use. This is a prerequisite for safe, trouble-free handling and use of the product.
Observe the safety instructions and warnings in this documentation and on the product.
Always keep the operating instructions with the product and make sure that the operating instructions are with the product when it is given to other persons.
Explanation of symbols
Warnings alert persons to hazards that occur when handling or using the product. The following signal words are used:
Draws attention to imminent danger that will lead to serious personal injury or fatality.
Draws attention to a potential threat of danger that can lead to serious injury or fatality.
Draws attention to a potentially dangerous situation that could lead to personal injury or damage to the equipment or other property.
Symbols in the operating instructions
The following symbols are used in these operating instructions:
Comply with the operating instructions
Instructions for use and other useful information
Dealing with recyclable materials
Do not dispose of electric equipment and batteries as household waste
Hilti Li‑ion battery
Symbols in illustrations
The following symbols are used in illustrations:
These numbers refer to the illustrations at the beginning of these operating instructions.
The numbering reflects the sequence of operations shown in the illustrations and may deviate from the steps described in the text.
Item reference numbers are used in the overview illustration and refer to the numbers used in the key in the product overview section.
These characters are intended to specifically draw your attention to certain points when handling the product.
The following symbols can be used additionally in this documentation or on the product:
Wear eye protection
Wear protective gloves
Never use the battery as a striking tool.
Do not drop the battery. Never use a battery that has suffered an impact or is damaged in any other way.
products are designed for professional users and only trained, authorized personnel are permitted to operate, service and maintain the products. This personnel must be specifically informed about the possible hazards. The product and its ancillary equipment can present hazards if used incorrectly by untrained personnel or if used not in accordance with the intended use.
The type designation and serial number are printed on the rating plate.
Write down the serial number in the table below. You will be required to state the product details when contacting Hilti Service or your local Hilti organization to inquire about the product. Product information
GX fastening tool
Declaration of conformity
The manufacturer declares, on his sole responsibility, that the product described here complies with the applicable legislation and standards.
The technical documentation is filed here:
Hilti Entwicklungsgesellschaft mbH | Tool Certification | Hiltistrasse 6 | D-86916 Kaufering, Germany
Requirements to be met by users
The tool is intended for professional use.
The tool may be operated, serviced and repaired only by authorized, trained personnel. This personnel must be informed of any special hazards that may be encountered.
Stay alert, watch what you are doing and use common sense when operating a direct fastening tool. Do not use the tool when you are tired or under the influence of drugs, alcohol or medication. Take a break if you experience pain or feel unwell. A moment of inattention while operating tools may result in serious personal injury.
Avoid unfavorable body positions. Make sure you work from a safe stance and stay in balance at all times.
Wear non-skid shoes.
Never point the tool toward yourself or other persons.
Never press the nose of the tool against your hand or other part of your body, or against another person. Do not, under any circumstances, position your hand or other part of your body in the vicinity of the nosepiece. Pressing the nosepiece against a part of the body can lead to severe injury, due to unintentional actuation and firing of the fastener.
Do not place your free hand directly behind the material being fastened.
Do not position your free hand in the vicinity of the nosepiece.
Keep other people away from the working area, especially children.
Keep the arms slightly bent while operating the tool (do not straighten the arms).
Both the user and any other persons in the vicinity must wear suitable personal protective equipment including adequate eye protection, ear protectors and a hard hat.
Careful handling and use of direct fastening tools.
Never leave a loaded tool unattended.
Remove the gas can from the tool before transporting the tool.
Always unload the tool (remove the battery, gas can and nails) before cleaning, servicing, and repair work, before a break in your work, and for storing the tool.
Store unused gas cans and tools that are not currently being used in a dry place where they are not exposed to moisture and excessive temperatures.
To ensure that the tool functions faultlessly and as intended, always check the tool and accessories for possible damage before use. Check that moving parts function faultlessly, without sticking, and that no parts are damaged. All parts must be fitted correctly and fulfill all conditions necessary for correct operation of the tool. Damaged protective devices and parts that are not included in the service package available as an accessory (see the section headed "Care of the tool") must be properly repaired or replaced by Hilti Service unless otherwise stated in the operating instructions.
Always hold the tool firmly when making a fastening. This will reduce the possibility of the fastener being deflected by the material into which it is driven.
Never attempt to re-drive a fastener. Never drive a fastener on top of another previously-driven fastener. This may lead to fastener breakage and jamming.
Always observe the application guidelines. For more information, consult the Hilit Fastening Technology Manual.
Do not pull the nosepiece back with your hand or with an object. Under certain circumstances, this could make the tool ready to fire. When the tool is ready to fire, fasteners or the piston could be driven inadvertently into parts of the body.
Make sure that the workplace is well lit.
Operate the tool only in well ventilated working areas.
Drive fasteners only into wood and other suitable wood materials (see "Intended use"): Driving a fastener into other materials may cause the fastener to break, shatter or to be driven right through.
Before driving fasteners, check that no one is present immediately behind or below the working surface.
Keep the workplace tidy. Objects which could cause injury should be removed from the working area. Untidiness at the workplace can lead to accidents.
Keep the grips dry, clean and free from oil and grease.
Take the influences of the surrounding area into account. Do not expose the appliance to rain or snow and do not use it in damp or wet conditions. Do not use the appliance where there is a risk of fire of explosion.
Concealed electrical cables or gas and water pipes present a serious hazard if damaged while you are working. Therefore, check the working area before you begin, e.g. using a metal detector. External metal parts of the appliance or machine may become live, for example, when an electric cable is damaged accidentally.
Only hold the tool by its insulated gripping surfaces if carrying out work where the insert tool may come into contact with concealed wiring. Metal parts of the power tool can also become live, resulting in electric shock, if contact is made with a live cable.
Thermal safety rules
If the tool overheats, remove the gas can and allow the tool to cool down. Do not exceed the specified maximum fastener driving rate.
Always wear gloves if cleaning or maintenance has to be carried out before the tool has been allowed to cool down.
Careful handling and use of gas cans.
Read the safety data sheet for the gas can for information about use, care and maintenance and first-aid measures.
Careful handling and use of batteries
Observe the special guidelines applicable to the transport, storage and use of lithium-ion batteries.
Do not expose batteries to high temperatures, direct sunlight or fire.
Do not disassemble, crush or incinerate batteries and do not subject them to temperatures over 80 °C (176 °F).
Do not use or charge batteries that have suffered mechanical impact, have been dropped from a height or show signs of damage. In this case, always contact your HiltiService .
If the battery is too hot to touch it may be defective. Put the battery in a place where it is clearly visible and where there is no risk of fire, at an adequate distance from flammable materials. Allow the battery to cool down. If it is still too hot to touch after an hour, the battery is faulty. Contact HiltiService .
Gas can compartment
Adapter for surface protection
The tool is for fastening wood to wood using specially manufactured fasteners. The tool is suitable for use with solid wood, laminated timber, plywood, chipboard materials (e.g. coarse oriented-strand board), fiberboard materials (e.g. medium density fiberboard), and veneer materials (e.g. Multiplex). The tool is intended for use by professionals in the timber construction industry. For usage recommendations, consult the Hilti Fastening Technology Manual.
The tool, gas can and fasteners form a single technical unit. This means that trouble-free fastening with this tool can be ensured only when it is used together with the Hilti nails and Hilti gas cans specially manufactured for it. The fastening and application recommendations made by Hilti apply only when these conditions are observed. The tool is for hand-held use only. Do not tamper with or attempt to make alterations to the machine.
Use only Hilti Li-ion batteries of the B7 series with this product.
For these batteries, use only the C7 battery charger approved by Hilti . More information is available from your Hilti Store or from www.hilti.group
This product is equipped with Bluetooth (optional).
Bluetooth is a wireless data transfer system by which the two Bluetooth-enabled products can communicate with each other over a short distance.
The tool has a hibernation mode to protect the Li-ion battery from deep discharge. The tool switches itself off completely, automatically, if unused for 120 minutes.
To restore operational readiness, briefly remove the battery and reinsert it (battery reset).
Tool in case, 2 batteries, charger, cleaning cloth, operating instructions.
Other system products approved for use with this product can be found at your local
Hilti Store or at:
System components for operating the tool
The following items are required to use the tool: Tool, charged B7 / 1.5 Li-ion battery, GC 31 or GC 32 gas can and GX-WF nails for wood.
Direct fastening tool
Nailing to squared timber
Weight (including battery)
384 mm x 134 mm x 381 mm
Maximum magazine capacity
Maximum fastener driving rate in continuous operation
Work with interruptions
up to 3 fastenings per second
Caliber (gas can)
Operating / ambient temperature with GC 31 gas can
−5 ℃ …45 ℃
Operating / ambient temperature with GC 32 gas can
−10 ℃ …45 ℃
50 mm …90 mm
2.8 mm …3.1 mm
B 7/1.5 Li-ion battery
Noise information and acceleration in accordance with EN 15895
The sound pressure and vibration values given in these instructions have been measured in accordance with a standardized test and may be used to compare one fastening tool with another. They may be used for a preliminary assessment of exposure. The data given represents the main applications of the fastening tool. However, if the fastening tool is used for different applications, with different accessories or is poorly maintained, the data may vary. This may significantly increase exposure over the total working period. An estimation of the level of exposure should also take into account the periods of time when the tool is not actually in use. This may significantly reduce exposure over the total working period. Prescribe additional safety measures to protect the operator from the effects of noise and/or vibration, such as: maintenance of the direct fastening tool and its additional equipment or accessories, keeping the hands warm, organization of work patterns.
Emission sound pressure level at the workplace (LpA, 1s)
Peak sound pressure level at the workplace (LpC, peak)
138 dB (C)
Sound power level (LWA, 1S)
Uncertainty, noise (KpA)
Energy-equivalent acceleration (ahw, RMS(3))
Results, nail size 90x3.1 mm in solid spruce timber <2.5 m/s2
Hazard due to use of the wrong fasteners Use of the wrong fasteners can lead to tool malfunctions and/or injuries.
In particular, make sure that you are using suitable fasteners collated at the correct angle in the magazine.
There is a retention spring in the bottom of the magazine. If the maximum number of fasteners in the magazine is exceeded, the last strip of nails to be inserted cannot be held back by this spring. Remove the strip of nails that was last inserted.
Insert the fasteners into the magazine from below, pointing in the right direction.
Injury due to inattention Inattention can result in your fingers being trapped.
Move the nail pusher carefully, pull it steadily back over the nails, until it snaps into place at the bottom end of the nail strip.
Push the fasteners as far as they will go toward the nosepiece.
The nail strip could suffer damage if the nail pusher is allowed to strike it with force. Do not allow the nail pusher to strike the nail strip with force.
Preparing the gas can
Risk of accident Risk of injury by escaping gas.
Gas from the gas can is harmful to the lungs, skin and eyes. Keep the metering valve away from your face and eyes.
The pressurized liquefied gas can escape and endanger you and others. Never remove the metering valve from a prepared gas can or a used gas can.
Transport lock for gas can.
The gas can is fitted with a transport lock. Remove the lock before inserting the gas can into the tool.
Removing the transport lock
Lift the safety cap and metering valve off the gas can.
Disconnect the safety cap from the metering valve.
Insert the metering valve with the front hooking groove into the gas can notch.
The metering valve has a front and a rear hooking groove.
Press the rear hooking groove firmly over the lip of the gas can until the metering valve snaps into place on the can.
Inserting the gas can
Open the cover of the gas can compartment by pressing it upwards and to the rear.
Push the gas can and metering valve into the red adapter.
Close the cover by pressing it down with your thumb until the latch snaps into engagement.
Inserting the battery
Risk of damage Incorrect operation of the equipment can lead to damage.
Read the operating instructions for the C 7 charger for instructions on charging the battery and for further information about use and care of the battery.
A falling battery presents a hazard. If the battery is not secured correctly it may drop out and fall while the work is in progress.
Check that the battery is seated securely.
Risk of injury When inserting the battery, there is a risk of pinching the skin.
Take care when inserting the battery.
Before inserting the battery, make sure that the battery contacts and the contacts in the tool are free of foreign bodies.
From below, push the battery into the opening at the end of the grip until it snaps into place. The LED briefly lights up in green to signal that the tool is ready for use.
Charge the battery fully before using the tool for the first time.
Battery state of charge
Action to be taken
Green LED is on/flashes
The battery is ready for use.
Drop in battery voltage. Change the battery soon.
Red LED is on/flashes
Battery voltage is no longer adequate for operation of the tool. Change the battery.
Switch to the second battery, at the latest when the LED on the tool shows red. Recharge the battery immediately so that it is ready for reuse.
The battery is too cold (<-15 °C / <5 °F) or too hot (>60 °C / >140 °F) and the fan does not start. Remove the battery and allow it to warm up or cool down to the required temperature.
No LED lit up or flashing
The battery voltage is below the threshold value. Charge the battery.
Settings at the nosepiece
You can control the penetration depth of the nails by changing the position of the nosepiece. Use the adjusting wheel for this purpose.
Protecting sensitive surfaces
Risk of injury You might inadvertently trigger a misfire.
Remove the battery and the gas can from the tool before installing or removing the surface protector.
Use the adapter for surface protection when working on visible surfaces that are easily marked, for example building facades.
The surface protection adapter reduces the possibility of the nosepiece leaving marks on the surface of the wood.
Unintentional firing safety device
Never operate the product without the unintentional firing safety device (sliding sleeve).
The tool has a safety device to prevent it from being triggered incorrectly. The sliding sleeve prevents the nosepiece from being pushed back deliberately or unknowingly. This prevents accidental releases.
You can drive nails only if there are more than 5 nails in the magazine.
Hold the tool securely. Avoid resilient materials.
Pull the trigger only after the tool has been fully pressed against the working surface.
Do not release the trigger until the nail has been driven fully into the material.
Position the nosepiece on the working surface and press the tool against the surface until the nosepiece is fully compressed.
Drive the fastener by pulling the trigger.
Release the trigger and lift the tool completely clear of the surface.
Unloading the tool
Removing the battery
Store the battery in a cool and dry place. Never store the battery where it is exposed to direct sunlight or sources of heat, e.g. on heaters / radiators or behind glass. At the end of their useful life, batteries must be disposed of safely and correctly to avoid environmental pollution.
Press both battery release buttons.
Pull the battery downwards out of the power tool.
Removing the gas can
Open the gas can compartment cover.
Remove the gas can.
Close the gas can compartment.
Unloading nail strips
Release the catch on the nail pusher by pressing the black button.
Carefully allow the pusher to slide slowly toward the nosepiece until it stops.
Allow the nails in the magazine to slide downwards.
Press the internal pawl on the bottom end of the magazine. You can now completely remove the nails from the magazine.
Risk of injury A falling tool can injure you and/or others.
Make sure that the tool attached to the belt hook is secure.
You can use the tool hook to hook the tool to your belt, a ladder, or a roof batten. Press the belt hook towards the tool in the direction of the longitudinal axis of the magazine. This releases the belt hook from its locked position and it can then be swung in or out.
Care and maintenance
Care and maintenance of the tool
The tool must be unloaded (remove the gas can and fastener from the tool) before carrying out cleaning or maintenance. Completely remove the battery, gas can and nail strip from the tool.
Clean the outside of the power tool at regular intervals with a slightly damp cloth.
Never operate the tool when the ventilation slots are blocked. Clean the ventilation slots carefully using a dry brush.
Do not permit moisture or foreign objects to enter the interior of the tool or the battery.
Remove the tool from its case and allow it to dry out if moisture has entered the tool. To do this, remove the battery and keep the gas can compartment cover at the rear in the open position.
Always keep the grip surfaces of the appliance free from oil and grease.
Do not use a spray, steam pressure cleaning equipment or running water for cleaning.
Do not use cleaning agents containing silicone.
Make sure that there is no oil or grease on the battery contacts.
Repair of the power tool
Regularly check all external parts of the tool for damage and check that all controls are in full working order. Do not operate the tool if parts are damaged or if controls are not in full working order.
If damage occurs, have the tool repaired by
Hilti Service only.
Cleaning the appliance
The tool needs regular maintenance and cleaning. We recommend that the tool is cleaned, at the latest, after making 40,000 fastenings. The tool should also be cleaned if malfunctions occur frequently, e.g. misfiring or firing without a nail being driven.
Clean the power tool at regular intervals. Use only Hilti products or products of comparable quality for cleaning.
The required materials, tools, and documentation are available from Hilti as accessories.
You can have the necessary maintenance work carried out by Hilti . To do so, contact your local Hilti branch.
Cleaning the piston
Dirt and remains of the nail collation strip may hinder piston movement. Malfunctions occur increasingly, i.e. the tool is triggered but no fastener is driven. In this case, the piston should be cleaned as follows:
Remove the battery, the gas can and the fasteners from the tool.
Use a screwdriver to push the piston back as far as it will go.
Spray cleaning fluid generously into the tool nosepiece.
First replace the battery and then the gas can.
Pull the nail pusher back by hand and then trigger the tool five times, without driving fasteners, with the nosepiece pressed against a suitable surface (see the section headed "Intended use").
Reload the fasteners and continue working with the tool in the usual way.
If necessary, repeat steps 1-6.
Action to be taken
The tool is fired frequently without a fastener loaded
Working speed too high
Adhere to the maximum fastener driving rate.
The tool is not pressed fully against the working surface and/or the trigger is not pulled fully.
Press the tool fully into contact with the workpiece and do not release the trigger until the nail has been fully driven.
Tool has reached its target life of 40,000 fasteners driven.
The tool can not be pressed against the work surface
Less than 5 nails in the magazine
Reload the nail strip.
Remove the battery and the gas can.
N.B.: Do not carry out any maintenance work without fully unloading the tool.
Remove jammed nails.
Frequent transport malfunctions with nails in plastic strips
Damaged magazine strip
Hold the nail pusher firmly when operating.
Risk of injury due to incorrect disposal! Health hazards due to escaping gases or liquids.
DO NOT send batteries through the mail!
Cover the terminals with a non-conductive material (such as electrical tape) to prevent short circuiting.
Dispose of your battery out of the reach of children.
Dispose of the battery at your Hilti Store , or consult your local governmental garbage disposal or public health and safety resources for disposal instructions.
Most of the materials from which
Hilti products are manufactured can be recycled. The materials must be correctly separated before they can be recycled. In many countries, your old tools, machines or appliances can be returned to
Hilti for recycling. Ask
Hilti Service or your Hilti sales representative for further information.
Do not dispose of power tools, electronic equipment or batteries as household waste!
Please contact your local Hilti representative if you have questions about the warranty conditions.
China RoHS (Restriction of Hazardous Substances)
This table is valid for the China market.
Hilti Li-ion batteries
Instructions for Use and OperationThis documentation uses the term battery to describe rechargeable Hilti Li-ion battery packs containing several Li-Ion cells joined together. These batteries are to be used in Hilti power tools exclusively. When using Hilti power tools, use
Hilti original battery packs!
Hilti batteries are state of the art and are equipped with cell management and cell protection systems.
DescriptionThe batteries are composed of cells that contain lithium-ion storage materials that are capable providing high specific energy density. Unlike NiMH and NiCd batteries, Li-ion batteries have a minimal memory effect, but they are extremely susceptible to external impact, deep discharge, and high temperatures. See
Safety WARNING Find our battery-powered products at your
Hilti Store or at:
www.hilti.group | USA:
Batteries must not be modified or tampered with!
Never use recycled or repaired batteries conducted by non-Hilti companies.
Do not use or charge batteries that have suffered mechanical impact, have been dropped from a height or show signs of damage. Examine your batteries regularly for signs of damage, such as shredding, cuts or punctures.
Never use the battery or a battery-operated power tool as a hammer.
Avoid eye or skin contact with leaking liquids!
See What to do in case of damaged batteries
Damaged batteries can leak fluid which may moisten adjacent objects. Clean these objects with warm soapy water and replace the damaged batteries.
See What to do in case of damaged batteries
Never expose batteries to elevated temperature, sparking, or an open flame because the battery may explode.
Do not touch the battery poles with your fingers, tools, jewelry, or other metallic objects because this may cause a short circuit, electrical shock, burns or explosions.
Keep batteries away from rain or moisture. Penetrating moisture can cause short circuits, electrical shock, burns or explosions.
Only use chargers and power tools approved for the specific battery type. Read and follow the instructions in the respective user manuals.
Do not store or use the battery in explosion-prone environments containing combustible liquids or gases. An unexpected battery malfunction can cause an explosion under those conditions.
What to do in case of damaged batteries
If a Hilti battery is found to be damaged, contact your Hilti service partner.
If a battery is leaking, use safety goggles and gloves to avoid direct eye or skin contact.
To store a damaged battery, place the battery in a non-flammable container and cover the battery with dry sand, chalk powder (CaCO3) or silicate (Vermiculite). Then, close the lid air-tight and store the container away from flammable gases, liquids, or objects.
Dispose of the container at your Hilti Store , or consult your local governmental garbage disposal or public health and safety resources for disposal instructions. Do not ship or mail damaged batteries!
Use a chemical spill cleanup kit to remove leaked battery fluid.
What to do in case of dysfunctional batteries
Watch for abnormal battery behavior, such as faulty charging or unusually long charging times, noticeable power loss, unusual charger LED activity, or leaking fluids. These are signs of an internal problem.
If you suspect an internal battery problem, contact your Hilti service partner.
Should the battery be in operational or no longer chargeable or leaking fluid, dispose of it as described above.
See What to do in case of damaged batteries .
What to do in case of a battery fire
Battery fire hazard! A burning battery releases hazardous and potentially explosive liquids and fumes that can lead to corrosion injuries, burns or explosions.
Wear your personal protective equipment when you tackle a battery fire.
Provide sufficient venting to permit hazardous and potentially explosive fumes to escape.
Leave the room immediately in case of intense smoke emission.
Consult a doctor in case of any skin or respiratory irritation.
Battery fires should be extinguished with water. Powder fire extinguishers and fire blankets are ineffective with Li-Ion batteries. Fires started by a lithium-ion battery in nearby materials can be extinguished with any appropriate extinguishing agent.
Do not try to move large quantities of damaged, burning, or leaking batteries. Instead, remove surrounding materials and isolate the batteries. If the scale of the fire is larger than can be extinguished with available methods, contact the nearest firefighting authority.
In the case of a single burning battery,:
Scoop the battery up with a shovel and drop it into a bucket of water, which will reduce the risk of igniting adjacent cells that have not yet reached run-away temperature.
Wait for the battery to cool down completely.
See What to do in case of damaged batteries .
Shipping and storage
Ambient operating temperature to be kept between -17°C and +60°C / 1°F and 140°F.
Storage temperature to be kept between -20°C and +40°C / -4°F and 104°F.
Do not store batteries on the charger. Separate battery from charger after use.
Store batteries in a cool and dry place. Cool storage will increase battery life. Never store batteries where they are exposed to direct sunlight, on sources of heat or behind glass.
Batteries should not be sent through the mail. Consult your shipper for instructions on how to ship undamaged batteries.
Do not transport batteries in bulk, loosely packaged. During transport, batteries should be protected from excessive shock and vibration and isolated from any conductive materials or other batteries that may come in contact with the terminals and cause a short circuit.
Maintenance and disposal
Keep the battery free of oil and grease. If the battery is exposed to oil or grease, remove the contamination with a clean dry rag.
Never use a battery with clogged venting slots. Clean the venting slots carefully with a soft brush to prevent debris from entering the battery.
Prevent unnecessary exposure of the battery to dust or debris and never subject the battery to soaking moisture (e.g., submerged in water or left out in the rain).
If the battery becomes dirty, clean it with a soft brush or clean, dry rag.
If a battery is exposed to soaking moisture, treat it as a damaged battery and isolate it in a non-flammable container.
See What to do in case of damaged batteries
Improper disposal may cause health hazards from leaking gases or fluids. Dispose of the battery at your Hilti Store , or consult your local garbage disposal or public health and safety resources for disposal instructions. Do not ship or mail damaged batteries!
Do not dispose of batteries as household waste.
Dispose of your battery out of the reach of children. Cover the terminals with a non-conductive material (such as electrical tape) to prevent short circuiting.