STR 4-22 (01)

About these operating instructions

• Warning! Read and understand all accompanying documentation, including but not limited to instructions, safety warnings, illustrations, and specifications provided with this product. Familiarize yourself with all the instructions, safety warnings, illustrations, specifications, components, and functions of the product before use. Failure to do so may result in electric shock, fire, and/or serious injury. Save all warnings and instructions for future reference.
  
• 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 accompanying documentation corresponds to the current state of the art at the time of printing. Please always check for the latest version on the product’s page on Hilti’s website. To do this, follow the link or scan the QR code in this documentation, marked with the symbol .
  
• Ensure that these operating instructions are with the product when it is given to other persons.
  

Explanation of symbols

Warnings

Warnings alert persons to hazards that occur when handling or using the product. The following signal words are used:

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
	Hilti charger

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.

Product-dependent symbols

General symbols

Symbols used in relation to the product.

	Direct current (DC)
	Use a hex key (4 mm) to secure the cutting edges.
	Before starting work, check the cutting edge securing screws.
	The product supports near-field communication (NFC) technology compatible with iOS and Android platforms.
	Li-ion battery
	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.

Obligation symbols

Obligation symbols indicate "must do" actions.

Wear eye protection

Warning symbols

Warning symbols are warnings of hazards.

Warning: avoid hand injuries

General power tool safety warnings

WARNING Read all safety warnings, instructions, illustrations and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
Work area safety

• Keep work area clean and well lit. Cluttered or dark areas invite accidents.
  
• Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
  
• Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
  

Electrical safety

• Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
  
• Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.
  
• Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
  
• Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.
  
• When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
  
• If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.
  

Personal safety

• Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.
  
• Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hat or hearing protection used for appropriate conditions will reduce personal injuries.
  
• Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energising power tools that have the switch on invites accidents.
  
• Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
  
• Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
  
• Dress properly. Do not wear loose clothing or jewellery. Keep your hair and clothing away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts.
  
• If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.
  
• Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.
  

Power tool use and care

• Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
  
• Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
  
• Disconnect the plug from the power source and/or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
  
• Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
  
• Maintain power tools and accessories. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
  
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
  
• Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
  
• Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.
  

Battery tool use and care

• Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
  
• Use power tools only with specifically designated battery packs. Use of any other battery packs may create a risk of injury and fire.
  
• When battery pack is not in use, keep it away from other metal objects, like paper clips, coins, keys, nails, screws or other small metal objects, that can make a connection from one terminal to another. Shorting the battery terminals together may cause burns or a fire.
  
• Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.
  
• Do not use a battery pack or tool that is damaged or modified. Damaged or modified batteries may exhibit unpredictable behaviour resulting in fire, explosion or risk of injury.
  
• Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or temperature above 130° C (265 °F) may cause explosion.
  
• Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions. Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.
  

Service

• Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.
  
• Never service damaged battery packs. Service of battery packs should only be performed by the manufacturer or authorized service providers.
  

Additional safety instructions

• Use the product and accessories only when they are in perfect working order.
  
• Never tamper with or modify the product or accessories in any way.
  
• Risk of injury by falling tools and/or accessories. Before starting work, check that the battery and installed accessories are secure.
  
• Wear protective gloves when using the power tool and when changing accessory tools.
  
• Before you lay down the power tool, wait until the power tool has come to a complete stop.
  
• Never start the power tool while carrying it around.
  
• Keep bystanders a safe distance away from the work area. Anyone entering the work area must wear personal protective equipment. Fragments of the workpiece or of a broken accessory tool may fly off and cause injury beyond the immediate area of operation.
  
• Keep children clear of your work area.
  
• Keep the air vents clear at all times. Risk of burn injuries due to blocked air vents!
  
• Do not look directly into the light source (LED) of the product and do not aim the beam at other persons’ faces. Risk of dazzling or eye damage.
  
• Before starting work, check the cutting blades and cutting arms for visible damage.
  
• When the product is in operation, keep your body and parts of the body well away from the cutting blades and moving parts. This will help prevent injury due to trapping or to flying splinters.
  
• Do not switch the power tool on until it is at the workplace and has been brought to its working position.
  
• Always use the waste container for overhead work. Before starting work, make sure that the lid of the waste container is closed.
  
• Hold the power tool in such a way that the offcuts from the threaded rods cannot fall out of the front of the waste container.
  
• Do not exceed the maximum offcut length that the waste container can accommodate.
  
• Make sure that the offcuts from the threaded rods cannot fall out and that you cannot injury yourself on sharp-edged burrs. Use the waste container whenever possible.
  
• Threaded rods cut to length and also the offcuts can be hot and sharp-edged. Wear protective gloves when you have to touch the threaded rod or the offcut.
  
• The securing screws of the cutting edges can work loose over a lengthy period of operation. Before each use, check that the securing screws are correctly tightened; tighten the securing screws if necessary.
  
• Stop working as soon as the housing of the power tool gets hot. Allow the power tool to cool down and then resume working. Do not work continuously without breaks over several consecutive battery changes or battery charges.
  
• Before each use, check that the cutting edges are securely installed on the tool body.
  

Careful handling and use of batteries

• Comply with the following safety instructions for the safe handling and use of Li-ion batteries. Failure to comply can lead to skin irritation, severe corrosive injury, chemical burns, fire and/or explosion.
  
• Use only batteries that are in perfect working order.
  
• Treat batteries with care in order to avoid damage and prevent leakage of fluids that are extremely harmful to health!
  
• Do not under any circumstances modify or tamper with batteries!
  
• Do not disassemble, crush or incinerate batteries and do not subject them to temperatures over 80 °C (176 °F).
  
• Never use or charge a battery that has suffered an impact or been damaged in any other way. Check your batteries regularly for signs of damage.
  
• Never use recycled or repaired batteries.
  
• Never use the battery or a battery-operated power tool as a striking tool.
  
• Never expose batteries to the direct rays of the sun, elevated temperature, sparking, or open flame. This can lead to explosions.
  
• Do not touch the battery poles with your fingers, tools, jewelry, or other electrically conductive objects. This can damage the battery and also cause material damage and personal injury.
  
• Keep batteries away from rain, moisture and liquids. Penetrating moisture can cause short circuits, electric shock, burns, fire and explosions.
  
• Use only chargers and power tools approved for the specific battery type. Read and follow the relevant operating instructions.
  
• Do not use or store the battery in explosive environments.
  
• 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. Consult Hilti Service or read the document entitled "Instructions on safety and use for Hilti Li-ion batteries".
  
  Observe the special guidelines applicable to the transport, storage and use of lithium-ion batteries.
  Read the instructions on safety and use of Hilti Li-ion batteries that you can access by scanning the QR code at the end of these operating instructions.
  

Product overview

1. Cutting arm (movable)
   
2. Cutting arm (stationary)
   
3. Release button (depth gauge)
   
4. Depth gauge
   
5. Function selector switch
   
6. Control switch
   
7. Grip
   
8. Release button, battery
   
9. Battery status indicator
   
10. Scaffold hook
    
11. Release button (mounting adapter)
    
12. Mounting adapter for accessories
    
13. Parallel guide with M6 adapter
    
14. Waste container for offcuts
    
15. Work-area light (LED)
    
16. Cutting blade
    
17. Hex key (4 mm)
    
18. Installation slot for accessories
    

Intended use

The product described is a cordless (battery-powered) threaded-rod cutter. It is designed for cutting threaded rods of sizes:

• W3/8 (mild steel, galvanized, or stainless steel)

• M6 and M8 (mild steel, galvanized, or stainless steel)

• M10 (only mild steel, galvanized)

The product is not suitable for cutting stainless steel M10 threaded rods.

• For this product, use only Hilti Nuron lithium-ion batteries of the B 22 series. For optimum performance, Hilti recommends the batteries stated in this table for this product.

• For these batteries, use only Hilti chargers of the type series stated in this table.

Items supplied

Cordless threaded-rod cutter, waste container, depth gauge, parallel guide, set of cutting edges, hex key, operating instructions

Status indicators of the Li‑ion battery

Hilti Nuron Li-ion batteries can indicate state of charge, fault messages and the battery's state of health.

Indicators for state of charge and fault messages

Short-press the release button of the battery to get whichever of the following status indications is applicable at the time.
State of charge and, if applicable, faults are indicated constantly as long as the connected product is switched on.

Status	Meaning
Four (4) LEDs show constantly green	State of charge: 100 % to 71 %
Three (3) LEDs show constantly green	State of charge: 70 % to 51 %
Two (2) LEDs show constantly green	State of charge: 50 % to 26 %
One (1) LED shows constantly green	State of charge: 25 % to 10 %
One (1) LED slow-flashes green	State of charge: < 10 %
One (1) LED quick-flashes green	The Li-ion battery is completely discharged. Recharge the battery. If the LED again starts quick-flashing after the battery has been charged, consult Hilti Service.
One (1) LED quick-flashes yellow	The Li-ion battery or the product in which it is inserted is overloaded, too hot or too cold, or experiencing some other fault. Bring the product and the battery to the recommended working temperature and do not overload the product when it is in use. If the message persists, consult Hilti Service.
One (1) LED shows yellow	The Li-ion battery and the product in which it is inserted are not compatible. Consult Hilti Service.
One (1) LED quick-flashes red	The Li-ion battery is locked and cannot be used. Consult Hilti Service.

Indicators showing the battery's state of health

To check the battery's state of health, press the release button and hold it down for longer than three seconds. The system does not detect a potential malfunction of the battery due to misuse, for example battery dropped or pierced, external heat damage, etc.

Status	Meaning
All LEDs show in sequence, followed by one (1) LED showing constantly green.	The battery can remain in use.
All LEDs show in sequence, followed by one (1) LED quick-flashing yellow.	The check to ascertain the battery's state of health did not complete. Repeat the procedure, or consult Hilti Service.
All LEDs show in sequence, followed by one (1) LED showing constantly red.	If a connected product can still be used, the remaining battery capacity is below 50 %. If a connected product can no longer be used, the battery has reached the end of its useful life and has to be replaced. Consult Hilti Service.

Function selector switch

3 functions can be selected by means of the function selector switch:
Explanation of symbols, function selector switch

Function	Meaning
	Cutting In mode, when the control switch is pressed and held down the product cycles through one complete cycle. The cycle consists of 2 phases: Perform cutting operation Return to initial position After completing a cycle the product stops automatically and the control switch has to be pressed again to start a new cycle. You can pause a cycle at any time by releasing the control switch. Pressing the control switch again resumes the phase in which you released the control switch.
	Lock (middle position) The movable cutting arm is locked and cannot be moved. Select this function when you are not working with the product.
	Reverse When the control switch is pressed the movable cutting arm opens. Use this function only if you have to release a threaded rod while a cut is in progress, for example because the thread of the threaded rod is not correctly seated in the thread of the cutting edges or the product's overload protection coupling has tripped.

Product properties

	STR 4-22
Product generation	01
Weight	2.69 kg (in accordance with EPTA-Procedure 01 without battery)
Dimensions (L×W×H)	204 mm × 103 mm × 253 mm
Ambient temperature for operation	−17 ℃ … 60 ℃
Storage temperature	−20 ℃ … 70 ℃

Information about strength classes

Threaded rod	Cuttable strength class
W3/8" structural steel	4.8
M6/M8/M10 structural steel	4.8
W3/8" stainless steel	A2-50

Battery

Battery operating voltage	21.6 V
Weight, battery	See the section headed "Intended use"
Ambient temperature for operation	−17 ℃ … 60 ℃
Storage temperature	−20 ℃ … 40 ℃
Battery charging starting temperature	−10 ℃ … 45 ℃

Noise information and vibration values

The sound pressure and vibration values given in these instructions were measured in accordance with a standardized test and can be used to compare one power tool with another. They can also be used for a preliminary assessment of exposure.
The data given represent the main applications of the power tool. However, if the power tool is used for different applications, with different accessory tools, or is poorly maintained, the data can vary. This can significantly increase exposure over the total working period.
An accurate estimation of exposure should also take into account the times when the power tool is switched off, or when it is running but not actually being used for a job. This can significantly reduce exposure over the total working period.
Identify additional safety measures to protect the operator from the effects of noise and/or vibration, for example: maintaining the power tool and accessory tools, keeping the hands warm, organization of work patterns.
Noise information

Sound power level (LWA)	75 dB(A)
Sound pressure level (L pA)	67 dB(A)
Uncertainty (for LWA and L pA)	3 dB(A)

Total vibration

Total vibration	B 22‑55	0.2 m/s²
	B 22‑85	0.3 m/s²
Uncertainty (total vibration)		1.5 m/s²

Charging the battery

1. Before charging the battery, read the operating instructions for the charger.
   
2. Make sure that the contacts on the battery and the contacts on the charger are clean and dry.
   
3. Use an approved charger to charge the battery.
   

Inserting the battery

1. Charge the battery fully before using it for the first time.
   
2. Push the battery into the product until it engages with an audible click.
   
3. Check that the battery is seated securely.
   

Removing the battery

1. Press the battery release button.
   
2. Remove the battery from the product.
   

Fall arrest

As drop arrester for this product, use only a combination of the Hilti retaining strap #2293133 and the Hilti tool tether #2261970.

• Secure the retaining strap to the installation openings for accessories. Check that it holds securely.
  
• Secure one carabiner of the tool tether to the retaining strap and secure the second carabiner to a load-bearing structure. Check that both carabiners hold securely.
  
  Comply with the operating instructions of the Hilti retaining strap and those of the Hilti tool tether.
  

Using scaffold hook

The product has a scaffold hook that you can use to hook the product briefly to a railing, for example. In order to use the scaffold hook, flip the scaffold hook out.

Important instructions for handling the scaffold hook:
• Do not use the scaffold hook to lift the product or to attach a retaining strap.
  
• Make sure that the product is not unsteadied by strong wind and can be made to fall off the railing by vibration, for example.
  
• Hook the product with the scaffold hook only to railings or other firm structures. Do not hook the product on to a tool-belt or other items of clothing.
  
• Do not apply excessive force to the scaffold hook when hooking up. The scaffold hook could bend and the product could fall.
  
• Before every use, check the scaffold hook and the attachment points of the scaffold hook to the housing for visible damage, for example distortions and breakages. Use the scaffold hook only when it is in perfect working order.
  

Removing/installing accessories

You can install different accessories on the threaded-rod cutter, for example a parallel guide or a waste container for offcuts.

1. Press and hold down the release button (mounting adapter).
   
2. Pull the accessory to the side and out of the mounting adapter.
   
3. To install an accessory, push the accessory into the mounting adapter until it engages with an audible click.
   

Adapting parallel guide for M6 threaded rods

If you are cutting M6 threaded rods and using the parallel guide, you have to adapt the parallel guide accordingly with an adapter.

1. Press and hold down the release button (mounting adapter).
   
2. Pull the accessory to the side and out of the mounting adapter (1) .
   
3. Pull the M6 adapter out of the insert of the parallel guide (2) .
   
4. Mount the M6 adapter on the parallel guide (3) .
   
   • The M6 adapter engages.
     
5. Push the parallel guide into the mounting adapter until it engages with an audible click.
   

Changing the cutting blades

Removing cutting edges

1. Set the function selector switch to the function.
   
2. Move the cutting arm until the securing screw is readily accessible.
   
3. Set the function selector switch to the function and remove the battery.
   
4. Remove the depth gauge by pressing and holding down the release button and pulling out the depth gauge.
   
5. Use the hex key to slacken the securing screw in the movable cutting arm.
   
6. Remove the cutting edge from the movable cutting arm.
   
7. Use the hex key to slacken the securing screw in the stationary cutting arm.
   
8. Remove the cutting edge from the stationary cutting arm.
   

Installing cutting blades

9. Remove the cutting edges.
   
10. Check the set of cutting edges for burrs on the cutting sections and, if necessary, remove the burrs with a file.
    
11. Check the orientation of the arrow marks and insert the cutting blade into the stationary cutting arm.
    
    • The arrow mark faces toward the middle.
      
    • The securing screw can be screwed in easily.
      
12. Secure the cutting blade to the stationary cutting arm with the securing screw.
    
13. Check the orientation of the arrow marks and insert the cutting blade on the movable cutting arm.
    
    • The arrow mark faces toward the middle.
      
    • The securing screw can be screwed in easily.
      
14. Secure the cutting blade to the movable cutting arm with the securing screw.
    

Notes on formation of burrs at the cut

Burrs on the cut length of threaded rod rarely form on the side close to the movable cutting arm. On account of the design of the product, burrs on the cut length of threaded rod tend to form more frequently on the side close to the stationary cutting arm.

Burrs can also form if:
• The threaded rod is not seated correctly in the thread of the cutting blades.
  
• The cutting blades are in poor condition.
  
• The thread of the threaded rod is uneven.
  
• The securing screws of the cutting blades are not correctly tightened.
  

If a nut cannot be threaded on to the rod because of a burr remove the burr, for example with a pair of nippers, a file or an adjustable threading die.

Measuring threaded rod

Using depth gauge

1. Press and hold down the release button (depth gauge).
   
2. Slide the depth gauge to the length at which you want to cut off the rod.
   
3. When reading the setting, orient yourself by the indicator on the product.
   

Using the parallel guide

4. If necessary, adapt the parallel guide for M6 threaded rods.
   
5. Position the threaded rod at the length at which you want to cut off the rod.
   
6. When reading the length, orient yourself by the indicator on the product.
   

Operating threaded-rod cutter

In the cutting process, the thread in the cutting blade must be neatly engaged in the thread of the threaded rod. This prevents damage to the thread of the threaded rod and to the cutting blades. Make sure that the size of the threaded rod to be cut matches the size of the cutting blades.

1. Set the length of cut on the depth gauge.
   
2. Set the function selector switch to the function.
   
   Information on the functions is to be found in the section headed "Function selector switch".
   
3. Position the threaded-rod cutter on the threaded rod.
   
4. Press the control switch and hold it down until the cycle has completed.
   

Criteria for replacement of cutting blades

Chipping (1) or deformation (2) of the cutting blades indicates that the cutting blades need to be replaced. Always replace the movable cutting blade and the stationary cutting blade together as a set.
Also replace the cutting blades if slight burr formation on the side of threaded rod close to the movable cutting blade becomes more frequent.