AHKS18-57 AS - Saw Fein - Free user manual and instructions

USER MANUAL AHKS18-57 AS Fein

Exterior view of a silver and black power tool with visible circuit board (no text or symbols)

2025-07-14

	AHKS18-57 AS (**)
	7 136 04 ...
UV 18
P1	W 1800
P2	W 1000
I	~ (a.c.)
n0	/min, min-1, rpm, r/min 1300 - 2800
D	mm 150,0
d	mm 20,0
B	mm 2,0
T	mm 0 - 57
T B	mm 256 x 131
kg	3,05
LpA	dB(A)	99,2
KpA	dB	3
LwA	dB(A)	107,2
KwA	dB	3
LpCpeak	dB 122,7
KpCpeak	dB	3
am/s	2	1,1
Ka	m/s2	1,5

		GBA 18V2 Ah	GBA 18V4 Ah	GBA 18V5 Ah	ProCORE 18V4 Ah	ProCORE 18V8 Ah	ProCORE 18V12 Ah
AMP Share I
Promed by BOSCH
	kg	0,35	0,60	0,60	0,52	0,96	1,35
							Lithium Ion
U	V=						18
T_CHARGE	°C						0...+35
							GAL 1880 CV, GAL 18V-160

de 17 pt 65 hu 110 ro 156 et 205 th 247 en 26 el 73 cs 118 sr 164 lt 212 ja 256 fr 33 da 82 sk 125 hr 171 lv 219 hi 264 it 41 no 89 pl 133 ru 178 zh(CM) 227 ar 279 nl 49 sv 96 sl 141 uk 187 zh(CK) 234 es 57 fi 103 tr 149 bg 196 ko 240

6-7 13 14 5 15 9 13 11 15 16 8 10-11 12 i+

Technical diagram illustrating a mechanical assembly with labeled parts and a 5 mm dimension annotation.

max. 57 mm 1. 2. 3. 4. 5. 6. 7. 8. 9. 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

80-100%

□ □ □ 60-100 %

60-80%

□ □ □ 30-60 %

40-60%

□□□ 5-30%

20-40%

5-20%

0-5%

0-5%

Translation of the Original Instructions.

Symbols, abbreviations and terms used.

Symbol, character Explanation
	Make sure to read the enclosed documents such as the Instruction Manual and the General Safety Instructions.
	Do not touch the rotating parts of the power tool.
	Observe the instructions in the text or graphic opposite!
	Observe the information in the adjacent text!
	General prohibition sign. This action is prohibited.
BOSCH	AMPShare is the shared battery system that lets you run many tools from many pro brands on just one battery.
	Before commencing this working step, remove the battery from the power tool. Otherwise there may be danger of injury caused by unintentional starting of the power tool.
	Use eye protection during operation.
	Use ear protection during operation.
	Use protective gloves during operation.
	Do not charge damaged batteries.
	Protect the battery against heat, e.g., against continuous intense sunlight, fire, debris, water, and moisture.
	Additional information.
	Gripping surface
[WBAX]	Switching on
	Switching off
	See section “Operating Instructions”
	Keep your hands out of the sawing area while the machine is running. Danger of injury in case of contact with the saw blade.
	Keep your hands out of the sawing area while the machine is running. Danger of injury in case of contact with the saw blade.
	Caution: Do not view into the switched-on lamp!
	Confirms the conformity of the power tool with the directives of the European Community.
	Confirms the conformity of the power tool with the directives of Great Britain (England, Wales, Scotland).
EAC	Confirms the conformity of the power tool with the national technical regulations of the Customs Union (Belarus, Russia, Kyrgyzstan, Kazakhstan and Armenia).
DEKRA US	This symbol confirms the certification of this product for the USA and Canada.
10	Applies only for China:The duration of environmental protection under normal use of the product is 10 years.
WARNING	This sign indicates a possible dangerous situation that could cause severe or fatal injury.
DANGER	This sign warns of a directly imminent, dangerous situation. A false reaction can cause a severe or fatal injury.
Li-Ion	Recycling symbol: designates recyclable materials
	Worn out power tools and other electrotechnical and electrical products should be sorted separately for environmental-friendly recycling.
	Identifies recyclable packaging and products that must be collected and disposed of separately.
	Battery type
	Charger type
	Low speed
	High speed
(**) May contain numbers and letters
(Ax - Zx) Marking for internal purposes

Character Unit of measurement, international		Explanation
UV	≡D	C v o
fHz Frequency
n0	/min, min-1, rpm, r/min No-load speed (with fully charged battery)
P1	W Power input
P2	W	O u t
TCHARGE	°C Allowable ambient temperature when charging
∅ mm Diameter of a round part
	mm Saw blade diameter
	mm Diameter of saw blade mounting hole
→	mm Maximum kerf widthmm Maximal cutting depth T	B: Distance between two parallel planes touching the opposite sides of at least three saw tooth tips.
	mm Dimensions of base plate (width x depth)
[D6KK]	kg Weight according to EPTA-Procedure 01
	dB Sound pressure level
	dB Sound power level
	dB Peak sound pressure level
		Uncertainty
a	m/s ^2	Vibrational emission value according to EN 62841 (vector sum of three directions)
	m, s, kg, A, mm, V, W, Hz, N, °C, dB, min, m/s ^2	Basic and derived units of measurement from the international system of units SI.

For your safety.

WARNING

Read all safety warnings and all instructions. Failure to follow the

warnings and instructions may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

Do not use this power tool before you have thoroughly read and completely understood this Instruction Manual and the enclosed "General

Safety Instructions" (document number

3 41 30 465 06 0). The documents mentioned should be kept for later use and enclosed with the power tool, should it be passed on or sold.

Please also observe the relevant national industrial safety regulations.

Intended use of the power tool.

The hand-held, cordless circular saw is intended for making straight saw cuts in metal materials and plastics in weather-protected environments without water supply using the application tools and accessories recommended by FEIN.

The circular saw is not intended for plunge cuts.

All other types of use are considered as not intended for.

Foreseeable improper use.

The circular saw must not be used for sawing wooden materials.

When switching on, during operation and when switching off, avoid direct contact with metal chips in the side area of the ventilation openings. Also pay attention to flying sparks and chips when other power tools are used in the adjacent area. Failure to observe these instructions may result in blocking of the motor.

Safety instructions.

Cutting procedures

DANGER

Keep hands away from cutting area and the blade. Keep your second

hand on auxiliary handle, or motor housing. If both

hands are holding the saw, they cannot be cut by the blade.

Do not reach underneath the workpiece. The guard cannot protect you from the blade below the workpiece.

Adjust the cutting depth to the thickness of the workpiece. Less than a full tooth of the blade teeth should be visible below the workpiece.

Never hold the workpiece in your hands or across your leg while cutting. Secure the workpiece to a stable platform. It is important to support the work properly to minimise body exposure, blade binding, or loss of control.

Hold the power tool by insulated gripping surfaces, when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a "live" wire will also make exposed metal parts of the power tool "live" and could give the operator an electric shock.

When ripping, always use a rip fence or straight edge guide. This improves the accuracy of cut and reduces the chance of blade binding.

Always use blades with correct size and shape (diamond versus round) of arbour holes. Blades that do not match the mounting hardware of the saw will run off-centre, causing loss of control.

Never use damaged or incorrect blade washers or bolt.

The blade washers and bolt were specially designed for your saw, for optimum performance and safety of operation.

Kickback causes and related warnings

- Kickback is a sudden reaction to a pinched, jammed or misaligned saw blade, causing an uncontrolled saw to lift up and out of the workpiece toward the operator.

- When the blade is pinched or jammed tightly by the kerf closing down, the blade stalls and the motor reaction drives the unit rapidly back toward the operator.

- If the blade becomes twisted or misaligned in the cut, the teeth at the back edge of the blade can dig into the top surface causing the blade to climb out of the kerf and jump back toward the operator.

Kickback is the result of saw misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below.

Maintain a firm grip with both hands on the saw and position your arms to resist kickback forces. Position your body to either side of the blade, but not in line with the blade. Kickback could cause the saw to jump backwards, but kickback forces can be controlled by the operator, if proper precautions are taken.

When blade is binding, or when interrupting a cut for any reason, release the trigger and hold the saw motionless in the material until the blade comes to a complete stop. Never attempt to remove the saw from the work or pull the saw backward while the blade is in motion or kickback may occur. Investigate and take corrective actions to eliminate the cause of blade binding.

When restarting a saw in the workpiece, centre the saw blade in the kerf so that the saw teeth are not engaged into the material. If a saw blade binds, it may walk up or kickback from the workpiece as the saw is restarted.

Support large panels to minimise the risk of blade pinching and kickback. Large panels tend to sag under their own weight. Supports must be placed under the panel on both sides, near the line of cut and near the edge of the panel.

Do not use dull or damaged saw blades. Unsharpened or improperly set blades produce narrow kerf causing excessive friction, blade binding and kickback.

Blade depth and bevel adjusting locking levers must be tight and secure before making the cut. If blade adjustment shifts while cutting, it may cause binding and kick-back.

Use extra caution when sawing into existing walls or other blind areas. The protruding blade may cut objects that can cause kickback.

Lower guard function

Check the lower guard for proper closing before each use. Do not operate the saw if the lower guard does not move freely and close instantly. Never clamp or tie the lower guard into the open position. If the saw is accidentally dropped, the lower guard may be bent. Raise the lower guard with the retracting handle and make sure it moves freely and does not touch the blade or any other part, in all angles and depths of cut.

Check the operation of the lower guard spring. If the guard and the spring are not operating properly, they must be serviced before use. Lower guard may operate sluggishly due to damaged parts, gummy deposits, or a build-up of debris.

The lower guard may be retracted manually only for special cuts such as "Tauch- und Winkelschnitten". "plunge cuts" and "compound cuts". Raise the lower guard by the retracting handle and as soon as the blade enters the material, the lower guard must be released. For all other sawing, the lower guard should operate automatically.

Always observe that the lower guard is covering the blade before placing the saw down on bench or floor. An unprotected, coasting blade will cause the saw to walk backwards, cutting whatever is in its path. Be aware of the time it takes for the blade to stop after switch is released.

Special safety instructions.

Do not use a damaged power tool. Before each use of the power tool, check the housing and other components for damage such as cracks or breakage.

Only use approved batteries. When using non-compatible batteries, the power tool will not start.

Wear personal protective equipment. Depending on application, use face shield, safety goggles or safety glasses. As appropriate, wear dust mask, hearing protectors, gloves and workshop apron capable of stopping small abrasive or workpiece fragments. The eye protection must be capable of stopping flying debris generated by various operations. The dust mask or respirator must be capable of filtrating particles generated by your operation. Prolonged exposure to high intensity noise may cause hearing loss.

When working at height, block off the area below the work area and always secure the power tool and the workpiece against falling.

Only use the power tool on a stable work surface and ensure a secure footing.

Secure the work piece firmly. A work piece that is gripped tightly in a clamping device or vice, is more secure than if held by hand.

While working, the workpiece must be firmly supported and secured against moving.

Do not attempt to cut extremely small workpieces.

Hold the power tool firmly. High reaction torque can briefly occur.

Do not work with materials containing magnesium. Danger of fire.

Do not work with CFRP (carbon-fiber-reinforced polymer) and materials containing asbestos. These materials are considered carcinogenic.

Do not rivet or screw any name-plates or signs onto the power tool. If the insulation is damaged, protection against an electric shock will be ineffective.

Do not use accessories which are not specifically designed and recommended by the power tool manufacturer. Safe operation is not ensured merely because an accessory fits your power tool.

Clean the ventilation openings on the power tool at regular intervals using non-metal tools. The blower of the motor draws dust into the housing. An excessive accumulation of metallic dust can cause an electrical hazard.

Never look or stare into the light of the power tool's lamp from a short distance. Never point the light of the lamp into the eyes of other persons in close vicinity.

The radiation produced by the lamp can be harmful for the eye.

Do not direct the power tool against yourself, other persons or animals. Danger of injury from sharp or hot application tools.

Remove the battery before carrying out any adjustments or maintenance on the power tool.

Do not use grinding discs.

Only use saw blades with a diameter corresponding to the label on the power tool.

Only use saw blades with a speed marking that corresponds to or exceeds the specification on the power tool.

Use only saw blades that are suitable for the material to be sawn.

Avoid overheating the saw tooth tips.

When sawing plastic, avoid melting the material.

Do not touch rotating application tools. Only remove chips when the application tool is at a complete stop.

Only actuate the spindle locking button when the insert tool is stopped.

Do not stop the saw blade by applying lateral pressure to it.

Check that the retracting guard is working properly each time before using. The retracting guard must move freely and return easily, precisely, and automatically into its starting position.

Do not clamp the retracting guard in the retracted position for sawing.

Check the workpiece for foreign objects. When working, always pay attention not to saw into nails etc.

If the saw blade jams, switch off the motor immediately.

Use and handling of the battery (battery pack).

These safety warnings apply only for 18V FEIN AMP-Share Li-ion batteries.

Use the battery only in AMPShare partner products. 18V batteries marked with AMPShare are fully compatible with the following products:

- All products of the FEIN-18V-AMPShare system

- All 18V products from AMPShare partners.

When working with and charging incorrect, damaged, repaired or reconditioned batteries, imitations or other brands, there is danger of fire and/or explosion.

Observe the battery recommendations in the operating instructions for your product. Only in this way can the battery and the product be operated safely, and the batteries are protected from dangerous overload.

Only charge the batteries with chargers recommended by FEIN or one of the AMPShare partners. A charger that is suitable one type of battery pack may create a risk of fire when used with another battery pack.

The battery is supplied partially charged. To ensure full battery capacity, completely charge the battery in the battery charger before using for the first time.

Store batteries out of the reach of children.

Batteries must not be disassembled, opened or reduced in size. Do not subject batteries to mechanical impact or shock. Hazardous vapours and fluid can escape in case of damage and improper use of the battery. The vapours can irritate the respiratory system. Liquid ejected from the battery may cause skin irritations or burns.

In case of skin contact with battery fluid, rinse immediately with plenty of water. In case of eye contact with battery fluid, wash out the eye with clean water and immediately seek a doctor for treatment!

When the battery fluid has come into contact with objects close by, check the respective components.

Avoid skin contact by wearing protective gloves. Clean the parts with dry household paper or replace the parts if necessary. Escaping vapours can irritate the respiratory system. Liquid ejected from the battery may cause skin irritations or burns.

Do not short-circuit the battery. Keep the battery not being used away from 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.

The battery can be damaged by sharp objects such as nails or screwdrivers or by external force. An internal short-circuit may occur and the battery can burn, smoke, explode or overheat.

Never maintain damaged batteries. Any maintenance of batteries should be performed only by the manufacturer or by authorised after-sales service centers.

Protect the battery against heat, e.g., against continuous intense sunlight, fire, debris, water, and moisture. Danger of explosion and short-circuiting.

Operate and store the battery only at ambient temperatures between -20 °C and +50 °C. As an example, do not leave the battery in a vehicle in summer. At temperatures < 0 °C, machine-specific performance restrictions are possible.

Charge the battery only at ambient temperatures between 0 °C and +35 °C. Charge the battery via USB connection only at ambient temperatures between

+10 °C and +35 °C. Charging the battery outside the temperature range may damage the battery or increase the risk of fire.

Handle discharged batteries with care. Batteries are a source of danger, as they can cause a very high short-circuit current. Even when Li-ion batteries appear to be in a discharged state, they never fully discharge.

Do not immerse the battery in liquids, such as (salt) water or beverages. Contact with liquids can damage the battery. This may result in heat build-up, smoke generation, ignition or explosion of the battery. Do not continue to use the battery and contact an after-sales service authorized by FEIN.

Do not use a damaged battery. The use of a battery must be stopped immediately as soon as abnormal properties, such as odour development, heat, discolouration or deformation occur. Continued operation can cause the battery to generate heat and smoke, ignite or explode.

Do not open, crush, overheat or set fire to the battery.

Non-observance of this warning may result in burns and fire. Follow the manufacturer's instructions.

Extinguish burning Li-ion batteries with water, sand or a fire blanket.

Avoid physical blows/impact. Impact and penetration of objects can damage batteries. This may result in leakage, heat build-up, smoke generation, ignition or explosion of the battery.

Never charge the battery unattended overnight. Fire and explosion hazards can result in case of non-observance.

Do not remove the battery from its original packaging until it is going to be used.

Remove the battery only when the power tool is switched off.

Before any work on the machine itself, remove the battery from the power tool. If the power tool accidentally starts, there is danger of injury.

Protect the battery against moisture and water. Clean contaminated battery terminals and power tool connections with a dry, clean cloth.

Remove the battery when transporting and storing the power tool.

Observe the safety instructions in the manuals of the chargers from FEIN or the AMPShare partners.

Vibration and noise emission values

The vibration and noise emission values given in these instructions have been measured according to a measurement method standardised in EN 62841 and can be used to compare power tools with each other. They are also suitable for a preliminary assessment of vibration and noise exposure.

The given vibration and noise emission values represent the main applications of the power tool.

However, if the power tool is used for other applications, with deviating application tools or insufficient maintenance, the overall vibration values and the noise emission values may differ. This can significantly increase the vibration and noise exposure over the total working period.

For an accurate estimation of vibration and noise exposure, the durations when the equipment is switched off or running but not actually in use should also be taken into account. This may significantly reduce the vibration and noise exposure over the total working period.

Identify additional safety measures to protect the operator from the effects of vibration and noise such as: Maintain the power tool and the accessories, keep the hands warm, organization of work patterns.

Handling hazardous dusts

For work procedures with this product where material is removed, dusts develop that can be hazardous to one's health.

Contact with or inhaling some dust types, e.g. asbestos and asbestos-containing materials, lead-containing coatings, metal, some wood types, minerals, silicate particles from materials containing stone, paint solvents, wood preservatives, anti-fouling paints for vessels, can trigger allergic reactions to the operator or bystanders or lead to respiratory infections, cancer, birth defects or other reproductive harm. The risk from inhaling dusts depends on the exposition. Use dust extraction matched appropriately for the developing dust, as well as personal protective equipment. Provide for good ventilation of the workplace. Leave the processing of asbestos-containing materials to specialists.

Wood and light-metal dust, hot mixtures of sanding dust and chemical materials can self-ignite under unfavourable conditions or cause an explosion. Avoid sparking in the direction of the dust collector as well as overheating of the product and the materials being sanded. Empty the dust collector in good time. Observe the material manufacturer's working instructions, as well as the relevant regulations in your country for the materials being worked.

Starting Operation.

Carry out the following steps each time before using the product.

• Check the proper condition and operation of the product.
• Check the tight seating of the application tool.
• Check the function of the retracting guard. It must move freely and return easily, precisely, and automatically into its starting position.

Operation.

Overloading of the power tool is indicated by continuous lighting of the work area lamp. In case of overload, the power tool switches off and cannot be switched on again until after cooling down.

In some cases, restarting is not possible, which is indicated by the work area lamp flashing. Remove the battery and try restarting after a few minutes. If the work area lamp flashes again, contact the FEIN Service.

Adjusting the cutting depth (see page 12).

Adjust the cutting depth to the thickness of the workpiece. Less than a full tooth of the blade teeth should be visible below the workpiece.

Changing the saw blade (see page 6/7).

Recommendation: Change the saw blade using the fixture integrated in the case (see page 8).

1. Press and hold the locking button.
2. Apply an Allen key to the fastening screw and turn the saw shaft slowly until the lock engages.

3. Unscrew the fastening screw in anticlockwise direction and remove the outer saw blade flange.

4. Pull back the retracting guard and remove the saw blade.

5. Clean the contact surfaces between the inner and outer saw blade flange.
6. Insert a new saw blade, observing the correct rotation direction and saw tooth alignment. The rotation direction is indicated by arrows on the saw blade and on the retracting guard. In the visible area of the saw blade, the saw teeth must be aligned in the sawing direction.
7. Mount the outer saw blade flange and tighten the fastening screw (8 Nm).

Handling the battery.

Charge the battery only at a temperature range from 0 °C ... 35 °C ( 32 °F ... 95 °F ). At the beginning of the charging procedure, the battery temperature must be within the battery operating-temperature range.

Charge-control Indicator on the Battery (see page 15).

The charge condition can be indicated by the green LEDs of the charge-control indicator on the battery.

Press the charge-control indicator button ⓒ or to indicate the charge condition.

When no LED lights up after pressing the charge-control indicator button, the battery is defective and must be replaced.

Transport.

The Li-ion batteries are subject to the Dangerous Goods Legislation requirements. The user can transport the batteries by road without further requirements.

When being transported by third parties (e.g.: air transport or forwarding agency), special requirements on packaging and labelling must be observed. For preparation of the item being shipped, consulting an expert for hazardous material is required.

Dispatch batteries only when the housing is undamaged. Tape or mask off open contacts and pack up the battery in such a manner that it cannot move around in the packaging. Please also observe possibly more detailed national regulations.

Maintenance and Service.

When working metal under extreme operating conditions, it is possible for conductive dust to settle in the interior of the product.

Blow out the interior of the product via the ventilation openings frequently with dry and oil-free compressed air.

If the power tool becomes permanently blocked due to misuse, professional maintenance will be required.

Products that have come into contact with asbestos may not be sent in for repair. Dispose of products contaminated with asbestos according to the applicable country-specific regulations for such disposal.

For products and accessories from FEIN that require repair, contact the FEIN Service at www.fein.com.

Renew stickers and warning indications on the product when aged and worn.

Use only original spare parts from FEIN. The current spare parts list for the product can be found at www.fein.com.

If required, you can change the following parts yourself:

application tools, battery

Warranty and liability.

The warranty for the product is valid in accordance with the legal regulations in the country where it is marketed. In addition, FEIN also provides a guarantee in accordance with the FEIN manufacturer's warranty declaration.

The delivery scope of the product may include only a part of the accessories described or shown in this Instruction Manual.

Declaration of conformity.

This CE declaration is only valid for European Union and EFTA (European Free Trade Association) countries and only for products intended for the EU or EFTA market. After placing the product on the EU market the UKCA mark loses its mark validity.

The UKCA declaration is only valid for the Great Britain market (England, Wales and Scotland) and only for products intended for the Great Britain market. After placing the product on the Great Britain market the CE mark loses its mark validity.

Putting out of operation.

1. Disconnect the product from the power supply or remove the battery.
2. Remove any application tools and accessories mounted on the product.

Environmental protection, disposal.

Do not dispose of the batteries into household-waste!

Packaging, worn out power tools and accessories should be sorted for environmental-friendly recycling. Dispose of batteries only when discharged.

For batteries that are not completely discharged, insulate the terminals with tape as a protective measure against short-circuiting.

Only for EC countries:

According to the European Guideline 2002/66/EC, defective or used battery packs/batteries, must be collected separately and disposed of in an environmentally-correct manner.

Accessories.

Only use original accessories from FEIN intended for the product. Approved accessories for the product can be found at www.fein.com.

China RoHS Status Certificate

中国 RoHS 认证概况

Table of Toxic and Hazardous Substances/Elements and their Content

as required by China's Management Methods for Controlling Pollution by Electronic Information Products

有毒有害物质 / 成分及其含量表