Description
Yato cordless impact wrench 350 Nm 4 Ah set includes a brushless 18-volt impact wrench with a 1/2″ (12.7 mm) square drive, two 4.0 Ah Li-Ion batteries, a charger and a 1/2″–1/4″ bit adapter. The maximum torque of the wrench is 350 Nm, a speed of 0–2500 min⁻¹ and the impact rate 0–3170 min⁻¹.
The impact mechanism converts the rotation of the brushless motor into short tangential impacts, so torque is produced without a corresponding reaction torque being transmitted to the user’s hand. The 350 Nm wrench suits medium-heavy bolted and nut joints, for example in vehicle, machine and steel structure maintenance, and with the bit adapter it can drive screws with impact bits.
The control panel selects two speed and torque levels (low and high) for clockwise rotation, and for anticlockwise rotation either continuous mode or the intermittent Reverse self stop release mode, in which the drive rotates only briefly with each press of the trigger. How far the trigger is pressed adjusts the speed and torque steplessly, and the overload clutch disengages the drive at maximum torque. The wrench also has an LED work light, a spindle brake and a direction switch.
The tool weighs 1.1 kg. The sound pressure level is 95 dB(A), the sound power level 103 dB(A) and vibration 16.1 m/s²; the insulation class is III and the IP rating IPX0. The batteries in the set have a charge level indicator, and the charger charges a 4 Ah battery in about 2 hours. The batteries are Yato 18V system slide-on batteries that fit the other tools in the range.
Uses and suitability:
The Yato cordless impact wrench 350 Nm 4 Ah is designed for medium-heavy bolted and nut joints and for impact screwing via the bit adapter. The body-only model of the same wrench without batteries is the Yato cordless impact wrench 18V 1/2″ 350Nm, body only; for higher torque, choose the Yato cordless impact wrench 18V 850Nm, body only. For charging extra batteries, you can also use the Yato battery charger 18V 2.2A.
- Vehicle maintenance: Loosening and pre-tightening wheel nuts, chassis fixings and body bolts; final tightening is done with a torque wrench.
- Machine and equipment maintenance: Bolted joints in frames, guards and mounting lugs.
- Installation and construction work: Bolts and nuts in brackets, mounting plates and steel structures with 1/2″ impact sockets.
- Screwing with the bit adapter: With the 1/2″–1/4″ adapter, the wrench can be used with impact bits at the lowest level, for example to drive construction screws and fixing screws.
Package contents:
- Impact wrench 18 V, 1/2″ square drive
- Bit adapter 1/2″ (12.7 mm) to 1/4″ (6.3 mm)
- Li-Ion battery 18 V 4.0 Ah, 2 pcs
- Charger 18 V
Features:
- Brushless motor: Efficient torque transfer and low mechanical wear.
- Two speed and torque levels: Selectable on the control panel for clockwise rotation.
- Reverse self stop: Intermittent release mode in which the drive rotates only briefly with each press of the trigger.
- Adjustable torque: How far the trigger is pressed adjusts the speed and torque steplessly.
- Overload clutch: Disengages the drive at maximum torque.
- Spindle brake: The drive stops quickly when the trigger is released.
- LED work light: Illuminates the work area.
- Reversing switch: Tightening and loosening with the same tool.
- Bit adapter included: 1/4″ hex bit holder that fits the 1/2″ drive.
- Two batteries and fast charging: One battery charges while the other is in use; charging time about 2 h.
- Charge level indicator: Indicator operated by the button on the battery.
Technical specifications:
- Voltage: 18 V DC
- Drive: 1/2″ (12.7 mm) square
- Maximum torque: 350 Nm
- No-load speed: 0–2500 min⁻¹
- Stroke rate: 0–3170 min⁻¹
- Motor: brushless
- Hammer function: yes
- Adjustable torque: yes (2 levels on the control panel)
- Release modes: continuous / intermittent (Reverse self stop)
- Electronic speed control: yes
- Reversing switch: yes
- Spindle brake: yes
- Work light: LED
- Battery type: Li-Ion 18 V (Yato 18V system)
- Battery capacity: 4000 mAh
- Batteries included: 2
- Charger included: yes
- Charging time: 2 h
- Fast charging: yes
- Charge level indicator: yes
- Charger input: 200–240 V~, 50/60 Hz, 1.5 A
- Charger output: 21.5 V DC, 2.2 A
- Protection class: III
- IP rating: IPX0
- Sound pressure level LpA: 95.0 ± 3.0 dB(A)
- Sound power level LwA: 103.0 ± 3.0 dB(A)
- Vibration ah: 16.1 ± 1.5 m/s²
- Unit weight: 1.1 kg
- Maximum temperature of outer surfaces in use: 60 °C
- Conformity: EN 62841-1, EN 62841-2-2, EN IEC 55014-1, EN IEC 55014-2
Yato cordless impact wrench 350 Nm 4 Ah user instructions:
1. Charging the battery: The batteries are supplied uncharged. Slide the battery into the charger slot and plug the charger into a socket; the charger indicator light shows charging and a full battery. Charge indoors in a dry place under supervision.
2. Fitting the socket: Remove the battery. Choose a 1/2″ impact socket of the correct size for the fastener and push it onto the drive, or fit the 1/4″ bit adapter and an impact bit.
3. Fitting the battery and selecting the direction: Select the direction of rotation with the switch and slide the battery into the battery slot until the latch locks.
4. Selecting the mode: Use the control panel button to select a suitable clockwise level (small or large hammer symbol). For anticlockwise rotation, you can select the intermittent Reverse self stop mode, in which the drive rotates only briefly with each press.
5. Tightening: Turn the bolt or nut by hand at least two turns. Hold the wrench with both hands, place the socket on the nut and press the trigger. When the impact mechanism starts hammering, release the trigger. Check the final torque with a torque wrench.
6. Loosening: Select anticlockwise rotation. If the breakaway torque of the fastener exceeds the maximum torque of the wrench, the overload clutch operates and the fastener does not loosen. Release the trigger and wait until the motor stops.
7. Maintenance: Remove the battery before maintenance. Clean the body and ventilation openings with compressed air (max. 0.3 MPa), a brush or a dry cloth without chemicals. Store the batteries at 0–30 °C at about 70% charge.
Warnings:
- Noise: Sound pressure level 95 dB(A), so wear hearing protection.
- Personal protective equipment: Wear safety glasses and protective gloves.
- Vibration: 16.1 m/s², so limit continuous use and take breaks.
- Battery out before changing the socket: Change the socket or adapter and carry out maintenance only with the battery removed.
- Impact sockets and bits only: Ordinary sockets and bits can crack in impact use.
- Overtightening: Continuous impacting tightens the joint further and can break the fastener; check the torque with a torque wrench.
- Hidden wiring: Hold the wrench by the insulated handles if the fastener may hit a live cable.
- Charger and batteries: Use only the supplied charger and Yato 18V batteries, charge in a dry place under adult supervision and do not short-circuit the battery terminals.
- Children: Keep the wrench, batteries and charger out of the reach of children.
Frequently asked questions (FAQ):
What is included in the Yato cordless impact wrench 350 Nm 4 Ah set?
A brushless impact wrench with a 1/2″ drive, a 1/2″–1/4″ bit adapter, two 18 V 4.0 Ah Li-Ion batteries and a charger.
What is the Reverse self stop function?
An intermittent release mode selected for anticlockwise rotation, in which the drive rotates only briefly with each press of the trigger. It makes controlled loosening of the fastener easier, so a loosened nut does not spin off the thread.
Can the wrench be used for screwing?
Yes. A 1/4″ bit intended for impact use is fitted to the supplied 1/2″–1/4″ bit adapter. Place the bit in the screw before starting and use the lowest level.
Can the wrench be used to tighten wheel nuts?
The wrench can be used to loosen and pre-tighten wheel nuts, but final tightening is always done with a torque wrench to the value specified by the vehicle manufacturer.
How long does it take to charge the battery?
The supplied charger charges a 4 Ah battery in about two hours. With two batteries, one can charge while the other is in use.
Recycling instructions:
The wrench and charger in the Yato cordless impact wrench 350 Nm 4 Ah set are electrical and electronic equipment that must not be disposed of with mixed waste; take them to a WEEE collection point. Take Li-Ion batteries separately to battery collection; tape the battery terminals before returning them to prevent short circuits. Sort the cardboard packaging into cardboard collection and the plastic parts into plastic collection.
