1,627
NM
max torque
8,500
RPM
no load speed
1.70
KG
net weight
85.0
DBA
sound pressure
Everyday Maintenance
Still taking the tool apart
just to grease it?
For workshops using pneumatic impact wrenches every day, maintenance can easily become a problem. If the hammer mechanism is not greased regularly, internal wear can increase and torque performance may drop. But when greasing requires taking the tool apart, maintenance is often delayed until something goes wrong.
Maintenance Delay
Greasing Gets Put Off
When lubrication requires opening the tool, routine maintenance is easier to postpone.
Downtime
A Tool on the Bench Isn’t Working
Disassembly, lubrication and reassembly take the wrench—and the technician—away from productive work.
Daily Fatigue
Every Extra Gram Adds Up
When a wrench is picked up repeatedly throughout the shift, tool weight becomes part of the operator’s daily workload.
See It Working
Grease It.
Run It.
Keep Going.
Grease goes straight into the impact mechanism through the patented hole, and the tool goes back to work — 1,627 Nm of maximum torque at 1.70 kg in the hand.
Less maintenance time, less weight in the hand, and strong power for daily professional work.
Grease
Injected without disassembling the tool
Power
1,627 Nm maximum torque on stubborn fasteners
Weight
1.70 kg magnesium-alloy body in the hand
Key Features
Built To Stay
In Service.
Magnesium Alloy
Strong Without the Extra Weight
Magnesium-alloy front and rear housings combine structural strength with low weight, helping keep the tool at only 1.70 kg for repeated professional use.
Composite Body
Comfortable in Changing Temperature
The composite housing reduces direct heat and cold transfer compared with exposed metal surfaces, helping the grip feel more comfortable in hot or cold working environments.
Air Efficiency
Less Demand on the Air System
136 L/min average air consumption helps control air demand in workshops running multiple pneumatic tools.
Low Vibration
Less Vibration Through the Shift
A vibration level of only 4.7 m/s² helps reduce the vibration transferred to the operator’s hands, making repeated fastening and removal work more comfortable over longer working periods.
Specifications
The Numbers.
Figures from the official M7 NC-4255QH product listing.
Get In Touch
Request
a quote.
Tell us your market and volume. Our export team replies within two business days.
Patented grease hole
1,627 Nm at 1.70 kg
Born in Taiwan quality
FAQ
Common Questions.
What does the patented grease hole do?
It allows grease to be injected directly into the impact mechanism without disassembling the tool, so routine lubrication no longer requires taking the wrench apart.
Why does greasing the hammer mechanism matter?
If the hammer mechanism is not greased regularly, internal wear can increase and torque performance may drop. Easier greasing supports longer tool life and consistent torque output.
How much torque does the NC-4255QH deliver?
Maximum torque is 1,627 Nm (1200 ft-lb / 165.9 kgf-m), with a working torque range of 271–1085 Nm (200–800 ft-lb).
How heavy is the tool?
Net weight is 1.70 kg (3.7 lb). The front housing and back head cover are made of magnesium alloy, which helps keep weight down without giving up power.
What air supply does it need?
90 PSI (6.3 bar) with average air consumption of 4.8 CFM (136 L/min), through a 3/8″ air hose and a 1/4″ air inlet.
What bolt sizes does it cover?
Bolt capacity is 1″ (25 mm) for screws and 36 mm for nuts.
What are the noise and vibration figures?
Sound pressure is 85.0 dBA and the declared vibration level is 4.7 m/s². Employers remain responsible for their own exposure risk assessment.
Who is this tool for?
Tire shops, automotive repair, fleet maintenance and busy workshops where impact wrenches are used many times throughout the day.
How do I request pricing or become a distributor?
Use the Request a Quote form on this page with your market and volume — our export team replies within two business days.
Product Facts
Product Name
NC-4255QH 1/2″ Drive Air Impact Wrench with Patent Grease Hole
Brand
M7 Mighty-Seven — Born in Taiwan
Product Type
Pneumatic 1/2″ square drive impact wrench
Best Use
High-torque fastener work in shops that need simple, regular lubrication
Key Features
Patented grease injection hole with go sign, magnesium-alloy front housing and back head cover, 1,627 Nm max torque, 1200 ft-lb in 5 seconds reverse direction, 1.70 kg net weight, durable composite material
Main Users
Tire shop and automotive repair technicians, fleet maintenance teams, busy general workshops
Main Applications
Wheel nuts, suspension and brake fasteners, chassis and underbody work, fleet servicing, repeated high-torque removal and fastening
NC-4255QH · 1/2" Air Impact Wrench with Patent Grease Hole | Born in Taiwan