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How to Choosing the Right Air Impact Wrench?


While the basic specs like size and power output are certainly important, they're just the start. There are many engineering nuance lying under the hood of a high-quality air impact wrench. Many of the most crucial factors are completely invisible upon first glance.


The Handle Insulation


Most buyers don't think about hand insulation, but it's truly a make-or-break feature, especially for professional use. Insufficient insulation leads to that all-too-familiar numb-hands sensation from vibrations after just a few minutes of trigger time.


The best air impact wrenches use cutting-edge polymer compounds strategically wrapped around the entire handle area, including the rare full-coverage insulation under the grip areas. This superior insulation blocks vibrational energy transfer, preventing that fatiguing numbing effect.


It's easy to spot the difference – take the wrench in your hands and give it a rev or two. Well-insulated models will exhibit a slight mechanical vibration but almost no detectable buzz in the handle itself, even under full power. With a poorly insulated model, you'll instantly feel the handle dancing around in your grip.


The Sound It Makes


Most people focus solely on the power output and torque specs, but the noise level is an often overlooked yet vital consideration. Air impact wrenches are inherently noisy tools due to their percussive action, but not all models are created equal in this regard.


The sound characteristics come down to the engineering of the hammer mechanism and overall build quality. Well-designed wrenches utilize precisely machined components and tungsten hammer pins to minimize metal-on-metal striking noise. Cheaper units tend to be louder, with a higher-pitched and harsher striking sound.


Why does this matter? Prolonged exposure to excessive noise levels can lead to permanent hearing damage over time. A quieter operating wrench allows you to work longer without fatiguing your ears as quickly. It's also more pleasant to use in enclosed areas without that teeth-grinding shriek.


The Exhaust Direction


Standard air impact wrench design directs the exhaust flow directly backwards, blasting it behind the tool. While this seems innocuous, it can actually create issues in certain situations.


First, the exhaust expels a mixture of vaporized lubricant and moisture from the compressed air. Over time, this contaminated airflow can soil anything behind the wrench's work area like walls, equipment, or vehicles. It's a nuisance to constantly have to wipe down surfaces afterwards.


The backward exhaust can also become a problem when working in tight areas or against vertical surfaces. The focussed airstream reflects off the nearby obstruction, blowing back towards your face and eyes. This is both uncomfortable and a potential safety hazard.


A superior design utilizes a rear exhaust diverter that redirects the airflow at a 45-60 degree angle, preventing blowback while dispersing contaminants over a wider area.


The Trigger Design


We'll round out this by circling back to ergonomics with the often-overlooked trigger design. This seemingly small detail can make a much bigger difference than you might expect in overall operating comfort and control.


Bargain wrenches typically use simple curved trigger levers with no other ergonomic shaping. By contrast, premium models utilize sophisticated ergonomic triggers meticulously profiled to distribute the operating force evenly across multiple fingers. The trigger shape prevents excessive pressure points while allowing your whole hand to comfortably pull the trigger straight back in a neutral position.



Selecting the AEROPRO A315 air impact wrench can make a world of difference in your air tool investment.


Twin hammer impact mechanism. Delivers maximum power and minimal vibration. Soft rubber handle, contraption design and comfortable use. Composite hosing, Less fatigue and comfortable use. Rear exhaust Long Cylinder design (45mm), strong torque. Three speed power switch in forward and full power in reverse.



Model No:A315

Square Drive:1/2"

Free Speed: 7000Rpm

Working Torque:850 N.m

Air Inlet :1/4"

Air Hose(Id):3/8"



Air Consumption:20m³/h

Working Pressure:90psi 


AEROPRO has quickly risen to become an unrivaled global producer of air-powered devices including air tools, air spray gunair nailer, airless paint sprayer, and etc.

AEROPRO seeks independent sales agent to represent and market our industry-leading pneumatic tools. We support OEM, ODM, OBM customization, small order quantity is acceptable and samples are available.

Make any cooperation possible. Any services related to the product, inquire with us now! Sales@Aeroprotools.Com