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How Does A Twin Hammer Impact Wrench Work?


Need to tighten or loosen fasteners faster and with more power? The twin hammer impact wrench is the solution. Learn how this tool can make your work life easier.


Details of double hammer mechanism


In a traditional single hammer design, the compressed air powers a single hammer and anvil to deliver the impacting blows. This constant concussive pounding inevitably leads to accelerated wear on components over time.


Twin hammer technology, as the name implies, utilizes two opposing hammers precisely timed to strike the anvil in rapid alternating succession. By spreading the force between two hammers, the stress and wear on each individual hammer is effectively halved compared to a single unit.


Here's how the double hammers operate: When the wrench is activated, the hammers slide back and forth on parallel rails inside the hammer cavity. As one hammer is driven forward by the spring force, its ramped surface strikes the opposing ramped surface of the other hammer. This transfers the energy, causing the struck hammer to slam into the anvil and rotate it a short distance before bouncing back.  


The opposing hammer is then propelled forward by the mainspring and the process rapidly alternates between the dual hammers, resulting in a continuous pounding force tremendously more powerful than a single hammer could generate.


The dual striking action also produces a distinctly smoother rotational force when mounted to fasteners. You can easily detect this smoothness during operation - a twin hammer wrench will exhibit a butter-smooth polar rotation compared to the jerkier impulses from single hammer models.


But the advantages go beyond just extending component life and refined operation. Twin hammers unlock another level of power density impossible with the older single hammer setup.


With their efficient doubled striking action, twin hammer mechanisms can achieve substantially higher free speed RPMs and higher instant torque output compared to equally-sized single hammer counterparts. In other words, you get more "oomph" per physical unit of tool size.


Of course, all this furious hammer-on-anvil banging would be for naught if the force didn't get transmitted to the socket and fastener. This is where the intricate inner and outer torx grooves come into play.


The torx grooves (named after their distinct star-pattern shape) are cut into the outer circumference of the anvil as well as the inner diameter of the socket. When the socket is pressed onto the anvil, these grooves interlock like machine-blazed puzzle pieces.  


As the anvil pounds in a circular motion, its grooved edges grind against the grooves in the socket, preventing any slippage or radial movement. This allows every last pulse of hammer force to be transferred as rotational torque, allowing the socket to obliterate the most sluggish rust-seized lug nut.


You may have noticed some sockets have deeper grooves than others. This design characteristic correlates to the socket's intended torque rating and application. Deeper grooves provide even more grip against the anvil, enabling extra torque transfer for heavy-duty tasks. Shallower grooves reduce surface friction for less demanding needs.


Since these impact wrenches hit anvils with so much tooth-jarring force, sockets must be able to withstand excessive vibration and torque loads. Standard chrome sockets can become dangerously brittle over time from the abuse, so it's best to use heat-treated impact-rated sockets for safe, reliable performance. It's also crucial the socket is fully pressed onto the anvil's grooved surface to properly interlock. Only then will 100% of the rotational force be transmitted to turn fasteners.


For most automotive and mechanical jobs, you just can't go wrong having a good RONGPENG R901 1/2 inch impact wrench in your toolbox.


The twin hammer impact mechanism generates up to 1000 ft-lbs of bolt-busting torque while weighing only 4.4 lbs. One hand forward/reverse switch with three position speed control. Equipped with advance process, it ensures longer service life for use and there is no special need of maintaining. 


For vehicle repair, construction sites and Industrial factory with sockets. R901 is deal for any automotive application, whether removing wheel nuts or performing maintenance on suspension components, motor or gear boxes.


Model No:R901

Square Drive:1/2"

Capacity Bolt Size:5/8”(16mm)

Free Speed: 7000Rpm

Working Torque:1000Ft-Lb(1356 N.m)

Air Inlet :1/4"

Air Hose(Id):3/8"

Avg.Air Consumption: 6.5cfm,183.9 l/Min

Sug.air Comp: 3HP

Net Weight: 4.4Lbs(2.0kg)

Overall Length: 185mm

Recommended Air Pressure: 90PSI (6.3bar)

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

RONGPENG 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! Rongpeng@Rongpeng.Com