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Specifications
Specifications at 90 psig (6.2 bar, 620 kPa)
Square Drive Size
MG325 .........................................................3/8"
MG3255 .......................................................1/2"
MG3255L .....................................................1/2"
MG3255P ....................................................1/2"
Torque
Clockwise ......................... 225 lbs. ft. (300 N•m)
Counterclockwise.............. 325 lbs. ft. (440 N•m)
Recommended Air Pressure
................. 90 psig (6.2 bar, 620 kPa), maximum
Bolt Breakaway Torque ..........425 lbs.ft (576 N•m)
Air Consumption, Working ...... 2.4 cfm (17 SCFM)
RPM, Free Speed CW (CCW) ......... 8,200 (10,700)
Blows per Minute .........................................1,400
Air Inlet Thread Size ......................... 1/4"–18 NPT
Air Supply Hose Size ........... 3/8" (9.5 mm) ID min
Dimensions
Height ..........................................7.0" (17.8 cm)
Length (MG325/MG3255) ............6.1" (15.5 cm)
Length (MG3255P) ......................6.4" (16.3 cm)
Length (MG3255L) ......................7.6" (19.3 cm)
Width .............................................2.1" (5.3 cm)
Weight (MG325/MG3255/MG322P) .2.8 lbs (1.3 kg)
Weight (MG325L) ..............................2.9 lbs (1.3 kg)
Noise* (Tested in accordance with ISO 15744)
Sound Pressure Level (A) .......................99.1 dB
Uncertainty, K ...........................................3.0 dB
Sound Power Level (A) .........................110.7 dB
Uncertainty, K ...........................................3.0 dB
Sound Pressure Level [Muffler] (A) .........90.3 dB
Uncertainty, K ...........................................3.0 dB
Sound Power Level [Muffler] (A) ...........101.9 dB
Uncertainty, K ...........................................3.0 dB
Vibration* (Tested in accordance with ISO 28927)
Vibration Level ...................................... 4.5 m/s
Uncertainty, K ........................................0.4 m/s
*These declared values were obtained by
laboratory type testing with the stated standards
and are not adequate for use in risk assessments.
Values measured in individual work places may be
higher. Values and risk of harm experienced by an
individual user are unique and depend upon the
environment and manner in which the user works,
the work piece and the workstation design, as well
as upon the exposure time and the physical
condition of the user.
Snap-on disclaims liability for the consequences of
using the declared values, instead of values
reflecting the actual exposure determined in an
individual risk assessment in a work place situation
over which we have no control.
ZMG325CE Rev. J
Applications
The Snap-on MG325/MG3255/MG3255L/MG3255P
Impact Wrench is ideal for a wide variety of fastener
turning jobs in both automotive and industrial fields.
When used with Snap-on impact sockets, they provide
power and speed for greater job efficiency and less
operator fatigue. Applications include assembly line
operations, removal of rusted-on nuts and bolts and
many other specialized uses.
Air Compressor
The air compressor should have sufficient capacity to
deliver 4.0 cfm (28 SCFM) at 90 psig (6.2 bar, 620 kPa) at
each outlet while the tool is running. The receiver tank
should have sufficient capacity to provide surge balance
for each air tool.
Air Strainer
An air strainer is built into the removable air inlet bushing
located at the rear of the impact wrench. To clean,
remove the bushing and use an air hose to blow dirt and
other particles from the screen and bushing. Before
reinstalling the air inlet bushing, check the O-ring for
damage. If it is damaged, replace it with a new O-ring to
prevent air leakage. Torque reinstalled air inlet bushing to
50–55 lbs. ft. (68–75 N•m).
Air Supply
The pneumatic impact wrench operates best on clean,
moisture-free, well-lubricated air at a constant pressure
of 90 psig (6.2 bar, 620 kPa) maximum.
2
2
A – Receiver Tank, Minimum 40 Gallons
(151.5 liters)
B – Compressor, Sufficient Capacity
C – Drain, Daily
D – Pipe and Fittings, Minimum 1/2"
E – Top Air Intake
F – Shut Off Valve, Easily Reached
G – Filter
H – Air Regulator, Set at Working Pressure
I – Lubricator
J – Air Tool Connection
K – Low Spot, Water Trap
L – Drain, Daily
4
Figure 1: Air Supply
(05/21)
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