Document P/N:
2P42520
Release Date:
07/11/2016
Revision: D
14 of 22
Installation Equipment, Accessories & Specifications continued
E) Manual Torque Wrench – SPM
®
recommends the use of a manual adjustable torque wrench to verify the
calibration of the Torque Regulating Bar. If this extension is not available, the manual torque wrench must be
used on each assembled Safety Iron
®
connection in order to verify the proper torque.
Each manual torque wrench has a 1/2" drive (or larger) in order to more easily match sockets used for the
impact wrench. The following pneumatic torque wrenches are recommended by SPM
®
for use in the assembly
of Safety Iron
®
:
Manual Torque Wrench Specifications
Safety
Iron
®
Size
Pressure
Rating
(PSI)
Socket Size
(in)
Torque
Capacity
(ft-lbs)
2"
15K
1/2"
50 to 250
3"
15K
1/2" or 3/4"
50 to 400 +
4"
10K
1/2" or 3/4"
50 to 400 +
4"
15K
1"
100 to 700
Manual Torque Wrench Specifications
F) Torque Regulating Bar Calibration Procedure - Due to variations in the operating characteristics of impact
wrenches, the torque level achieved by the torque stick should be verified before each job. It is important that a
regulator be installed on the compressor to allow for adjustments necessary to complete the calibration
procedure.
a. Adjust the air pressure delivered to the impact wrench so that the tool is operating at 90 - 100 psi at
the tool when the trigger is pulled. Note: the regulator may require a higher setting to maintain this
pressure.
b. Using the Torque Regulating Bar on the impact wrench, tighten a clamp bolt until the bar stops
turning.
c. Set a calibrated torque wrench to the maximum bolt torque allowed per the manual.
d. Check the clamp bolt with the hand torque wrench. The wrench should rotate before clicking is heard.
If clicking occurs without rotation, the torque is excessive and the system air pressure must be reduced.
e. Set a calibrated torque wrench to the minimum bolt torque allowed per the manual.
f. Check the clamp bolt with the hand torque wrench. The wrench should not rotate before clicking is
heard. If rotation occurs before the clicking, the torque is insufficient and the system air pressure must
be increased.
