Cautions
A. Always wear appropriate safety equipment when using any hand tool.
B. Only use hand tools for their intended purpose.
C. NEVER EXCEED the rated capacity of the tool.
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Operating Instructions
Micrometer Adjustable Torque Wrench Series (SDR, SD, & CCM)
Sturtevant Richmont (SR) micrometer adjustable torque wrenches are designed and manufactured to provide
consistent and rapid user-selectable torque in a variety of manufacturing and maintenance operations. They
meet or exceed ASME B107.300 and ISO 6789, and AS28431. These wrenches are accurate to +/- 4% of indi-
cated value from 20% to 100% of capacity.
The Ratchet and Square Drive tools operate and deliver torque in one direction only, as indicated by the arrow
on the case (Figure 1). The wrench will not indicate torque but can be used in the reverse direction, provided
you do not exceed the rated capacity of the wrench. The Dovetail series can be used in either direction with
the same accuracy by removing the head and turning the wrench 180 degrees.
Capacity and Range
The range of each tool is from 20% to 100% of the rated capacity of the tool. The rated capacity of the tool is
the highest value shown on the major scale in the unit of measure for the tool.
Torque Setting
The case (Figures 1 & 2) is engraved with graduations (major scale) and the aluminum grip with increments
(minor scale). The torque setting is the sum of the largest graduation below the end of the aluminum grip plus
the increment aligned with the centerline of the graduations. One complete revolution of the grip is equal to
one graduation on the major scale.
To set the desired torque, rotate the lock control knob (Figure 3) clockwise (CW) until the grip can be readily
rotated.
Next, grasp the case rmly with one hand and rotate the Knurl-Grip handle clockwise (CW) to increase torque
or counter-clockwise (CCW) to decrease torque. Once the desired torque has been set, lock the lock control
knob by rotating it in the CCW direction until it stops. Recheck torque to confirm proper setting.
Interchangeable Head Capacity
Always use an interchangeable head with sufcient capacity for the torque to be applied. Each interchange-
able head is marked with the maximum capacity of the head. For heads having a fastener engagement size
in English units of measure, the capacity is always given in inch-pounds. For those with fastener engagement
size given in SI units, the capacity is always given in Newton Metres.
Figure 1
Figure 3
Figure 2
Part # 857451
March 8, 2017 Rev B
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