Sturtevant Richmont: Knurl-Grip

Knurl-Grip: Metal Handle Conversion Kit Instructions

For Sturtevant Richmont Micrometer
Adjustable Wrenches (Up To 250 Ft. Lb.)

Accuracy. Reliability. Durability.

Required Tools

• Work Gloves
• 7/64”, 3/32”, 5/32”, and 5/16” hex key
• Internal Straight Tip Ring
  Pliers (3/8”–1” or 10–25 mm)
• Torque Wrench for 15 Ft. Lb., 5/16 hex bit socket
• Hex head screwdriver
• Locktite®

Process Overview

The old griplock must be removed prior to removing the rubber grip and installing the new handle.

Calibration Process

Use a mechanical loader with a tester possessing an accuracy of at least +/-1%. A more accurate tester is always preferable.

Procedure
1. Determine current performance to standard.
    • Test wrench on torque analyzer/tester.
– Cycle wrench at 100% of capacity a minimum of three times.
– Set wrench to 20% of capacity, cycle three (3) times and record readings.
– Set wrench to 60% of capacity, cycle three (3) times and record readings.
– Set wrench to 100% of capacity, cycle three (3) times and record readings.
    • Compare readings to tolerance for each torque level.
– If wrench is within tolerance, it may be returned to service.
– If wrench is out-of-tolerance, go to next step.

2. Calibrate wrench.
a. Remove tang access screw.
b. Remove griplock control knob and hex stem lock.
c. Rotate aluminum grip to 100% of capacity (highest graduation + 0 on increment).
d. Place wrench on torque analyzer/ tester, click several times, note values obtained.
e. Adjust wrench.
– If readings are above tolerance, turn tang adjustment screw slightly CW, then repeat step 2d.
– On the models highlighted on the last page there is a second set screw that is used as a jam nut. That (jam nut) set screw needs to be removed in order to make the calibration adjustment.
– If readings are below tolerance, turn tang adjustment screw slightly CCW, then repeat step 2d.*
– If readings are in tolerance, go to next step.
f. Rotate grip and adjust torque to 20% of capacity (lowest graduation + 0 on increment).
g. Place wrench on torque analyzer/ tester, click several times, note values obtained.
– If out-of-tolerance, go to next step.
– If in tolerance, check at 60% and 100% of capacity.
h. Rotate grip CW or CCW enough clicks to bring into tolerance at 20% of scale.
i. Lock load screw by rotating internal 5/32” internal hex screw in the CCW direction.
j. Use 5/16” hex key to remove lock plug by rotating in the CCW direction.
k. Rotate grip until it aligns with lowest graduation + 0 increment (20% of capacity).
l. Replace lock plug using torque wrench, torque lock plug to 15 Ft. Lb.
m. Return to step 2c.
n. Replace hex stem, lock control knob and lock control knob set screws. Tighten to 12.5 In. Lb.
o. If necessary, tighten setscrew in lock control knob until it lightly touches bottom, then back off 1/4 to 1/3 turn.
p. Replace tang access screw and grip.

Step One

Turn handle to minimum torque position and lock the handle

Step Two

Loosen the set screw using the 3/32 hex key in the back of the griplock eight turns. To release tension gently tap griplock.

Step Three

Using an internal straight tips retainer ring pliers, (3/8”–1” or 10–25 mm) squeeze and remove the snap ring, griplock and hex stem lock.

Step Four

Using 5/16 hex bit socket to remove lock plug. Pull the handle straight back and remove from wrench.

Step Five

Slide the new handle on to the wrench. Be sure to align the handle with the “0” sightly to the left of the scale center line. Using the torque wrench set to 15 Ft. Lb. and the 5/16 hex bit socket, torque lock plug to 15 Ft. Lb. Check calibration and if necessary recalibrate wrench. Please note that the new load point for both usage and calibration is here. 

Step Six

Select the correct hex stem lock from the conversion chart* for the model you are converting. Hold wrench in a vertical position as shown. Insert the hex stem lock into the hex opening in the lock control knob. Gently rotate knob with inserted hex key to complete engagement with locking screw inside of the load screw assembly.
NOTE: It is important that you DO NOT unlock the handle during this process.

Step Seven

Torque griplock set screws using 7/64 hex key to 12.5 In. Lb. or until snug. To test lock after full assembly: Place in vertical position with handle facing upwards. If the set screw is sticking out of the lock knob, or the hex is too short, replace the hex stem lock with the other supplied hex stem lock in the grip kit.

Step Eight

Apply “Locktite® 222” threadlocker to the 5/16”–18 x 5/16” set screw thread. Tighten set screw into the lock knob using 5/32 hex key so it contacts, or stops with the top face of the hex key, then rotate it back 1/4–1/3 of one turn. Let the Locktite® dry for 12 hours.

Tips

1. Be sure to exercise the wrench at least three (3) times prior to testing at both the low and high end of the scale.
2. Align the load point and the center of the pillar on the tester.
3. Keep the speed of testing consistent.
4. Be sure to return the tester to the neutral position so the wrench is completely released.
5. After testing the wrench on the mechanical loader use the same transducer and test by hand. Your readings should be very close.
6. When calibrating the high end of the wrench scale, set the wrench slightly over capacity. The wrench will slightly settle down to the desired capacity. If the wrench has a 150 Ft. Lb. capacity calibrate the high end for 152 Ft. Lb.
7. Always have the lock knob tightened or locked for testing. Turn CCW to lock.

*Each Grip Kit comes with both Hex Stems. The “Hex Stem Used” column designates which Hex Stem is needed with each wrench.

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