®
Model #
24350
STORE THIS MANUAL IN A SAFE
PLACE FOR FUTURE REFERENCE
TORQUE WRENCH
OPERATOR’S MANUAL
• At low torque settings, pull wrench slowly to observe click.
Please read and understand entire manual, including all safety information, before using torque
wrench. This tool is a precision measuring instrument. Handle with care and store properly. Do not
attempt to increase leverage of this wrench with any other device. Failure to follow all instructions
could result in damage to torque wrench, property damage, or injury.
• Wrench is shipped ready to use, calibrated and tested to an accuracy of +/- 4%. To maintain this
accuracy, it is important that wrench is stored at lowest torque setting, 50 .-lb (67.8 Nm).
This setting relieves extra tension on the internal spring, eliminating fatigue that can adversely
affect accuracy.
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MICROMETER SCALE
HANDLE BODY
MAIN SCALE
KNURLED HANDLE
LOCK NUT
Fig. A
125
175
75
225
275
150
200
250
300
100
50
STORE AT
50 FT. - LB.
FT.-LB.
TURN
125
175
75
225
275
150
200
250
300
100
50
STORE AT
50 FT. - LB.
FT.-LB.
TURN
Fig. B Fig. C
WRENCH OPERATION
Fig. D illustrates the basic operation of the torque wrench. For accurate operation, grasp the knurled handle only and apply
pulling force. When the desired torque setting is reached, the roller bearing and roller pin will roll over each other, causing a
click you can hear and feel. NOTE: At low torque settings, click can be subtle. Use wrench in a quiet environment.
1. Install proper socket/attachment to square drive. Place socket on nut/bolt to be tightened.
2. Operate torque wrench the same as a standard socket wrench to tighten nut/bolt. As nut/bolt becomes snug, slow
operation to a smooth, steady pull. Operating wrench too quickly or with too much force may cause you to miss the
exact torque setting. At the instant the wrench clicks, torque setting has been reached. Stop pulling wrench and
release pressure on handle. Do not continue to pull aer torque setting is reached. Doing so will overtighten the
nut/bolt and could damage wrench. Once pressure is released from the handle, wrench will automatically reset for
next operation. NOTE: At low torque settings, use extra care to release wrench at the proper point aer it clicks.
3. Wrench does not measure torque below 50 .-lb./67.8 Nm.
4. Do not use wrench to break free stuck fasteners.
SETTING TORQUE READING
This is a dual-range torque wrench marked with
foot pounds (.-lb.) and Newton meters (
Nm
)
on opposite sides of handle.
The torque scale is marked on the handle body
with more precise subdivisions on the knurled
handle (Fig. A). In these instructions the handle
body scale will be referred to as the “main
scale” and the knurled handle scale will be
referred to as the “micrometer scale”.
Tighten/adjust lock nut and knurled
handle by hand only.
Foot Pounds (Example reading: 120 .-lb.)
1. Locate lock nut on the end of handle.
Unlock knurled handle by turning lock
nut counterclockwise.
2. COARSE SCALE ADJUSTMENT (Fig. B):
Using .-lb. scale
, turn knurled handle until
its
top edge is even with the horizontal
“
100
” mark on main scale and the “0” mark
on micrometer scale is centered on vertical
line of main scale.
3. FINE SCALE ADJUSTMENT (Fig. C):
The micrometer scale divides the main scale markings into 25 divisions.
Every micrometer scale marking equals 1 .-lb., also known as the minimum increment. To increase torque from
100 to 120, turn micrometer handle clockwise until "20" mark is centered on vertical line of main scale.
100 .-lb. (main scale) + 20 .-lb. (micrometer scale) = 120 .-lb.
4
. Lock torque setting by turning lock nut clockwise until snug. Wrench is now set to measure
120
.-lb. of torque
and ready to use.
Newton Meters (Example reading: 145 Nm)
Setting desired torque on the Nm scale uses the same procedure described above for .-lb. scale. The micrometer scale
divides the main scale markings into 25 divisions. Every micrometer scale marking equals 1.35 Nm, also known as the
minimum increment.
To set a torque value of 145 Nm, turn knurled micrometer handle until top is aligned with “135.6” mark on main scale and
the “0” mark on micrometer scale is centered on vertical line of main scale. To increase torque from 135.6 to 145, turn
micrometer handle clockwise until the “7” mark is centered on vertical line of main scale. 145 Nm - 135.6 Nm = 9.4 Nm.
9.4 Nm / 1.35 Nm = 7 micrometer scale markings. Wrench is now set to measure 145 Nm of torque and ready to use.
Fig. D
WRENCH ROTATION
HANDLE
PIVOT
POINT
Torque is measured
in CLOCKWISE
direction only
"CLICK"
MAINTENANCE AND STORAGE
1. If wrench has not been used for a long period of time, operate it several times at
a low torque setting. This will allow internal lubricant to recoat moving parts.
2. When wrench is not in use, keep adjustment at lowest torque setting,
50 .-lb./ 67.8 Nm
(Fig. E).
Do not turn handle below lowest torque setting.
3. This wrench is a precision measuring instrument. Take care to operate wrench
correctly. Store in a clean, dry environment.
4. Clean wrench by wiping with a clean, dry, lint-free cloth. Do not immerse in any
type of liquid or cleaner. This may damage the internal components of the wrench.
Fig. E
125
175
75
225
275
150
200
250
300
100
50
STORE AT
50 FT.-LB.
FT. - LB.
TORQUE UNIT CONVERSION TABLE
60
120
180
240
300
360
420
480
540
600
660
720
780
840
900
960
1020
1080
1140
1200
1260
1320
1380
1440
1500
1560
1620
1680
1740
1800
1860
1920
1980
2040
2100
2160
2220
2280
2340
2400
2460
2520
2580
2640
2700
2760
2820
2880
2940
3000
3060
3120
3180
3240
3300
3360
3420
3480
3540
3600
3660
INCH
POUNDS
(in.-lb.)
6.78
13.55
20.33
27.11
33.89
40.67
47.45
54.23
61.01
67.79
74.56
81.34
88.12
94.90
101.68
108.46
115.24
122.02
128.80
135.58
142.36
149.13
155.91
162.69
169.47
176.25
183.03
189.81
196.59
203.37
210.15
216.93
223.70
230.48
237.26
244.04
250.82
257.60
264.38
271.16
277.94
284.72
291.50
298.27
305.05
311.83
318.61
325.39
332.17
338.95
345.73
352.51
359.29
366.07
372.84
379.62
386.40
393.18
399.96
406.74
413.52
NEWTON
METERS
(Nm)
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
205
210
215
220
225
230
235
240
245
250
255
260
265
270
275
280
285
290
295
300
305
FOOT
POUNDS
(.-lb.)
FOOT
POUNDS
(.-lb.)
2.08
4.17
6.25
8.34
10.41
12.50
14.58
16.67
18.75
20.83
22.91
25.00
27.08
29.17
31.25
33.33
35.41
37.50
39.58
41.67
43.75
45.83
47.91
50.00
52.08
54.16
56.25
58.33
60.41
62.50
64.58
66.67
68.75
70.83
72.91
75.00
77.08
79.16
81.25
83.33
NEWTON
METERS
(Nm)
2.82
5.65
8.47
11.29
14.12
16.94
19.77
22.59
25.42
28.24
31.07
33.89
36.72
39.54
42.37
45.19
48.01
50.84
53.66
56.49
59.31
62.14
64.96
67.79
70.61
73.44
76.26
79.09
81.91
84.73
87.56
90.38
93.21
96.03
98.86
101.68
104.51
107.33
110.16
112.98
INCH
POUNDS
(in.-lb.)
25
50
75
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
475
500
525
550
575
600
625
650
675
700
725
750
775
800
825
850
875
900
925
950
975
1000
442.53
531.04
619.55
708.06
796.56
885.07
973.58
1062.09
1150.59
1236.10
1327.61
1416.12
1504.62
1593.13
1681.64
1770.15
1858.65
1947.16
2035.67
2124.17
2212.68
2301.19
2389.70
2478.20
2566.71
2655.22
2743.73
2832.23
2920.74
3009.25
3097.76
3186.26
3274.77
3363.28
3451.79
3540.29
3628.80
3717.31
3805.82
3894.32
3982.83
INCH
POUNDS
(in.-lb.)
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
NEWTON
METERS
(Nm)
36.87
44.25
51.63
59.00
66.38
73.75
81.13
88.50
95.88
103.25
110.63
118.01
125.38
132.76
140.13
147.51
154.88
162.26
169.64
177.01
184.39
191.76
199.14
206.51
213.89
221.26
228.64
236.02
243.39
250.77
258.14
265.52
272.89
280.27
287.64
295.02
302.40
309.77
317.15
324.52
331.90
FOOT
POUNDS
(.-lb.)
CONVERSIONS
1 .-lb. =
0.138 m-kg
12.0 in.-lb.
1.355 Nm
13.82 cm-kg
1 Nm =
0.7375 .-lb.
8.8507 in.-lb.
0.1019 m-kg
10.19 cm-kg
1 in.-lb. =
0.0833 .-lb.
0.1129 Nm
0.0115 m-kg
1.1521 cm-kg
NOTE: Exploded view diagram provided for illustration purposes only. Do not
disassemble any part of torque wrench. There are no user serviceable parts on
or inside wrench. Parts shown and assembly may differ slightly based on model.
0
2
4
RATCHET PAWLS
AND SPRINGS
RATCHET ARM
RETAINING
RING
HANDLE BODY
ROLLER
BEARING
ROLLER PIN
ADJUSTMENT
SPRING
RATCHET
FACE PLATE
RATCHET
GEAR/DRIVE
FACEPLATE
SCREWS
PIVOT PIN
RUBBER
O-RING
LOCKING
SHAFT
KNURLED
HANDLE
LOCKING LUG
ASSEMBLY
WASHER
LOCK NUT
POMMEL NUT
CALIBRATION
SCREW
PIN
PIN
PLASTIC
CAP
Drive 3/4 in.
Ratchet 24 Tooth
Length 26.3 in.
Dual Range 50 - 300 .-lb. / 67.8 - 406.7 Nm
Increment 1 .-lb. / 1.35 Nm
Accuracy +/- 4%
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TEKTON.COM
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Grand Rapids, MI 49548
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