Clarke CHT952 User guide

½”TORQUE WRENCH SET

MODEL NO: CHT952

PART NO: 1801952

USER INSTRUCTIONS

ORIGINAL INSTRUCTIONS GC09/24

INTRODUCTION

Thank you for purchasing this CLARKE Torque Wrench. It should NOT be used for
UNDOING nuts, as severe damage could occur. With correct use, this tool will produce
an accuracy of plus or minus 4%. You can hear and feel when the desired torque
setting has been reached. With careful and considerate use, the wrench will give
years of reliable service.

GUARANTEE

This CLARKE product is guaranteed against faulty manufacture for a period of 12
months from the date of purchase. Please keep your receipt as proof of purchase.

This guarantee is invalid if the product is found to have been abused or tampered
with in any way, or not used for the purpose for which it was intended.

Faulty goods should be returned to their place of purchase, no product can be
returned to us without prior permission.

This guarantee does not effect your statutory rights.

USING YOUR TORQUE WRENCH

Hold the torque wrench in your left hand (if right handed) so that the required scale ­foot/pounds or Newton/metres - is uppermost and visible.

Turn the knurled locking screw at the end of the handle anticlockwise to unlock the
knurled adjusting grip.

Turn the adjusting grip to select the torque setting as follows. For a required setting
of for example, 56ft/lb: turn the grip until top the edge of the grip is level with the
50ft/lb line on the handle scale and the zero graduation on the grip is aligned with the
centre-line of the main handle scale.

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Parts & Service: 020 8988 7400 / E-mail: [email protected] or [email protected]

Rotate the handle further, clockwise, until the ‘6th’ graduation on the grip is aligned
with the centre-line to give a setting of 50 + 6 = 56ft/lb.

NOTE: If using the ‘N/m’ scale then each division on the grip graduation is equivalent
to 1.36N/m.

Therefore to set wrench at 76N/m: Turn the grip until the top edge of the grip is level
with the 67.8N/m line on the handle scale and the zero graduation on the grip is
aligned with the centreline of the handle scale.

Rotate the handle further, clockwise, until the ‘6th’ graduation on the grip is aligned
with the centreline to give a setting of 67.8 + (6 x 1.36) = 67.8 + 8.2 = 76N/m.

Tighten the locking screw at the end of the handle to prevent accidental alteration of
the setting.

When tightening the nut/bolt you will feel and hear the wrench mechanism click when
the set torque is reached. Immediately stop applying force to wrench to avoid over­tightening the nut/bolt. The wrench will reset ready for the next application.

CARE OF THE WRENCH DURING USE

1. Insert the square drive into the socket, perpendicular to the nut/bolt to be
tightened. Smoothly tighten your fastening, applying even pressure throughout.

2. ALWAYS use the correct size socket for the fastening and NEVER use sockets
that are damaged. Sockets, adaptors and extensions must be robust enough for
exposure to the maximum possible torque.

3. Grasp the torque wrench handle and pull on the wrench with steady movements.
Always pull the wrench. DO NOT push the wrench handle. NEVER use with wet
hands.

4. Check that the wrench operating range is adequate for the anticipated load before
proceeding. DO NOT exceed the maximum rating of the wrench.

5. NEVER use the wrench to undo bolts & nuts which may be excessively tight. Very
tight nuts and bolts should be loosened with a standard wrench and the torque
wrench used only for re-tightening.

6. DO NOT expose to extreme temperature or humidity for extended periods.

7. Avoid using universal joints as these could result in inaccurate torque readings.

Each torque wrench has been lubricated before leaving the factory. If the wrench has
not been used for some time, operate it several times allowing the lubricant to re-coat
the internal working parts.

• After use, keep adjustment at lowest torque setting and do not turn handle

below lowest torque setting.

• Clean by wiping the tool with a soft cloth. NEVER immerse it in water or

any type of solvent or cleaning fluid. Store in a clean, dry environment
away from excess heat, humidity or dust.

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Parts & Service: 020 8988 7400 / E-mail: [email protected] or [email protected]

• The wrench has been calibrated at the factory order to ensure accurate

readings and should not require any re-calibration. The original calibration
certificate should be supplied.

CONVERSION TABLES

Newton Metres
(Nm)

2 1.48 0.203 20.39

3 2.21 0.305 30.59

4 2.95 0.407 40.78

5 3.69 0.509 50.98

6 4.43 0.611 61.18

7 5.16 0.713 71.38

8 5.9 0.815 81.57

9 6.64 0.917 91.77

10 7.38 1.019 101.97

11 8.11 1.112 112.16

12 8.85 1.122 122.36

13 9.59 1.132 132.56

14 10.33 1.142 142.76

Pound/Foot
(lbf.ft)

Kilogram Metres
(kg/m)

Kilogram-force
Cm

15 11.06 1.152 152.95

16 11.8 1.163 163.15

17 12.54 1.173 173.35

18 13.28 1.183 183.54

19 14.01 1.193 193.74

20 14.75 2.039 203.94

21 15.49 2.141 214.14

22 16.23 2.243 224.33

23 16.96 2.345 234.53

24 17.7 2.447 244.73

CONVERSION FORMULAE

1kg cm = 13.887 oz/in 1Nm = 14.161oz/in
1kg cm = 0.08677 lbf /in 1Nm = 8.8507 lbf/in
1kg/m = 7.233 lbf/ft 1Nm = 0.73756 lb/ft

1kg cm= 0.098 N/m 1 kgm = 9.80665 N/m

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Parts & Service: 020 8988 7400 / E-mail: [email protected] or [email protected]