How to Use

An es­sen­tial tool that en­sures your car is clamped to­gether cor­rectly

Practical Classics (UK) - - CONTENTS -

Learn how to work your torque wrench prop­erly.

Torque units Us­ing the torque wrench Tech Tip Why torque is im­por­tant Tech Tip Torque is a ro­ta­tional force mea­sured in New­ton me­tres (Nm) or pounds feet (lb ft). A 1m bar on a bolt with a 1kg mass sus­pended at the end would have a torque of 10Nm. A 1ft bar with 10lb at the end would have 10lb ft torque. Torque wrench de­signs dif­fer. The most com­mon type re­quires an in­ter­nal spring to be com­pressed un­til the ex­ter­nal scale reads the de­sired torque. Ap­ply an even force un­til the gauge in­di­cates the de­sired torque or it clicks – then stop. Stretch bolts may re­quire tight­en­ing to a spec­i­fied torque, then tight­en­ing by a num­ber of de­grees. Fas­ten­ers ex­ert clamp­ing force. A torque wrench in­di­rectly mea­sures this clamp­ing force by mea­sur­ing the twist­ing force as you tighten it. Your man­ual will state the cor­rect torques of key fas­ten­ers around your clas­sic. Read your man­ual care­fully as some met­ric read­ings may be in kg/m and some im­pe­rial read­ings in lb in.

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