The drawings for making these tools, arranged in numerical order, occur at the end of each volume. TIGHTENING TORQUES These torques are expressed in : - Metre-Newtons (m AN) , the legal in France - Metre-Kilogramme since most torsion-spanners in current use are so graduated 1 = 9.81 mAN exactly The figures quoted are “rounded off’, taking 1 at 10m AN, thus: 2mAN is taken to equal 0.2 (1.4 ft. Ibs) 60m AN is taken to equal6 (43 ft. lbs)