2) If the material of the male screw is .S43C, the tightening torque is as in Table 2. Table 2 Unit: kgm Steel Cast iron Light alloy l/8 1.2 - 2.5 1.0 - 2.0 0.7 - 1.5 l/4 2.0 - 4.5 1.7 - 3.8 1.3 - 2.9 3/8 4.5 - 9.5 3.8 - 7.9 2.8 - 6.0 II2 I 10.0 - 19.2 I 8.5 - 16.1 I 6.2 - 11.8 314 I 17.4 - 32.3 I 14.4 - 25.2 I 10.8 - 19.0 1 37.5 - 62.5 31.6 - 52.5 24.0 - 40.0 3) Tightening torque for rubber hoses with taper seal Unit: kgm (Nm) Index No. 02 03 04 05 06 10 12 14 Suitable tightening 25kO.5 5+2 8k2 14*3 18+5 20*5 25r5 30+5 torque (24.5k4.9) (49+19.6) (78.5k19.6) (137.3+29.4) (176.5+-49) (196.1*49) (245.2+49) (294.2+39) 4) Be careful to assemble the rubber hoses without twisting. 28