31-10-2020, 11:05 AM
It is generally reckoned that artisans overtighten small bolts and undertighten large ones. 5/16 is small and and 1.5 inch is very large. Spanners should be of appropriate length. The very short ring spanners are a reasonable match for mild steel and the longer for HT. 11 hp SV Hillmans, with long stroke and heavy pistons, had 5/16 16 to 20 lbs ft.
If bolts are repeatedly tightened to near or beyond yield, fatigue clocks up in a very few cycles, whereas operating at modest tension accumulate none. Best to use a separate set for fittng bearings etc.
If bolts are repeatedly tightened to near or beyond yield, fatigue clocks up in a very few cycles, whereas operating at modest tension accumulate none. Best to use a separate set for fittng bearings etc.