True enough and point made: The other scenario is that the first Guest has been given a torque value which he's trying to achieve with either a hydraulic or pneumatic torque wrench. If this is the case, he's likely lost the pressure gauge overlay or torque chart for that particular wrench model and size (each wrench has a different chart/overlay). Best thing to do is to call up the manufacturer of the wrench, inform them of the tool model and and ask for the appropriate chart. Unfortunately, it's very doubtful that this would result in the proper preload: "Torque" has limited, or dubious at best, relationship to actual residual bolt load. Owing to myriad unknown friction factors and subsequent load transfers as adjacent bolts are tightened, a "properly torqued" (sic) bolt may in fact, either be too loose or too tight. Consequently, the integrity and reliability of the joint would be at risk. As pointed out in the earlier comment: The only way to ensure that you've got the required bolt load is to measure how much the bolt has stretched after being tightened and then, adjust accordingly. Many people are surprised at the variation in torque required to achieve consistent preload and distribution.