Hi guys------ Regarding the Metrinch System, ANDERS--- I think you might have missed the "point" here ( that's a v. poor attempt at a joke by a sad,auld git ie ME !!)--- This system is designed to transmit the torque via the centre---or as near to----of the flat. Please have a look at this }--------------
http://www.serenco.nl/en/Metrinch-text/ ------------------...They are not supposed to fit "exactly" and interchangeablity between the different thread systems wasn't part of the design remit either.. ...The designers have a demonstration in which they over-tighten a nut, grind all the corners off, then try first a Mono-Hex socket, then a Bi-Hex socket, then a Metrinch socket. Guess which one did the job ??......Yes, a ring spanner is generally the best tool overall BUT }----a) It needs to be one that is FLAT,(So the torque is applied in the same plane) not where the head is angled to the shaft(which tends to induce a twist to the spanner).. and----b)If there is the slightest clearance then we are back to "Point-loading" again, and I doubt if any production spanner fits THAT well ???...... LES H ('mornin there, matey !!) has picked up on an overlooked item Viz.}--- the slight taper at the edge of a socket or ring spanner....In some of the smaller sizes this can account for almost 1/4 of the depth of flat...Also, that slight turn clockwise does actually work in some cases !! ( Maybe not if Loctite has been used). Odd, but true.....Tut-tut, FRANK---Come-on, old son, that's defeatist talk.... Imagine this scenario}--- You're in mid-Atlantic, the ships' engines have stopped and that bolt HAS to come out. How are you going to do it ?? That's how I tend to view a job.... but then I'm Ex-RN Engines anyway. OK, I'll shove-off now.Heave-ho me hearties !!!!!!!
