GPBox Posted July 2, 2011 Share Posted July 2, 2011 which part of a bolt should I measure to know what size it is ???? thanks G Link to comment Share on other sites More sharing options...
rj Posted July 2, 2011 Share Posted July 2, 2011 On the outside of the thread. It will be slightly under 4mm for M4 under 5mm for M5 Link to comment Share on other sites More sharing options...
GPBox Posted July 2, 2011 Author Share Posted July 2, 2011 thanks ! Link to comment Share on other sites More sharing options...
ECR Posted July 2, 2011 Share Posted July 2, 2011 You also need to be sure that it's a metric thread and not imperial (UNF) Link to comment Share on other sites More sharing options...
Sheds Moderator Posted July 3, 2011 Share Posted July 3, 2011 The easiest way to check if you can't do it by eye is to buy a selection box of fasteners in the common metric sizes and the same in UNF. You can then get an M5 nut out of the box and screw it onto the nut in question - if it goes on then you know its size and thread pattern. Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted July 3, 2011 Area Representative Share Posted July 3, 2011 If you know it's metric, you just look at it. Certainly it can be easy to confuse some metric and imperial but he depth and pitch usually give it away. If you adopt BOSS's solution make sure you label each set! Link to comment Share on other sites More sharing options...
ECR Posted July 3, 2011 Share Posted July 3, 2011 If it's a nylock (self locking) nut then GENERALY, if it's metric the nylon is blue and if imperial the nylon is white. I have come across exceptions but as I say, the rule generaly holds good. Link to comment Share on other sites More sharing options...
jakeandlizzy Posted July 4, 2011 Share Posted July 4, 2011 I'm sure you can get one cheaper somewhere else, but I keep one this handy -- here Link to comment Share on other sites More sharing options...
Michael G Posted July 4, 2011 Share Posted July 4, 2011 Also from the Pro-Bolt website. All you need to know! here Link to comment Share on other sites More sharing options...
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