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Ebay - Buyer beware
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<blockquote data-quote="ray vinmad" data-source="post: 37121" data-attributes="member: 32"><p>I might be being pedantic about 60 year old threads, but it doesn't matter whether it goes in the hole or not, an M6 screw will go in a 1/4" BSF hole, but it's miles undersize & the wrong pitch.</p><p>The theory is that when you tighten a nut & bolt it is the flanks that lock it up & do the work. If you have always used 55deg screws before, a 60deg thread will be making a helical line contact until it deforms the ally enough to hold. i.e. it will only lock up on the flank face once the ally has burred over. So don't be surprised if you have to retighten them a few times before they `fit'.</p><p></p><p>Ray</p></blockquote><p></p>
[QUOTE="ray vinmad, post: 37121, member: 32"] I might be being pedantic about 60 year old threads, but it doesn't matter whether it goes in the hole or not, an M6 screw will go in a 1/4" BSF hole, but it's miles undersize & the wrong pitch. The theory is that when you tighten a nut & bolt it is the flanks that lock it up & do the work. If you have always used 55deg screws before, a 60deg thread will be making a helical line contact until it deforms the ally enough to hold. i.e. it will only lock up on the flank face once the ally has burred over. So don't be surprised if you have to retighten them a few times before they `fit'. Ray [/QUOTE]
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