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<blockquote data-quote="ossagp" data-source="post: 173235" data-attributes="member: 1650"><p>it is hard to tell what marking is on that screw head from the pic.&nbsp; the only ones I have seen with a single marking on them like that were used as an idexing point and were usually a specialty screw marked just for that.&nbsp; since it is not to common to use a a torque wrench on a phillps head screw (as opposed to bolts with six or eight sides)&nbsp; the procedure was to turn the screw down until contact with the retained surface is met and then go a set about 1/4, 1/2, 3/4 past that to obtain the necessary torque.&nbsp; the same applied to the hex head bolts in some cases as enough people in the field seemed to know that it took so many of them radial lines on some bolts to create the desired torque once the surface of the bolt hit a solid surface.&nbsp; That happened so much that some manuals for proprietary machines and proprietary hardware started listing it in manuals.</p></blockquote><p></p>

[QUOTE="ossagp, post: 173235, member: 1650"] it is hard to tell what marking is on that screw head from the pic. the only ones I have seen with a single marking on them like that were used as an idexing point and were usually a specialty screw marked just for that. since it is not to common to use a a torque wrench on a phillps head screw (as opposed to bolts with six or eight sides) the procedure was to turn the screw down until contact with the retained surface is met and then go a set about 1/4, 1/2, 3/4 past that to obtain the necessary torque. the same applied to the hex head bolts in some cases as enough people in the field seemed to know that it took so many of them radial lines on some bolts to create the desired torque once the surface of the bolt hit a solid surface. That happened so much that some manuals for proprietary machines and proprietary hardware started listing it in manuals. [/QUOTE]

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