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Rifles, Reloading, Optics, Equipment
Gunsmithing
Action Screw Torque????
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<blockquote data-quote="NesikaChad" data-source="post: 461009" data-attributes="member: 7449"><p>It's easy to disregard most of this and whittle it down to saying "it's just a fricken deer rifle." Thankfully that position isn't taken by engineers who design stuff most of us take for granted when flying commercial or cruising around under the arctic circle. </p><p></p><p>Take it for what its worth, but this is what I learned:</p><p></p><p>I'm fortunate to have some pretty smart fellers for friends. One in particular lives in the Seattle area and makes a very comfortable living designing, developing, and evaluating fasteners for aerospace and nuclear submarine applications. </p><p></p><p>About 8 years ago I asked for his help on this very question. First, there isn't a "blanket answer" that covers everything. For the sake of this discussion we'll use a particular screw.</p><p></p><p>1/4-28 made from 300 series stainless. Popular now with many of the custom actions.</p><p></p><p>With this particular fastener you don't exceed 40 inch pounds. Period. If you do the fastener will yield because it exceeds the tensile loading capacity of the threads and you end up only chasing problems that really don't exist.</p><p></p><p>Different materials have varying degrees of lubricity, tensile strength, and surface hardness. All of which play into this.</p><p></p><p>You also must take into consideration the thread pitch. This is where friction coefficients, flank surface area, and shear angles also become important. Not to mention root diameters vs major diameter and the torsional/shear loading applied to the cylinder/shaft portion of the fastener.</p><p></p><p>Be that as it may if you sit and do the math the numbers are pretty close. One does not clearly outshine the other.</p><p></p><p>Don't forget also that the threads in the receiver are just as capable of being influenced. A kryptonite fastener is only as effective as what its being screwed into.</p><p></p><p>Excessive screw torque is attempting to mask a larger underlying problem: Poor bedding and/or incompatibility of components.</p><p></p><p>If your building a spaghetti M700 in a boomer with a barrel that resembles the axle out of an excavator in a featherweight sporter stock, then its likely the gun will perform poorly no matter how much tension is put on the guard screws.</p><p></p><p></p><p>Hope this helped.</p><p></p><p>C</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 461009, member: 7449"] It's easy to disregard most of this and whittle it down to saying "it's just a fricken deer rifle." Thankfully that position isn't taken by engineers who design stuff most of us take for granted when flying commercial or cruising around under the arctic circle. Take it for what its worth, but this is what I learned: I'm fortunate to have some pretty smart fellers for friends. One in particular lives in the Seattle area and makes a very comfortable living designing, developing, and evaluating fasteners for aerospace and nuclear submarine applications. About 8 years ago I asked for his help on this very question. First, there isn't a "blanket answer" that covers everything. For the sake of this discussion we'll use a particular screw. 1/4-28 made from 300 series stainless. Popular now with many of the custom actions. With this particular fastener you don't exceed 40 inch pounds. Period. If you do the fastener will yield because it exceeds the tensile loading capacity of the threads and you end up only chasing problems that really don't exist. Different materials have varying degrees of lubricity, tensile strength, and surface hardness. All of which play into this. You also must take into consideration the thread pitch. This is where friction coefficients, flank surface area, and shear angles also become important. Not to mention root diameters vs major diameter and the torsional/shear loading applied to the cylinder/shaft portion of the fastener. Be that as it may if you sit and do the math the numbers are pretty close. One does not clearly outshine the other. Don't forget also that the threads in the receiver are just as capable of being influenced. A kryptonite fastener is only as effective as what its being screwed into. Excessive screw torque is attempting to mask a larger underlying problem: Poor bedding and/or incompatibility of components. If your building a spaghetti M700 in a boomer with a barrel that resembles the axle out of an excavator in a featherweight sporter stock, then its likely the gun will perform poorly no matter how much tension is put on the guard screws. Hope this helped. C [/QUOTE]
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