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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
6x48 vs. 8x40 base screws
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<blockquote data-quote="Wedgy" data-source="post: 1211998" data-attributes="member: 64108"><p>While I have never had any of my #6 screws fail I have seen it 4 times and have been changing some of mine over, starting with the big guns while I have them apart. It is a very simple task and inexpensive. The threads are the same size which is fine, I have only seen shearing failures, never pulled out, but the screw diameter of the #8 has about 30% more surface area Area of circle = R squared x Pi</p><p>#6 = ~0.134" diameter = 0.014</p><p>#8 = ~0.153" diameter = 0.018 sq in or roughly 30% more material</p><p>(check my math)</p><p> </p><p>If there were never failures I don't think there would be things like integral rails and pinned rails. Any rail should be bedded as well.</p><p>The ATACR I'm mounting on a 300 RUM is 19" long and the turrets are 3 1/3" wide so bumping the end of that thing can generate a lot of leverage. Odds are you will never have one break but unplanned things happen. I've never planned a fall or someone dumping a suitcase on top of my gun in the back of the car.</p><p> </p><p>What's the weakest link in your system ? </p><p>Fix that first.</p><p> </p><p><u><a href="http://www.ebay.com/itm/121989542850" target="_blank">Gunsmith Thread Size Gauge Jig Can Hold Screws for Grinding to A Shorter Length | eBay</a></u></p><p> </p><p><u><a href="http://www.ebay.com/itm/121989542850" target="_blank">Gunsmith Thread Size Gauge Jig Can Hold Screws for Grinding to A Shorter Length | eBay</a></u></p><p> </p><p><u><a href="http://www.ebay.com/itm/8-40-CARBON-STEEL-BOTTOM-Tap-Right-Hand-And-28-Drill-/222127717680?hash=item33b7d7fd30:g:cWoAAOSwKtlWrCOz" target="_blank">8 40 Carbon Steel Bottom Tap Right Hand and 28 Drill | eBay</a></u></p></blockquote><p></p>
[QUOTE="Wedgy, post: 1211998, member: 64108"] While I have never had any of my #6 screws fail I have seen it 4 times and have been changing some of mine over, starting with the big guns while I have them apart. It is a very simple task and inexpensive. The threads are the same size which is fine, I have only seen shearing failures, never pulled out, but the screw diameter of the #8 has about 30% more surface area Area of circle = R squared x Pi #6 = ~0.134" diameter = 0.014 #8 = ~0.153" diameter = 0.018 sq in or roughly 30% more material (check my math) If there were never failures I don't think there would be things like integral rails and pinned rails. Any rail should be bedded as well. The ATACR I'm mounting on a 300 RUM is 19" long and the turrets are 3 1/3" wide so bumping the end of that thing can generate a lot of leverage. Odds are you will never have one break but unplanned things happen. I've never planned a fall or someone dumping a suitcase on top of my gun in the back of the car. What's the weakest link in your system ? Fix that first. [U][URL="http://www.ebay.com/itm/121989542850"]Gunsmith Thread Size Gauge Jig Can Hold Screws for Grinding to A Shorter Length | eBay[/URL][/U] [U][URL="http://www.ebay.com/itm/121989542850"]Gunsmith Thread Size Gauge Jig Can Hold Screws for Grinding to A Shorter Length | eBay[/URL][/U] [U][URL="http://www.ebay.com/itm/8-40-CARBON-STEEL-BOTTOM-Tap-Right-Hand-And-28-Drill-/222127717680?hash=item33b7d7fd30:g:cWoAAOSwKtlWrCOz"]8 40 Carbon Steel Bottom Tap Right Hand and 28 Drill | eBay[/URL][/U] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
6x48 vs. 8x40 base screws
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