Joachim: I'm with you avoid the flea market! Also avoid Lowes, Home Depot, Menards and other similar places where the pedigree of the materials is questionable---a lot of stuff from China, Taiwan & Japan in these places and thier expert service folks were flipping burgers or assembling Tacos last week and tend to look at you with blank stares like your from outer space when you ask them questions psi rating or what kind of steel they are made from and for get any understanding of threads for they will just tell you that the bolts have them. Automotive stores may understand Gr 5 or Gr 8 but have no clue as to what that means other than 8 is stronger than 5. All in all Aircraft stuff is all special although in a more populous area you may find some stuff at a store that deals in Hydraulics.
Don Joachim Saupe wrote: > Holy smoke, great standards! > Try DIN next time! > > Joachim > Fort Worth, Texas > > > [Original Message] > > From: Mark Langford <n5...@hiwaay.net> > > To: KRnet <kr...@mylist.net> > > Date: 5/7/2006 7:55:55 PM > > Subject: Re: KR> stainless bolts > > > > NetHeads, > > > > Somebody mentioned using stainless bolts for wing attach fittings the > other > > day. That may or may not be OK, but you need to do your homework first. > > Most of the stainless bolts I see in the Wicks catalog are 431, which > > depending on how it was tempered, can be anywhere between 100ksi and 150 > ksi > > tensile strength. Some stainless can approach 200 ksi, but the common > stuff > > like 304 is much weaker (like 30 ksi, weaker than 6061-T6 aluminum). > > > > Typical NAS bolts are 160ksi to 180 ksi. AN3 and AN6 bolts (what the > plans > > call for) are 125 ksi. What you have may be fine, and it may not. Just > do > > your homework for the exact material or spec that your bolts are made to, > > and make sure they're strong enough. If you got them from the bargain > bin > > at the SNF flea market, all bets are off. > > > > And even the spec number may not be good enough in some cases, as some > bolts > > can be had in either carbon steel or stainless, with the only difference > > being a dash and a letter at the end of the part number! > > > > Stainless bolts are something like 1% heavier than carbon steel bolts, > so > > weight is certainly not a good reason to swap them out. > > > > I'm with Larry though... replace 'em every 10 years if it worries you. > > You'll take the wings off every few years anyway... > > > > Mark Langford, Huntsville, Alabama > > see KR2S project N56ML at http://home.hiwaay.net/~langford > > email to N56ML "at" hiwaay.net > > > > > > _______________________________________ > > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > > please see other KRnet info at http://www.krnet.org/info.html > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
