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Date:         Fri, 8 Jul 2011 00:37:08 -0400
Reply-To:     Kim Brennan <kimbrennan@MAC.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Kim Brennan <kimbrennan@MAC.COM>
Subject:      Re: [Friday] Bolts -- Rockwell hardness translate to grade?
Comments: To: Rocket J Squirrel <camping.elliott@GMAIL.COM>
In-Reply-To:  <1310098443.12454.65.camel@TheJackUbuntuNetbook>
Content-type: text/plain; charset=windows-1252

www.mcmaster.com

Get the right stuff. If you choose the military grade stainless, it will most likely be more than enough.

On Jul 8, 2011, at 12:14 AM, Rocket J Squirrel wrote:

> Hi all (jumping the gun a bit on that Friday thing . . . ) > > I bought a Hi Lift jack from Al "Pensioner" Knoll earlier this year. > It's a vintage piece. Very cool. > > I just went to refresh the critical parts on the jack with ones from Hi > Lift's jack rebuild kit, but the shear bolt and the climbing pins in the > kit don't fit. > > Puzzled, I contacted Hi Lift and described what I was looking at and the > fellow there said that the jack was made prior to 1960 (!) and they > don't have parts for it. > > While the original climbing pins are in good shape, the original shear > bolt is bent a bit. Needs replacing. I asked Hi Lift what grade of bolt > I could use there and the nice man wrote back to say: > > "I’ve been a couple of days trying to get you an answer, but with little > success. Our shear bolts are specially made and heat treated for us. > The Rockwell hardness scale on these bolts ranges from B85-95, with most > testing to B89-90. I’ve been trying to find out what bolt that compares > to but have failed to find any comparison." > > So I looked at some charts this morning and, if using tensile strength > is any indication, this Rockwell hardness translates to something like > 88,000 psi. Grade 2 bolts come in at around 74,000 and Grade 3 (a > rarity, I think) are more like 110,000. It's a 1/4'' bolt. > > Did I count on my fingers and toes good enough? > > The fellow went on to add that, > > "I know my dad would break his shear bolt and just stick another bolt > into it, but that is not a recommended safe practice. I wish I could > just send you a shear bolt, but we’ve checked and don’t have any laying > around after all of these years." > > Fair enough. > > So I got four choices here: re-assemble the jack and sell it on > craigslist with a caveat and buy a new jack, re-assemble this one with > the deformed shear bolt and see if it holds when I need it (not so > smart), or bang in some Grade 1 or 2 bolt* from the hardware store > (unknown degree of smartness). > > Ideas? > > ============= > * There does not seem to be any way to determine whether a bolt is Grade > 1 or 2, as neither have marks on the head. So what's my Ace Hardware > store gonna stock? It is a mystery! > > -- > Rocky J Squirrel (Jack Elliott)


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