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Re: Exhaust manifold bolt clarification (2nd email)

To: triumphs@autox.team.net
Subject: Re: Exhaust manifold bolt clarification (2nd email)
From: corey.sherman@rcn.com
Date: Mon, 25 Mar 2002 21:04:32 -0500 18, 2001) at 03/25/2002 09:04:36 PM, Serialize complete at 03/25/2002 09:04:36 PM
IMHO, I would NOT replace the bolts with stainless steel ("SS"). While 
some SS bolts may look nice and have an "anti-rust" appeal, there is one 
major drawback that one must consider when replacing a bolt... strength!

Stainless is a series of alloy steels which contain at least 12% chromium. 
Such steels will not rust when exposed to weather. The most common 
stainless steel is 304 which is an 18-8 alloy containing at least 18% chromium 
and 8% nickel. 304 is a non magnetic steel. The metric 
designation for 304 is A-2. Even more corrosion resistant alloys, such as 
316, are available for high corrosion environments such as marine use.

Because stainless steel is softer than other steels (it only seems harder 
because it work-hardens) it tends to gall or wear prematurely. Overall, SS 
bolt are rated Grade 2, sometimes 5, while SAE stardand is grade 8. When 
it comes to the engine compartment... items subject to considerable heat 
and vibration - use SAE 8.

Check out http://www.waukeshafoundry.com/antigall.htm for a picture. 

A remember to always use anti-Seize or a similar product on the threads 
;-)

________________________
Corey Sherman 
corey.sherman@rcn.com

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