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Replace soft fasteners? (Read 110 times)

DrunkenDwarf Senior Member Offline Morning Zombie Posts: 325 Seattle, WA Gender:	Replace soft fasteners? 06/02/09 at 09:24:23 I often see people suggest replacing the stock bolts and nuts because they are too "soft". How hard should their replacements be? Grade 5? Grade 8? other? -D. Dwarf
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Joshua YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 33	Re: Replace soft fasteners? Reply #1 - 06/02/09 at 09:51:08 I would say that if the price isn't too high I would go as hard as possible. I replaced some of the philips head screws with hex head bolts for obvious reasons.
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T Mack 1 - FSO

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Re: Replace soft fasteners?
Reply #2 - 06/02/09 at 09:54:46

A lot of people do not like the screws. Someone here explained that the screws are a Japanese version of the philips head. Not exactly the same and thus the stripping problems.

Depending on what you're replacing , a grade 5 should do. I'm not sure how the metric bolts show that. On the SAE bolts, there are three lines on the head.

I have been using stainless steel many places.

Engineers design things, Technicians make them work.
---
30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck Wink

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Charon Serious Thumper Offline Posts: 1811 Harvard, NE Gender:	Re: Replace soft fasteners? Reply #3 - 06/02/09 at 10:24:37 Which do you prefer? A screw or bolt that breaks off if you tighten it too much, or one that strips out the aluminum hole into which it is threaded? The answer to that will tell you how strong your replacement bolt should be.
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Re: Replace soft fasteners?
Reply #4 - 06/04/09 at 18:05:11

Heh-heh Charon... the other day I was browsing Wikipedia to look up types of bolts and got to the subject "Fasteners", the article stated essentially the same thing you did.

Q: Which do you want to break/snap/fail first, the fastener, or the component/fixture being fastened to?

I guess that was their unstated explanation for why some fasteners are intentionally softer/more likely to fail than we'd prefer. Sad

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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: Replace soft fasteners? Reply #5 - 06/04/09 at 19:22:55 The soft screws and bolts don't vibrate lose as easy either.
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PTRider Senior Member Offline Posts: 397	Re: Replace soft fasteners? Reply #6 - 06/05/09 at 07:10:09 Fastener grades 5 & 8 aren't metric. Metric fastener grades are (in increasing strength) Class 4.6, 5.8, 8.8, & 10.9. Look at the bottom of this chart http://www.americanfastener.com/technical/grade_markings_steel.asp
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