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Carbon Fibre (Peek) Screws for Stantions, etc.
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bud717
#1 Posted : Thursday, August 27, 2009 4:38:04 PM(UTC)
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Has anyone tried these Carbon Fibre (Peek) Screws for Stantions, etc.

Here's a link to buy Craftech Peek Screws:

http://www.smallparts.co...terial_browse=160492011

They are expensive, and appear to be experimental, but I'm wondering if anyone has tried them, found a good source, if they are strong enough, and if we can use them in self tapping type applications.

I'm not sure, but if this were the solution, probably this group could make a bulk buy to reduce the cost.

Any thoughts?

Bud
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fastjeff
#2 Posted : Thursday, August 27, 2009 10:53:16 PM(UTC)
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Interesting. I wonder what tensile stength they have? You'd need sheet metal screw type threads on them, however, for a direct replacement.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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dougrose
#3 Posted : Friday, August 28, 2009 12:40:35 AM(UTC)
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PEEK has a tensile strength of around 92 MPa, and a modulus of elasticity of 3.7 GPa.

316 stainless steel has a tensile strength of around 500 MPa, and a modulus of elasticity of 193 GPa.

You would need more than twice the diameter of fastener to get the same strength with PEEK as with 316 ss, but even worse, the structure wouldn't feel as strong, since PEEK stretches a lot more.

I think these would be a poor replacement for stantions, where strength and stiffness are essential. For less demanding applications, perhaps they would be just fine. Not worrying about electrolysis is a big plus for plastic.

I won't mention price, since Jeff is reading this and I don't want to ruin his digestion for the next month.....


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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fastjeff
#4 Posted : Friday, August 28, 2009 12:34:03 PM(UTC)
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Thanks, good buddy!

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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