BogMonster Posted July 17, 2006 Share Posted July 17, 2006 I have just bought some 316 stainless steel eye-bolt fixings for my boat. How would an M12 thread 316 grade stainless bolt compare in tensile strength compared to, say, mild steel stud bar and 8.8 grade high tensile bolts of the same size? I guess it will be somewhere in between but just wondered, and I am sure one of the learned engineering types on here will know the answer It probably won't matter because I suspect they will be stronger than the transom on the boat regardless, but was just curious.... just in case I ever have to tow something off them in an emergency. Ta Stephen Quote Link to comment Share on other sites More sharing options...
Jon White Posted July 17, 2006 Share Posted July 17, 2006 Bolt strengths This will give you alot of what you want! Not sure what grade stainless bolts are however. Jon Quote Link to comment Share on other sites More sharing options...
Tonk Posted July 17, 2006 Share Posted July 17, 2006 marine applications will prolly be 316 grade stainless. high tensile steel bolts are definitely stronger than stainless items, dont know any actual figures though. now to click jon's link Quote Link to comment Share on other sites More sharing options...
Bush65 Posted July 17, 2006 Share Posted July 17, 2006 ISO property class 4.6 bolts: Yield stress ~ 240 MPa minimum Tensile strength ~ 400 MPa minimum ISO property class 8.8 bolts: Yield stress ~ 640 MPa minimum (sizes M5 to M16) Tensile strength ~ 800 MPa minimum (sizes M5 to M16) I don't have properties for stainless steel bolts. The following is what I found with a quick look. 18-8 stainless steel, condition wrought, work hardened: Yield stress ~ 650 MPa Tensile strength ~ 1200 MPa I realise this does not concern your application, but for others examining the figures quoted above, I would not substitute 8.8 bolts with stainless if strength is an issue. Quote Link to comment Share on other sites More sharing options...
Astro_Al Posted July 17, 2006 Share Posted July 17, 2006 If you ever need general materials info, try matweb.com (or similar). It's got decent data on most materials. Al. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted July 18, 2006 Author Share Posted July 18, 2006 Thank somewhere towards the 8.8 strength seems likely then .... ultimate strength isn't the issue but they have to be marine stainless anyway due to being low down on the transom of a boat in salt water - anything else won't last 5 minutes - just wondered how strong they would be. The transom would probably let go first Quote Link to comment Share on other sites More sharing options...
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