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Tool Talk Discussion Forum

Re: fine vs course thread bolts

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55deere70

09-22-2013 15:39:00
75.138.191.254



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That's why for applications requiring high tensile strength like head and main bearing bolts, fine thread fasteners are used almost exclusively.
Really? Most head bolts and main bearing bolts I've seen are coarse thread. I don't think fine thread would last long in cast iron or aluminum.




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GVSII

09-30-2013 14:38:50
74.71.185.102



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 Re: fine vs course thread bolts in reply to 55deere70, 09-22-2013 15:39:00  
Quoting Removed, click Modern View to see
Head STUDS into the block-coarse thread. Head studs THROUGH- the head-fine thread.



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GVSII

09-30-2013 14:37:50
74.71.185.102



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 Re: fine vs course thread bolts in reply to 55deere70, 09-22-2013 15:39:00  
Quoting Removed, click Modern View to see
Head STUDS into the block-coarse thread. Head studs THROUGH the head-fine thread.



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Bob

09-22-2013 16:57:02
64.255.159.192



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 Re: fine vs course thread bolts in reply to 55deere70, 09-22-2013 15:39:00  
As an example, Cummins V8-470 and V-8 504 engines have fine- thread head bolts going into cast iron. Probably some pretty good stuff, maybe high nickel content???

Been so long since I worked on a 855 or other big Cummins I don"t remember if those bolts are course or fine.



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