Gr. 8.8 BOLTS AND NUTS

[123revolution]

Hi Guys,
I am working/preparing a piping MTO for a ship's boiler steam lines to be replaced and I'm being advised to use gr8.8 bolts for the (DIN) flanges rated 300# or PN25. Is there any advantage in using this other than using the normal grade b7?

 

[desertfox]

Hi

Grade 8.8 in comparison would be a slightly weaker bolt material see this link.

http://www.engineeredpartsinc.com/pdf/metric-conversions.pdf

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[bimr]

Grade 8.8 fasteners are metric, general purpose fasteners similar in strength to grade 5 bolts or A325s.

http://www.portlandbolt.com/technical/specifications/astm-a325/

 

[123revolution]

Thanks a lot guys.