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RE: grade 3.6, 4.6, 4.8, ..., means.

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this is a strenght grade designation in accordance with ISO/R 898/1 for 
bolts defined in British Standards, Eurocode 3 and many other Standards 
used in Europe.  The first figure is the minimum tensile strenght fub/100 
MPa and the second figure is 10 times the ratio between the minimum yield 
fyb and minimum tensile strenght fub,

i.e. for grade 4.6 then fub=4*100=400 MPa and fyb=400*0.6=240 MPa
and for grade 8.8 then fub=8*100=800 MPa and fyb=800*0.8=640 MPa
and for grade 10.9 then fub=10*100=1000 MPa and fyb=800*0.9=900 MPa.

1 MPa = 1 megapascal = 1 N/mm2 =145 psi

Grades in Eurocode 3 are 4.6,  5.6,  8.8 and 10.9.  The higher grades are 
used for high-strenght friction-grip bolts.  The grade is usualy stamped on 
the head of the bolt.

Einar Einarsson CE
E-mail:   mailto:byggtak(--nospam--at)

-----Original Message-----
From:	Alberto Guida [SMTP:GRUPOCG(--nospam--at)]
Sent:	11. mars 1999 05:45
To:	Seaint
Subject:	RV:

>I am using a british program for steel design. I don´t know what   grade 
3.6, 4.6, 4.8, ..., means.
These grades are used for bolts.
>Somebody knows what this means?

>Thank you very much

>Alberto Guida
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