Where have people sourced High Tensile nuts from? I need some M6, M8 and M10 high tensile nuts.... Or do I not need to use HT nuts when using HT screws and bolts!

Dave B

as long as the bolt is 8.8 youll be fine

also some bolts have a linear mark on

3 lines these are equivalent l
/

that kind of thing

hth chris

I'll call them tomorrow....thanks

I can get the HT bolts no problem but the nuts are not so easy!

thanks
Dave B

do you really need HT nuts too? please let it not be the case as i have already welded some nuts in the car...

The nuts will have a mark on for HT, for metric it will be a n "8" stamp on them (as far as I can remeber). The problem comes when you need anything more than needed for an 8.8 bolt getting the nuts is a little harder.

Dan

[Edited on 19/11/07 by Bluemoon]

[Edited on 19/11/07 by Bluemoon]

you don't need HT nuts as the reason for HT bolts is the radial force and HT nuts are only needed on points where axial force is coming into play (high torque connection)

So on suspension the nuts are only used for keeping the bolt in place.

And there's no 8.8 or grade 8 nuts, take a look here:
http://www.americanfastener.com/technical/grade_markings_steel.asp

[Edited on 19/11/07 by Werner Van Loock]

My nuts have an 8 stamped on them.

I can't believe I just said that

metric bolts have grades: 4.6, 8.8, 10.9, 12.9 (and others but those are the common ones)

the first number is the min tensile strength (4 = 400 N/mm^2 tensile strength, 8 = 800 N/mm^2 and so on)

the second number is the ratio of yield strength to min tesile strength - the higher the number the harder the bolt and the less it will deform before failing (in other words, the higher the second number the more britle the bolt is, but the more load it can take before deforming for the same tesnsile strenght)

and you get nuts to match, grades: 4, 8, 10, 12

most bolts you get are 8.8 and most nuts are grade 8 (but not all) and its normally best to use nuts of the same strength

if you need to tap a nut oversized for a thick coating - like hot dip galv. then you use 1 grade higher than normal. (i.e. grade 10 nut for an 8.8 bolt when galv'd)

but its also worth adding that is you weld a high tensile bolt you affect its heat treatment and therefore weaken it (this can be a small affect on and 8.8/ 8 as long as they don't get too hot, but will seriously weaken higher grades - unless you can re-heat treat them)

quote:

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Originally posted by Macbeast
My nuts have an 8 stamped on them.

I can't believe I just said that

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